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1. Bit Name Function 15 5 Reserved Read returns zero 4 COMP 0 Disables compression PCM mode 1 Enables linear compression 3 1 Reserved Read returns zero 0 PRT 0 Disables PCM mode 1 Enables PCM mode U76 GEN1 Bit D15 D14 013 D12 D11 D10 D9 D8 D7 D6 05 D4 D3 D2 D1 DO Name OHSR 6 0 FACL DCL 2 0 ACL 4 0 Type R W R W R W Reset settings 0x3240 Bit Name Function 15 9 OHSR 6 0 Off Hook Sample Rate 40 ms units Sets the sample rate for the off hook intrusion algorithms 1 second default 8 FACL Force ACL 0 While off hook ACL is automatically updated with LVCS 1 While off hook ACL does not change from the value written to it while on hook 7 5 DCL 2 0 Differential Current Level 3 mA units Sets the differential level between ACL and LVCS that will trigger an off hook PPD interrupt default 2 4 0 ACL 4 0 Absolute Current Level 3 mA units ACL represents the value of current when the ISOmodem0 is off hook and all parallel phones are on hook If ACL 0 it is ignored by the off hook intrusion algorithm The ISOmo dem will also write ACL with the contents of LVCS before an intrusion and before going on hook default 0 e Rev 1 0 57 SILICON LABORATORIES i2457 34 15 04 U77 GEN2 Bit D15 D14 013 D12 D11 010 07 D6 D5 D3 02 D1 DO Name IST 3 0 HOI AOC O
2. T TT su o DI tw yr 190 cw zasa OQ LNI 2 19g sd 1 m II ANI LNOV Se lu Q os3 if px EE vaiaoa 4 suorssrus e Ss ee 27 T 55 uorido oo D 1 5 in ee Been es ES ee ce ee ele EC ERES 4 uoneouqej god uonoes VVC eue d ON oso 20 5461 uooiliS 0 jno e gepak Joy xipueddy Joe 71959 59 510 K IS 548 ONT sodarinow1o za asaa bar ta 0Q LNI ANI LNOV ea osa va _aoa 11 Rev 1 0 SILICON LABORATORIES i2457 34 15 04 3 Bill of Materials Si2457 34 15 04 Chipset Component Value Supplier s C1 C2 33 pF Y2 X7R 20 Panasonic Murata Vishay C3 10 nF 250 V X7R 20 Venkel SMEC C4 1 0 uF 50 V Elec Tant 20 Panasonic C5 C6 C50 C52 0 1 pF 16 V X7R 20 Venkel SMEC C7 2 7 nF 50 V X7R 20 Venkel SMEC C8 C9 680 pF Y2 X7R 10 Panasonic Murata Vishay C10 0 01 uF 16 V X7R 20 Venkel SMEC C40 C41 33 pF 16 V NPO 5 Venkel SMEC
3. Numeric Meaning Verbal Response X0 X1 X2 X3 X4 X5 43 Telephone line is in use LINE IN USE enabled via X X X X X X Vn commands 44 A polarity reversal was POLARITY REVERSAL X X X X X X detected enabled via G modifier 45 A polarity reversal was NOT NO POLARITY REVERSAL X X X X X X detected enabled via G modifier 52 Link established at 56000 CONNECT 560004 X X X X X 60 Link established at 32000 CONNECT 32000 X X X X X 61 Link established at 48000 CONNECT 480004 X X X X X 63 Link established at 28000 CONNECT 280004 X X X X X 64 Link established at 29333 CONNECT 293334 X X X X X 65 Link established at 30666 CONNECT 30666 X X X X X 66 Link established at 33333 CONNECT 333334 X X X X X 67 Link established at 34666 CONNECT 34666 X X X X X 68 Link established at 36000 CONNECT 360004 X X X X X 69 Link established at 37333 CONNECT 373334 X X X X X 70 No protocol PROTOCOL NONE Set with WO command 75 Link established at 75 CONNECT 75 X X X X X 77 V 42 protocol PROTOCOL V42 Set with command 79 V 42bis protocol PROTOCOL V42bis Set with command 80 MNP2 protocol PROTOCOL Set with V command ALTERNATE CLASS 2 81 MNP3 protocol PROTOCOL Set with V command ALTERNATE CLASS 3 82 MNP4 protocol PROTOCOL Set with V command ALTERNATE CLASS 4 83 MNP5 protocol PROTOCOL X X X X X ALTERNATE CLASS 5 90 Link established at 38666 CONNECT 38666 X X X X
4. NE Ex Ra Ree ee Ne 74 Rev 1 0 3 SILICON LABORATORIES i2457 34 15 04 1 Electrical Specifications Table 1 Recommended Operating Conditions Test Condition Parameter Ambient Temperature F Grade 2457 34 15 04 Supply Voltage Digital Notes The Si2457 34 15 04 specifications are guaranteed when the typical application circuit including component tolerance and any Si2457 34 15 04 and any Si3018 are used See 2 Typical Application Schematic on page 10 All minimum and maximum specifications are guaranteed and apply across the recommended operating conditions Typical values apply at nominal supply voltages and an operating temperature of 25 C unless otherwise stated The digital supply Vp operates from 3 0 to 3 6 V The Si2457 34 15 04 interface supports 5 V logic CLKIN XTALI supports 3 3 V logic only Table 2 Loop Characteristics 3 0 to 3 6 V 0 to 70 C for F Grade Test Condition 20 mA ILIM 0 DCV 00 MINI 11 DCR 0 120 mA ILIM 0 DCV 00 MINI 11 DCR 0 20 mA 0 DCV 11 MINI 00 DCR 0 120 mA ILIM 0 DCV 11 MINI 00 DCR 0 20 mA ILIM 1 DCV 11 MINI 00 DCR 0 60 mA ILIM 1 DCV 11 MINI 00 DCR 0 50 mA ILIM 1 DCV 11 MINI 00 DCR 0 Parameter DC Termination Voltage DC Termination Voltage DC Termination Voltage
5. amp 22 Rev 1 0 e SILICON LABORATORIES i2457 34 15 04 Table 10 Basic AT Command Set Command Defaults in Bold Continued Command Action Xn Call Progress Monitor CPM This command controls which CPM signals are monitored and reported to the host from the Si2457 34 15 04 See Table 14 on page 36 Basic results disable CPM Blind dial does not wait for dial tone CONNECT message does not include speed X1 Extended results disable CPM Blind dial CONNECT message includes speed x2 Extended results and detect dial tone only Add dial tone detection to X1 mode Does not blind dial Extended results and detect busy only Add busy tone detection to X1 mode XA Extended results full CPM Full CPM enabled CONNECT message includes speed X5 Extended results Full CPM enabled including ringback detection Adds ringback detection to X4 mode Yn Long space disconnect Modem hangs up after 1 5 seconds or more of continuous space while on line YO Disable Y1 Enable Z Hard Reset This command is functionally equivalent to pulsing the RESET pin low See tar in Table 6 on page 7 E Read from serial EEPROM 1 Interrupt Read This command causes the ISOmodem to report the lower 8 bits of the interrupt register I O Control 0 070 CID OCD PPD and RI bits also are cleared and the INT pin INT bit in parallel mode is
6. Le JA NS kr n See Detail F Seating Plane Il Approximate device weight is 152 mg Figure 10 16 pin Small Outline Integrated Circuit SOIC Package Table 20 Package Diagram Dimensions Millimeters Symbol Min Max A 1 35 1 75 A1 10 25 B 33 51 C 19 25 D 9 80 10 00 E 3 80 4 00 e 1 27 BSC H 5 80 6 20 h 25 50 L 40 1 27 0 10 0 0 8 aaa 0 25 bbb 0 25 72 Rev 1 0 s SILICON LABORATORIES i2457 34 15 04 DOCUMENT CHANGE LIST Revision 0 91 to Revision 1 0 Added Figure 5 typical schematic with 16 pin system side option Updated Table 3 to include 16 pin system side parameters Updated default register setting in Table 16 Added Si2404 information Added 16 pin system side option Updated 4 Functional Description on page 16 Added 8 Pin Descriptions Si2457 34 15 04 16 Pin Option on page 66 Updated 11 Ordering Guide on page 70 to reflect part revision 6 gt Rev 1 0 SILICON LABORATORIES 73 i2457 34 15 04 CONTACT INFORMATION Silicon Laboratories Inc 4635 Boston Lane Austin TX 78735 Tel 1 512 416 8500 Fax 1 512 416 9669 Toll Free 1 877 444 3032 Email ISOinfo gsilabs com Internet www silabs com The information in this document is believed to be accurate in all respects at the time of publication but is subject to change without notice Silicon Lab
7. 9 10 or 11 bits per character Notes 1 Supported on Si2457 only 2 Supported on Si2457 and Si2434 only 3 Supported on Si2457 Si2434 and Si2415 only SILICON LABORATORIES Rev 1 0 13 i2457 34 15 04 Table 7 Protocol Characteristics Continued Item Specification Compatibility ITU T V 901 V 34 V 32bis V 32 V 23 V 22bis V 22 V 21 Bell 212A and Bell 103 Operating Mode Switched network Two wire full duplex Data Modulation 28 to 56 kbps 2 4 to 33 6 kbps 14 4 kbps 12 0 kbps 9600 bps 9600 bps 9600 bps 7200 bps 4800 bps 2400 bps 1200 bps 0 to 300 bps V 90 as specified by ITU T V 34 as specified by ITU T 128 level TCM 2400 Baud 0 01 64 level TCM 2400 Baud 0 01 32 level TCM 2400 Baud 0 01 16 level QAM 2400 Baud 0 01 V 29 QAM as specified by ITU T 16 level TCM 2400 Baud 0 01 4 level QAM 2400 Baud 0 01 16 level QAM 600 Baud 0 01 4 level PSK 600 Baud 0 0196 FSK 0 300 Baud x0 0196 Answer Tone ITU T V 32bis V 32 V 22bis V 22 and V 21 modes Bell 212A and 103 modes 2100 Hz 3 Hz 2225 Hz 3 Hz Transmit Carrier v 901 V 34 ITU T V 32bis ITU T 323 ITU T V 29 ITU T V 22 V 22bis Bell 212A Originate mode Answer mode ITU T V 21 Originate mode Answer mode Bell 103 Originate mode Answer mode As specified by ITU T As specified by ITU T 1800 Hz 0 01 1800 Hz 0 01 1700 Hz 1 Hz 1200 Hz 0 5 H
8. C51 C53 0 22 uF 16 V X7R 20 Venkel SMEC D1 D2 Dual Diode 225 mA 300 V CMPD2004S Central Semiconductor FB1 FB2 Ferrite Bead BLM21AG601SN1 Murata Q1 Q3 NPN 300 V MMBTA42 OnSemi Fairchild Q2 PNP 300 V MMBTA92 OnSemi Fairchild Q4 Q5 NPN 80 V 330 mW OnSemi Fairchild RV1 Sidactor 275 V 100 A Teccor Protek ST Micro R1 1 07 kQ 1 2 W 1 Venkel SMEC Panasonic R2 150 Q 1 16 W 5 Venkel SMEC Panasonic R3 3 65 kO 1 2 W 196 Venkel SMEC Panasonic R4 2 49 kO 1 2 W 196 Venkel SMEC Panasonic R5 R6 100 kQ 1 16 W 5 Venkel SMEC Panasonic R8 20 MQ 1 16 W 5 Venkel SMEC Panasonic R9 1 MQ 1 16 W 1 Venkel SMEC Panasonic R10 536 O 1 4 W 196 Venkel SMEC Panasonic R11 73 2 0 1 2 W 1 Venkel SMEC Panasonic R12 R13 56 Q 1 16 W 1 Venkel SMEC Panasonic R15 R164 00 1 16 W Venkel SMEC Panasonic U1 Si2457 34 15 04 Silicon Labs U2 Si3018 10 Silicon Labs 125 4 9152 MHz 20 pF 100 ppm 150 ESR ECS Inc Siward Z1 Zener Diode 43 V 1 2 W BZT84C43 On Semi 1 C52 and C53 should not be populated with the Si2457 34 15 04 16 pin package option 2 In STB applications C40 C41 and Y1 can be removed by using the 27 MHz clock input feature 3 Several diode bridge configurations are acceptable For example a single DF04S or four 1N4004 diodes may be used 4 Murata BLM21AG601SN1 may be substituted for R15 R16 0 to decrease emissions 5 To ensure complianc
9. POLARITY REVERSAL if a polarity reversal was detected or NO POLARITY REVERSAL if a polarity reversal was not detected In each case the result code is followed by If the S7 timeout occurs before a busy tone is detected the Si2457 34 15 04 will report NO CARRIER Polarity reversal monitoring begins after the last digit is dialed and ends when the busy tone is detected or S7 timeout occurs Note It is not possible to establish a modem connection when using this command Redial last number P Pulse rotary dialing pulse digits 0 1 2 3 4 5 6 7 8 9 T Tone DTMF dialing DTMF digits A B C D 0 1 2 3 4 5 6 7 8 9 W Wait for dial tone before continuing for 514 seconds default 12 seconds Blind dialing modes XO X1 and X3 do not affect the W command If the DOP bit U7A bit 7 is set the ATDTW com mand will cause the ISOmodem Q to pause dialing and either report an if a dialtone is detected or NO DIALTONE if a dial tone is not detected En Local DTE echo EO Disable E1 Enable Hook switch HO Go on hook hang up modem amp s Rev 1 0 21 SILICON LABORATORIES i2457 34 15 04 Table 10 Basic AT Command Set Command Defaults in Bold Continued Command Action H1 Go off hook
10. SILICON LABORATORIES i2457 34 15 04 Table 15 S Register Description Continued Definition S Register Decimal Function Default Decimal Range Units 42 Blacklisting The 512457 34 15 04 will not dial the same number more than two times in three minutes An attempt to dial a third time within three minutes will result in a BLACKLISTED result code If the blacklist memory is full any dial to a new number will result in a BLACKLIST FULL result code Numbers are added to the blacklist only if the modem connection fails The B command will list the numbers on the blacklists 0 disabled 1 enabled 0 disabled 0 1 43 Dial Attempts to Blacklist When blacklisting is enabled with S42 this value con trols the number of dial attempts that will result in a number being blacklisted 0 4 44 Blacklist Timer Period during which blacklisting is active 180 0 255 seconds 50 Minimum on hook time Modem will remain on hook for S50 seconds Any attempt to go off hook will be delayed until this timer expires 0 255 seconds 51 Number to start checking for an outside line on a PBX See amp X command for details 0 9 Rev 1 0 SILICON LABORATORIES 41 i2457 34 15 04 6 User Access Registers U Registers The U AT command is used to write these 16 bit U registers and the R command is used to read them U
11. X Class 1 Transmit Carrier for V 29 fast connect X Mode 2 Transmit V 21 980 Hz tone 53 Same as amp T4 but transmit V 29 7200 bps Data pattern set by S40 register AT FCLASS 0 must be sent to restore the ISOmodem to normal operation after test 54 Same as amp T4 but transmit V 29 9600 bps Data pattern set by S40 register AT FCLASS 0 must be sent to restore the ISOmodem to normal operation after test 95 V 29 short synchronous 96 V 29 full synchronous Rev 1 0 25 SILICON LABORATORIES i2457 34 15 04 Table 10 Basic AT Command Set Command Defaults in Bold Continued Command Action GCl X Country settings Automatically configure all registers for a particular country X Country 0 Japan 9 Australia A Austria F Belgium 16 Brazil 1B Bulgaria 20 Canada 26 China 27 Columbia 2b Czech Republic 31 Denmark 35 Ecuador 3C Finland 3D France 42 Germany 46 Greece 50 Hong Kong 51 Hungary 53 India 57 Ireland 58 Israel 59 Italy 61 South Korea 69 Luxembourg 6C Malaysia 73 Mexico 7B Netherlands New Zealand 82 Norway 87 Paraguay 89 Philippines 8A Poland 8B Portugal 9C Singapore 9F South Africa AO Spain A5 Sweden A6 Switzerland B8 Russia B4 United Kingdom B5 United States FE Taiwan Note U registers are configured to Silicon Laboratories recommended values command resets the U registers and the S7 and S6 S registers to default values be
12. exclude protocol message WA Report connect and protocol message with both upstream and downstream connect rates Notes 1 When in autobaud mode 180 181 and P1 will not be detected automatically The combination of B2 and P3 will be detected This is compatible with seven data bits no parity two stop bits Seven data bits no parity one stop bit may be forced by sending AT T17 B1 2 The autobaud feature does not detect this rate 6 gt Rev 1 0 35 SILICON LABORATORIES i2457 34 15 04 Table 14 Result Codes Numeric Meaning Verbal Response X0 X1 X2 X3 X4 X5 0 Command was successful OK X X X X X X 1 Link established at 300 bps CONNECT X X X or higher 2 Incoming ring detected RING X X X X X X 3 Link dropped NO CARRIER X X X X X X 4 Command failed ERROR X X X X X X 5 Link establish at 1200 CONNECT 1200 X X X X X 6 Dial tone not present NO DIALTONE X X X 7 Line busy BUSY X X X 8 Remote not answering NO ANSWER X X X X X X 9 Ringback detected RINGING X 10 Link established at 2400 CONNECT 2400 X X X X X 11 Link established at 4800 CONNECT 4800 X X X X X 12 Link established at 9600 CONNECT 9600 X X X X X 14 Link established at 19200 CONNECT 19200 X X X X X 15 Link established at 7200 CONNECT 7200 X X X X X 16 Link established at 12000 CONNECT 12000 X
13. 15 04 U6A ITC4 Bit D15 014 013 012 D11 D10 09 D7 05 D4 D3 D2 D1 DO Name OVL Type R Reset settings N A Bit Name Function 15 3 Reserved Read returns zero 2 OVL Overload Detected This bit has the same function as ROV but clears itself after the overload has been removed See the Billing Tone Detection section in AN93 Modem Designer s Guide This bit is not affected by the BTE bit 1 0 Reserved Do not modify U6C LVS Bit D15 D14 013 012 D11 010 09 D7 D6 D5 D4 D3 D2 D1 DO Name LVS 7 0 Type R Reset settings OxXX40 Bit Name Function 15 8 LVS 7 0 Line Voltage Status Eight bit signed twos complement number representing the tip ring voltage Each bit repre sents 1 V Polarity of the voltage is represented by the MSB sign bit 0000 0000 Measured voltage is lt 3 V 7 0 Reserved Read returns zero 54 Rev 1 0 s SILICON LABORATORIES i2457 34 15 04 U6E CK1 Bit D15 014 013 012 D11 010 D7 D6 05 D4
14. 6 kbps max amp G13 24 kbps max amp G14 26 4 kbps max amp G15 28 8 kbps max amp G16 31 2 kbps max amp G17 33 6 kbps max default for 512457 and 512434 amp Hn Switched network handshake mode amp Hn commands must be on a separate command line from ATD ATA or ATO commands amp HO V 90 with automatic fallback 56 kbps to 300 bps default for Si2457 amp H1 V 90 only 56 kbps to 28 kbps amp H2 V 34 with automatic fallback 33 6 kbps to 300 bps default for Si2434 amp H3 V 34 only 33 6 kbps to 2400 bps e Rev 1 0 29 SILICON LABORATORIES i2457 34 15 04 Table 11 Extended AT amp Command Set Command Defaults in Bold Continued Command Action amp H4 ITU T V 32bis with automatic fallback 14 4 kbps to 300 bps default for Si2415 amp H5 ITU T V 32bis only 14 4 kbps to 4800 bps amp H6 ITU T V 22bis only 2400 bps or 1200 bps amp H7 ITU T V 22 only 1200 bps amp H8 Bell 212 only 1200 bps amp H9 Bell 103 only 300 bps amp H10 ITU T V 21 only 300 bps amp H11 V 23 1200 75 bps amp Pn Japan pulse dialing amp PO Configure Si2457 34 15 04 for 10 pulse per second pulse dialing For Japan amp P1 Configure Si2457 34 15 04 for 20 pulse per second pulse dialing For Japan amp Tn Test mode amp TO Cancel test mode Escape to command mode to issue AT amp TO This command will also report
15. DC Termination Voltage DC Termination Voltage DC Termination Voltage DC Termination Voltage On Hook Leakage Current 48 V Operating Loop Current MINI 00 ILIM 0 Operating Loop Current MINI 00 ILIM 1 DC Ring Current DC current flowing through ring detection circuitry Ring Detect Voltage RT 0 Ring Detect Voltage VRD RT 1 Ring Frequency FR Ringer Equivalence Number Notes 1 ILIM 067 bit 9 DCV U67 bits 3 2 MINI U67 bits 13 12 DCR 067 bit 7 RT 067 bit 0 2 The ring signal is guaranteed to not be detected below the minimum The ring signal is guaranteed to be detected above the maximum Rev 1 0 SILICON LABORATORIES i2457 34 15 04 TIP 6000 gt Si3018 Vig li 10uF RING Figure 1 Test Circuit for Loop Characteristics Table 3 DC Characteristics Vp 3 0 to 3 6 V Vp 3 0 to 3 6 V T4 0 to 70 C for F Grade Parameter Test Condition High Level Input Voltage Low Level Input Voltage High Level Output Voltage Low Level Output Voltage Input Leakage Current Pullup Resistance Pins 3 4 9 11 50 15 16 17 18 23 24 24 pin option Pullup Resistance Pins 3 5 7 9 11 50 15 16 16 pin option Total Supply Current Vp3 3 26 35 Total Supply Current Powerd
16. OCD PPD RI DCD 071 101 COMP PRT U76 GEN1 OHSR 7 0 FACL DCL 2 0 0 077 GEN2 IST 3 0 HOI AOC OHT 8 0 U78 GEN3 IB 1 0 IS 7 0 U79 GEN4 LVCSI4 0 U7A GENA DOP ADD V22HD HDLC FAST U7C GENC RIGPO RIG POEN U7D GEND NLM ATZD FDP U87 SAM MINT SERM FSMS XMTT UAA V29MODE V29ENA s Rev 1 0 47 SILICON LABORATORIES i2457 34 15 04 6 1 Bit Mapped U Register Detail defaults in bold U4D MOD1 Bit D15 014 D13 012 011 D10 D8 D7 D6 05 D4 D3 D2 D1 DO Name TOCT NHFP NHFD CLPD FTP SPDM GT18 GT55 CTE Type R W RW RW RW RW RW R W R W R W Reset settings 0x0000 Bit Name Function 15 Reserved Read returns zero 14 Turn Off Calling Tone 0 Disable 1 Enable 13 Reserved Read returns zero 12 NHFP No Hook Flash Pulse 0 Disable 1 Enable 11 NHFD No Hook Flash Dial 0 Disable 1 Enable 10 CLPD Check Loop Current Before Dialing 0 Ignore 1 Check Reserved Read returns zero 8 FTP Force Tone or Pulse 0 Disable 1 Enable 7 SPDM Skip Pulse Dial Modifier 0 No 1 Yes 6 Reserved Read returns zero 5 GT18 1800 Hz Guard Tone Enable 0 Disable 1 Enable 4 GT55 550 Hz Guard Tone Enable 0 Disable 1 Enable 3 CTE Calling Tone Enable 0 Disable 1 Enable 2 0 Reserved Read returns zero 4
17. RESET pin 4 8 Data Compression The modem can achieve DTE host to ISOmodem speeds greater than the maximum DCE modem to modem speed through the use of a data compression protocol The compression protocols available are the ITU T V 42bis and MNP5 protocols Data compression attempts to increase throughput by compressing the data before actually sending it Thus the modem is able to transmit more data in a given period of time 4 9 Error Correction The 512457 34 15 04 SOmodem can employ error correction reliable protocols to ensure error free delivery of asynchronous data sent between the host and the remote end The Si2457 34 15 04 supports V 42 SILICON LABORATORIES Rev 1 0 17 i2457 34 15 04 and MNP2 4 error correction protocols V 42 LAPM is most commonly used and is enabled by default 4 10 Wire Mode Wire mode is used to communicate with standard non error correcting modems When optioned with N3 the Si2457 34 15 04 falls back to wire mode if it fails in an attempt to negotiate a V 42 link with the remote modem Error correction and data compression are not active in wire mode 4 11 Caller ID Operation The Si2457 34 15 04 supports full type and type Il caller ID detection and decode Caller ID is supported for the US Bellcore European ETSI UK and Japanese protocols and is enabled via the VCID VCDT and PCW commands 4 12 Parallel Phone Detection The ISOmodem is able to det
18. RR HOD 19 4 14 Global Operatlofi z dbi hu es Ee bbs Jeder ae Ros DE od 19 4 15 Firmware Upgrades okt ale e px b wha ta tei bus 19 4 16 SMS MMS SUDDOLl c Enc E we EE 19 4 17 Codec Interface 24 Pin Version Only 19 4 18 EEPROM Interface 24 Pin Version Only 20 Zi IS AT Commands qium Sr pce qa Sean Ra RT CLR RU UP e eate MARG feci ce 20 4 20 Extended AT Commands 3 253 a weed e rA aua en Won ae 29 9 S REGISTErS EE d E E E 39 6 User Access Registers 0 42 6 1 Bit Mapped U Register Detail defaults in bold 48 7 Parallel Interface Registers 64 8 Pin Descriptions Si2457 34 15 04 16 Pin Option 66 9 Pin Descriptions Si2457 34 15 04 24 Pin Option 67 10 Pin Descriptions 513018 10 69 TT Ordering Guide s oae ad ERE s cud rus be oe ed dase euren 70 12 Package Outline 24 Pin TSSOP 71 13 Package Outline 16 Pin SOIC 72 Document Change List tni edri eee hee EOS Ree be eee E es 73 Contact Information dee eh Ae bL Nat See
19. X 91 Link established at 40000 CONNECT 400004 X X X X X 92 Link established at 41333 CONNECT 413334 X X X X X 93 Link established at 42666 CONNECT 426664 X X X X X 94 Link established at 44000 CONNECT 440004 X X X X X 95 Link established at 45333 CONNECT 453334 X X X X X 96 Link established at 46666 CONNECT 46666 X X X X X 97 Link established at 49333 CONNECT 493334 X X X X X 98 Link established at 50666 CONNECT 50666 X X X X X Notes leading lt CR gt lt LF gt This message is only supported on the Si2457 Si2434 and Si2415 This message is only supported on the Si2457 and Si2434 Xis the only verbal response code that does not follow the lt CR gt lt LF gt Result Code lt CR gt lt LF gt standard There is no This message is only supported on the Si2457 SILICON LABORATORIES Rev 1 0 37 i2457 34 15 04 Table 14 Result Codes Continued 1 This message is only supported on the 5 2457 Si2434 and 512415 2 This message is only supported on the Si2457 and Si2434 3 X is the only verbal response code that does not follow the lt CR gt lt LF gt Result Code lt CR gt lt LF gt standard There is no leading lt CR gt lt LF gt 4 This message is only supported on the Si2457 Numeric Meaning Verbal Response X0 X1 X2 X3 X4 X5 99 Link established at 52000 CONNECT 520004 X X X X X 100 Link established at 53333 CONNECT 5
20. code is as follows MCR carrier e g MCR V32B MRR rate e g MRR 14400 MS Options Modulation Selection MS A A Preferred modem carrier A B V21 ITU T V 21 MS A B C V22 ITU T V 22 MS A B C D V22B ITU T V 22bis default for Si2404 MS A B C D E MS A B C D E F V32 ITU T V 32 V32B ITU T V 32bis default for 512415 V34 ITU T V 34 default for Si2434 V90 ITU T V 90 default for Si2457 B Automatic modulation negotiation 0 Disabled 1 Enabled CD Min TX rate Max TX rate are optional numeric values that specify the lowest value at which the DCE may establish a connection If unspecified set to 0 they are determined by the carrier and automode settings E F Min RX rate Max RX rate are optional numeric values which specify the highest value at which the DCE may establish a connection If unspecified set to 0 they are determined by the carrier and automode settings Rev 1 0 27 SILICON LABORATORIES i2457 34 15 04 Table 10 Basic AT Command Set Command Defaults in Bold Continued Command Action PCW X Controls the action to be taken upon detection of call waiting X Mode 0 Toggle RI and collect type Caller ID if enabled by VCID 1 Hang up 2 Ignore call waiting VCDT X Caller ID Type X Mode 0 After ring only 1 Always on 2 UK 3 Japan VCID X Caller ID Enable X Mode 0 Off 1 On formatted 2 On raw data format VCIDR Type II cal
21. the number of bit errors encountered on the previous amp T4 or amp T5 test amp T2 Initiate ITU T V 54 ANALOOP test Modulation set by amp H AT command Test loop is through the DSP Si2457 34 15 04 device only ISOmodem echoes data from TX pin Register 0 in parallel mode back to RX pin Register 0 in parallel mode amp T3 Initiate ITU T V 54 ANALOOP test Modulation set by amp H AT command Test loop is through the DSP 5 2457 34 15 04 DAA interface section Si2457 34 15 04 DAA interface 513018 and ana log hybrid circuit 513018 ISOmodem echoes data from TX pin Register 0 in parallel mode back to RX pin Register 0 in parallel mode Phone line termination required as in Figure 1 To test only the link operation the hybrid and AFE codec can be removed from the test loop by setting the DL bit U62 bit 1 amp T4 Initiate transmit as originating modem with automatic data generation Modulation data rate and symbol rate are set by amp H amp G and S41 Data pattern is set by the S40 register Continues until the ATH command is sent after an escape into command mode Data is also demodulated as in ANALOOP and any bit errors are counted to be displayed after the test using amp TO amp T5 Initiate transmit as answering modem with automatic data generation Modulation data rate and symbol rate are set by amp H amp G and S41 Data pattern is set by the S40 register Continues until the ATH command is sent after an e
22. to block the off hook intrusion algorithm from operation after dialing has begun 0 No intrusion blocking 1 Intrusion disabled from start of dial to end of dial 2 Intrusion disabled from start of dial to IS register time out Intrusion disabled from start of dial to connect CONNECT NO DIALTONE NO CARRIER 13 8 Reserved Read returns zero 7 0 IS 7 0 Intrusion Suspend 500 ms units When IB 2 this register sets the length of time from when dialing begins that the off hook intrusion algorithm is blocked suspended default 00000000 6 gt Rev 1 0 59 SILICON LABORATORIES i2457 34 15 04 U79 GEN4 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D5 D4 D3 D2 D1 DO Name LVCS 4 0 Type R Reset settings 0x0000 Bit Name Function 15 5 Reserved Read returns zero 4 0 LVCS 4 0 Line Voltage Current Sense Represents either the line voltage loop current or on hook line monitor On Hook Voltage Monitor 2 75 V bit 20 00000 No line connected 00001 Minimum line voltage Vmin 3 0 V x 0 5 V 11111 Maximum line voltage 87 V 20 The line voltage monitor full scale may be modified by changing R5 as follows Vmax Vmi 4 2 R5 1 6k R5 1 6k 5 Off Hook Loop Current Monitor 3 mA bit 00000 No loop current 00001 Minimum loop
23. 0110_0011 Bit Name Function 7 RXF Receive FIFO Almost Full status 0 Receive FIFO 12 deep contains three or more empty locations RXF lt 9 The host can clear the RXF interrupt without emptying the RX FIFO by writing a O to the RXF bit This will disable the RXF interrupt until the host has emptied the FIFO 1 Receive FIFO contains two or less empty locations RXF 10 6 TXE Transmit FIFO Almost Empty status 0 Transmit FIFO 14 deep contains three or more characters gt 3 1 Transmit FIFO contains two or less characters x 2 Note TXE interrupt will not trigger if the CTS bit is inactive Therefore the host does not need to poll CTS while waiting for transmit FIFO to empty TXE can be cleared by writing it to O 5 REM Receive FIFO Empty 0 Receive FIFO has valid data 1 Receive FIFO empty Note Ifthe interim timer see PTMR bits 7 0 set by PTMR expires it will cause an interrupt This interrupt will not set RXF TXE or INT The interrupt handler on the host should then verify that REM 0 and begin to empty the receive FIFO Parallel Interface 0 register until REM 1 4 INTM Interrupt Mask 0 In parallel mode the INT pin is triggered by a rising edge on RXF or TXE only default 1 In parallel mode the INT pin is triggered by a rising edge on RXF TXE or INT 3 INT Interrupt 0 No interrupt has occurred 1 Indicates that an int
24. 1 Places the 513018 powerdown mode 3 0 Reserved Must not change a read modify write Note Typically used only for board level debug 50 Rev 1 0 e SILICON LABORATORIES i2457 34 15 04 U66 DAAC5 Bit D15 014 D13 D12 011 010 09 D8 D7 D6 D5 D4 D3 D2 D1 DO Name FDT Type R Reset settings OxXX40 Bit Name Function 15 7 Reserved Do not modify 6 FDT Frame Detect 0 Indicates ISOmodem has not established frame lock 1 2 Indicates ISOmodem frame lock has been established 5 0 Reserved returns zero Note Typically used only for board level debug 6 gt Rev 1 0 51 SILICON LABORATORIES i2457 34 15 04 U67 ITC1 Bit D15 D14 013 012 D11 010 09 D7 D6 D5 D4 D3 D2 Di DO Name MINI 1 0 ILIM DCR OHS DCV 1 0 RZ RT Type R W R W RAW R W R W RAW R W Reset settings 0x0008 Bit Name Function 15 14 Reserved Read returns zero 13 12 MINI 1 0 Minimum Operational Loop Current Adjusts the minimum loop current at which the DAA can operate Increasing the minimum oper ational loop current can improve signal headroom at a lower TIP RING voltage MINI 1 0 Min Loop Current 00 10 mA 01 12 mA 10 14 mA 11 1
25. 12457 4 and GND see Table 8 ISOmodem attempts to detect an EEPROM The EEPROM is intended first for setting custom defaults second for automatically loading firmware upgrades and third to allow for user defined AT command macros for use in custom AT commands or country codes See AN93 Modem Designer s Guide for complete details 4 19 AT Commands At powerup the Si2457 34 15 04 is in the AT command mode In command mode the modem monitors the input serial or parallel checking constantly for a valid command AT commands are described in Table 10 20 Rev 1 0 SILICON LABORATORIES i2457 34 15 04 Table 10 Basic AT Command Set Command Defaults in Bold Command Action Display AT command mode settings Answer incoming call Be Re execute last command This is the only command not preceded by AT or followed by a CR Dial The dial command followed by 1 or more dial command modifiers manually dials a phone number Modifier Function amp Flash hook switch for FHT U4F ms default 500 ms lt Pause before continuing for S8 seconds default 2 seconds Return to AT command mode Wait for silence G Polarity reversal detect By placing the G character in the dial string i e ATDTG1 the Si2457 34 15 04 will monitor the telephone line for polarity reversals If a busy tone is detected the Si2457 34 15 04 will report
26. 3018 FS 0 to 70 C Si2434 33 6 kbps 16 pin SOIC Si2434 X FS Si3018 FS 0 to 70 C Si2415 14 4 kbps 24 pin TSSOP Si2415 X FT Si3018 FS 0 to 70 C Si2415 14 4 kbps 16 pin SOIC Si2415 X FS Si3018 FS 0 to 70 C Si2404 2400 bps 24 pin TSSOP Si2404 X FT Si3010 FS 0 to 70 C Si2404 2400 bps 16 pin SOIC Si2404 X FS Si3010 FS 0 to 70 C Notes 1 Add R at the end of the device to denote tape and reel option 2500 quantity per reel 2 X denotes product revision 70 Rev 1 0 s SILICON LABORATORIES i2457 34 15 04 12 Package Outline 24 Pin TSSOP Figure 9 illustrates the package details for the Si2457 34 15 04 24 pin packaging option Table 19 lists the values for the dimensions shown in the illustration Approximate device weight is 96 mg Figure 9 24 Pin Thin Shrink Small Outline Package TSSOP Table 19 Package Diagram Dimensions Millimeters Symbol Min Max A 1 20 A1 0 05 0 15 B 0 19 0 30 C 0 09 0 20 D 7 70 7 90 E 4 30 4 50 e 0 65 BSC H 6 40 BSC L 0 45 0 75 0 0 8 0 10 bbb 0 10 ddd 0 20 6 gt Rev 1 0 71 SILICON LABORATORIES i2457 34 15 04 13 Package Outline 16 Pin SOIC Figure 10 illustrates the package details for the Si3018 10 and the Si2457 34 15 04 16 pin packaging option Table 20 lists the values for the dimensions shown in the illustration D L D Detail F 0
27. 3333 X X X X X 101 Link established at 54666 CONNECT 54666 X X X X X 102 DTMF dial attempted on a UNCOBTAINABLE NUMBER X X X X X X pulse dial only line Notes The connect messages shown in Table 14 are sent when link negotiation is complete 38 Rev 1 0 SILICON LABORATORIES i2457 34 15 04 5 S Registers The S command allows reading Sn or writing Sn x the S registers The S registers store values for functions that typically are rarely changed such as timers or counters and the ASCII values of control characters such as carriage return Table 15 summarizes the S register set Table 15 S Register Description Definition S Register Decimal Function Default Decimal Range Units 0 Automatic answer Number of rings the Si2457 34 15 04 must detect before answering a call 0 disables auto answer 0 0 255 Rings Ring counter 0 255 Rings ESC code character 43 0 255 ASCII Carriage return character 13 CR 0 255 ASCII Linefeed character 10 LF 0 255 ASCII Backspace character 08 BS 0 255 ASCII Dial tone wait timer Number of seconds the Si2457 34 15 04 waits before blind dialing Only applicable if blind dialing is enabled X1 X3 02 0 255 seconds Carrier wait timer Number of seconds the Si2457 34 15 04 waits for carrier before timing out T
28. 512457 34 15 04 SILICON LABORATORIES V 90 V 34 V 32BiS 22 15 ISOMODEM wirH GLOBAL DAA Features m Data modem formats e ITU T Bell e 300 bps up to 56 kbps e V 21 V 22 V 29 Fast Connect Integrated DAA e Over 6000 V Capacitive isolation e Parallel phone detect e Globally compliant line interface V 42 V 42bis MNP2 5 Automatic rate negotiation e Overcurrent detection m Type II caller ID decode m 27 MHZ clock input m external ROM or RAM required P 3 3 V power m UART or parallel interface m Firmware upgradeable m AT command set support EEPROM interface SMS MMS support m Lead free RoHS Compliant Packages Applications m Set top boxes m Digital video recorder m Point of sale terminals m Digital televisions m Text video telephones m Remote monitoring Description The ISOmodem family of products is a complete modem ranging in speed from 56 000 bps to 2400 bps Offered as a chipset with the Si2457 Si2434 Si2415 or Si2404 system side device and the Si3018 10 line side device the ISOmodem utilizes Silicon Laboratories patented Direct Access Arrangement DAA technology to provide a programmable telephone line interface with an unparalleled level of integration These compact solutions eliminate the need for a separate DSP modem controller codec transformer relay opto isolators clocking crystal and 2 4 wire hybrid Available with a system side packaging option of eith
29. 6 mA 11 10 Reserved Read returns zero 9 ILIM Current Limiting Enable 0 Current limiting mode disabled 1 Current limiting mode enabled This mode limits loop current to a maximum of 60 mA per the TBR21 standard 8 Reserved Read returns zero 7 DCH DC Impedance Selection 0 Normal dc impedance This mode should be used for all standard applications 1 800 O dc termination 6 OHS On Hook Speed This bit works in combination with the OHS2 bit U62 bit 8 to set the on hook speed The on hook speeds are measured from the time the OH bit is cleared until loop current equals zero OHS OHS2 Mean On Hook Speed 0 0 Less than 0 5 ms 0 1 3 ms 10 meets ETSI standard 1 X 26 ms 10 meets Australia spark quenching spec 5 4 Reserved Read returns zero 3 2 DCV 1 0 TIP RING Voltage Adjust These bits adjust the voltage on the DCT pin of the line side device which affects the TIP RING voltage on the line Low voltage countries should use a lower TIP RING voltage Raising the TIP RING voltage can improve signal headroom DCV 1 0 DCT Pin Voltage 00 3 1V 01 3 2V 10 3 35 V 11 3 5V 52 Rev 1 0 s SILICON LABORATORIES i2457 34 15 04 Bit Name Function 1 RZ Ringer Impedance 0 Maximum high ringer impedance 1 Synthesize ringer impedance C15 R14 Z2 and Z3 must not be installed when setting this bit See the Ringer Impedanc
30. 8 Rev 1 0 6 gt SILICON LABORATORIES i2457 34 15 04 U53 MOD2 Bit D15 D14 D13 D12 D11 010 09 08 07 D6 D5 D4 D3 D2 D1 DO Name REV Type R W Reset settings 0x0000 Bit Name Function 15 REV V 23 Reversing 0 Disable 1 Enable 14 0 Reserved Read returns zero U62 DAAC1 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 05 D4 D3 D2 D1 DO Name 0 0 0 0 1 0 0 OHS2 0 0 0 0 0 DL 0 R W RAW R W Reset settings 0x0804 Bit Name Function 15 12 Reserved Must be set to 0 11 Reserved Must be set to 1 10 9 Reserved Must be set to 0 8 OHS2 On Hook Speed 2 This bit works in combination with the OHS bit U67 bit 6 to set the on hook speed The on hook speeds are measured from the time the OH bit is cleared until loop current equals zero OHS OHS2Mean On Hook Speed 0 0 Less than 0 5 ms 0 1 3 ms 10 meets ETSI standard 1 X26 ms 10 meets Australia spark quenching spec 7 3 Reserved Must be set to 0 2 FOH Fast Off Hook 0 Automatic Calibration Time set to 426 ms 1 Automatic Calibration Time set to 106 ms 1 DL Isolation Digital Loopback see the AT amp T commands 0 Loopback occurs beyond the DAA interface out to and including the analog hybrid ci
31. Action DR X Data compression reporting X 0 Disabled 1 Enabled If enabled the intermediate result code is transmitted at the point after error control negotia tion The format of this result code is as follows Result code Mode DR NONE Data compression is not in use DR V42B Rec V 42bis is in use in both directions DR V42B RD Rec V 42bis is in use in receive direction only DR V42B TD Rec V 42bis is in use in transmit directions only DS Options Controls V 42bis data compression function DS A A Direction 08 0 compression DS 1 Transmit only DS A B C D 2 Receive only 3 Both Directions B Compression_negotiation 0 Do not disconnect if V 42 is not negotiated 1 Disconnect is V 42 is not negotiated C Maximum dictionary size 512 D Maximum string size 6 to 250 28 default ES Options Enable synchronous access mode ES A A Specifies the mode of operation when initiating a modem connection ES A C D Disable synchronous access mode 6 Enable synchronous access mode when connection is completed and data state is entered B Specifies fallback mode of operation This parameter should not be used C Specifies the mode of operation when answer a modem connection D Disable synchronous access mode 8 Enable synchronous access mode when connection is completed and data state is entered 24 amp Rev 1 0 6 gt SILICON LABORATORIES i2457 34 15 04 Table 10 Basic AT Comman
32. C D6 4 21 3 3 15 20 GND CND 16 19 VDB 7 18 SD EESD D2 RTS D7 8 17 161 01 RXD RD 9 16 INT DO TXD WR 10 15 AOUT INT CTS CS 11 14 JC1A RESET 12 13 C2A Pin 2 Pin Name Description 1 CLKIN XTALI Clock Input Crystal Oscillator Pin Provides support for parallel resonant AT cut crystals A 4 9152 MHz crystal or a 4 9152 or 27 MHz clock on XTALI is required 2 XTALO Crystal Oscillator Pin Serves as the output of the crystal amplifier 3 CLKOUT EECS AO0 Clock Output EEPROM Chip Select Address Bit 0 Clock output in serial mode Active low read write enable for SPI EEPROM in serial mode when pin 4 is pulled low during powerup Address Enable in parallel mode 4 FSYNC D6 Frame Sync Data Bit Frame Sync output to codec in serial mode Bidirectional parallel bus data bit 6 in parallel mode 5 21 VD3 3 Digital Supply Voltage Provides the 3 3 V supply voltage to the Si2457 34 15 04 6 20 GND Ground Connects to the system digital ground 7 19 VDA VDB Regulator Voltage Reference Connects to an external capacitor and serves as the reference for the internal voltage regulator 8 RTS D7 Request to Send Data Bit Active low request to send input used for flow control in serial mode Bidirectional parallel bus data bit 7 in parallel mode 9 RXD RD Receive Data Read Enable Data output to DTE RXD pin in serial mode Active low read ena
33. D3 D2 D1 DO R1 4 0 Type R W Reset settings OxXF20 Bit Name Function 15 13 Reserved not modify 12 8 R1 4 0 R1 CLKOUT Divider See AN93 Modem Designer s Guide for details 7 0 Reserved Read returns zero 06 PTMR Bit D15 014 D13 012 D11 010 09 D amp D7 D6 05 D4 D3 D2 D1 DO Name 7 0 R W Reset settings OxOOFF Bit Name Function 15 8 Reserved Do not modify 7 0 PTMR 7 0 Parallel Port Receive FIFO Interrupt Timer See AN93 Modem Designer s Guide for details 6 gt Rev 1 0 55 SILICON LABORATORIES i2457 34 15 04 U70 100 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 05 D4 D3 D2 D1 DO Name HES TES CIDM OCDM PPDM RIM DCDM 0 CID OCD PPD RI DCD Type R W RAW R W RW RW R W RAV RW RW RW RW Reset settings 0x2700 Bit Name Function 15 HES Hardware Escape Pin 0 Disable 1 Enable 14 Reserved Read returns zero 13 TES Enable Escape 0 Disable 1 Enable 12 Caller ID Mask 0 Change in CID will not affect 1 A low to high transition in CID activates INT 11 Overcurrent Detect Mask 0 Change OCD does not affect INT X result code is not generated in command mode 1 A D to high transit
34. ESA ME 230 1S9 2 80 en er 1 1 820 5 9 tad 9 e 9 E 5 gt Lasas lt 1asay Pa ag Ki a Le or vio axa B baw Dy 1 x s 10 8 osa Sa 283 o 954 45 goa gt 1 1 tL SIS 518 9 2 Ecole 1 uondo suoissiug UA Ie lt en ic UP V ce ie s uondo si in god 0 oso 1 Sqe UODI IS jiuqns Soup no e xipueddy amp Rev 1 0 10 SILICON LABORATORIES i2457 34 15 04 uondo epis uiejs s uid pz e2id 9 4 lt _1 D ES 80 a t 9 9 9 so 4H d12 32e3ed Ly e ZONY i ESO ssedig al sera eso 180 zi 2 90 vo Bu lt lt 00 8556 enn 4 ET azo vzo SO SLO bat D S Busch A vH eo 1 14Q S14 a 20 SE alo i
35. HT 8 0 Type R W R W R W R W Reset settings 0 401 Bit Name Function 15 12 IST 3 0 Intrusion Settling Time 250 ms units Delay between when the ISOmodem goes off hook and the off hook intrusion algorithm begins Default is 1 s 11 HOI Hang Up On Intrusion 0 ISOmodem will not automatically hang up when an off hook PPD interrupt occurs 1 ISOmodem automatically hangs up on a PPD interrupt If Vn commands are set also causes the LINE IN USE result code upon PPD interrupt 10 Reserved Read returns zero AOC Auto Overcurrent 0 Disable 1 Enable Note AOC may falsely detect an overcurrent condition in the presence of line reversals or other transients Therefore this feature should not be used in applications or locations Such as Japan where line reversals are common or may be expected 8 0 OHT 8 0 Off Hook Time 1 ms units Time before LVCS is checked for overcurrent condition after going off hook 30 ms default 58 Rev 1 0 e SILICON LABORATORIES i2457 34 15 04 U78 GEN3 Bit D15 D14 D13 D12 011 010 09 07 D6 05 D4 D3 02 DO Name IB 1 0 IS 7 0 Type R W R W Reset settings Ox00XX Bit Name Function 15 14 IB 1 0 Intrusion Blocking Defines the method used
36. In Identification and checksum 10 Display Si2457 34 15 04 revision code B Revision B C Revision C etc 1 Display Si2457 34 15 04 firmware revision code numeric 13 Display line side revision code 18C Si3018 revision C 16 Display the SOmodem model number 2404 Si2404 2415 Si2415 2434 Si2434 2457 Si2457 I7 Diagnostic results 1 See AN93 Modem Designer s Guide for details 18 Diagnostic results 2 See 9 Modem Designer s Guide for details Ln Speaker volume operation L1 Low speaker volume L2 Medium speaker volume L3 High speaker volume Mn Speaker operation via AOUT MO Speaker is always off M1 Speaker is on while dialing and handshaking off in data mode M2 Speaker is always on M3 Speaker is off while dialing on during handshaking and retraining On Return to data mode from Command mode operation O0 Return to data mode O1 Return to data mode and perform a full retrain at any speed except 300 bps O2 Return to data mode and perform rate renegotiation Qn Response mode Q0 Enable result codes see Table 14 on page 36 Q1 Disable result codes enable quiet mode R Initiate V 23 reversal Sn S register operation see Table 15 on page 39 S List contents of all S registers Sn Display contents of S register n Sn x Set S register n to value x where n and x are decimal values Vn Result code type see Table 14 on page 36 VO Numeric result codes V1 Verbal result codes
37. N LABORATORIES
38. NOLN Report NO LINE and remain on hook NOLN x LVCS lt LIUS Report LINE IN USE and remain on hook LIUS x LCVS Go off hook and establish a modem connection Once the call has begun the off hook intrusion algorithm described in 4 12 2 Off Hook Intrusion Detection on page 18 operates normally In addition the Si2457 34 15 04 will report NO LINE if the telephone line is completely disconnected If the HOI bit 077 bit 11 is set LINE IN USE is reported upon intrusion 90V 2 Automatic Line Status Detection Adaptive Method Description Before going off hook with the ATD ATO or ATA commands the Si2457 34 15 04 com pares the line voltage via LVCS to the NLIU U85 register Loop Voltage Action 0 LVCS lt 0 0625 x NLIU Report NO LINE and remain on hook 0 0625 x NLIU lt LVCS lt 0 85 x NLIU Report LINE IN USE and remain on hook 0 85 x NLIU LCVS Go off hook and establish a modem connection The NLIU register is updated every 1 ms with the minimum non zero value of LVCS in the last 30 ms This allows the Si2457 34 15 04 to eliminate errors due to 50 60 Hz interference and also adapt to relatively slow change in the on hook dc reference value on the telephone line This algo rithm does not allow any non zero values for NLIU below 0x0007 The host may also initialize NLIU prior to issuing the V2 command Once the call has begun the off hook intrusion algorithm described in 4 12 2 Of
39. Supply Voltage Provides the 3 3 V supply voltage to the Si2457 34 15 04 5 RXD Receive Data Data output to DTE RXD pin 6 TXD Transmit Data Data input from DTE TXD pin 7 CTS Clear to Send Signals that the Si2457 34 15 04 is ready to receive more digital data on the TXD pin 8 RESET Reset Input An active low input that is used to reset all control registers to a defined initialized state 9 C2A Isolation Capacitor 2A Connects to one side of the isolation capacitor C2 10 C1A Isolation Capacitor 1A Connects to one side of the isolation capacitor C1 11 INT Interrupt Output Active low interrupt output 12 GND Ground Connects to the system digital ground 13 VA Regulator Voltage Reference Connects to an external capacitor and serves as the reference for the internal voltage regulator 14 ESC Escape A positive edge on this pin causes the modem to go from online connected mode to the offline command mode 15 DCD Carrier Detect Active low carrier detect 16 RTS Request to Send Active low request to send input used for flow control 66 Rev 1 0 e SILICON LABORATORIES i2457 34 15 04 9 Pin Descriptions Si2457 34 15 04 24 Pin Option Si2457 34 15 04 CLKIN XTALI 1 e 24 SDO EECLK D5 XTALO 2 23 DCD D4 CLKOUT EECS AO 3 22 JESC D3 FSYN
40. Threshold This value represents the number of bytes before a transmission is started The following values are special 0 The same as ten Upon receipt of ten bytes data is transferred The DTE must supply a closing flag within the required time or an underrun will occur 255 same as infinity e g never start a packet until the closing flag is received UAA V 29 Mode Bit D15 D14 013 012 D11 D10 D7 D6 05 D4 03 D2 D1 DO Name V29ENA Type R W Reset settings 0x0000 Bit Name Function 15 2 Reserved Reads returns to zero 1 V29ENA 0 Disables V 29 1 Enables V 29 0 Reserved Read returns zero s Rev 1 0 63 SILICON LABORATORIES i2457 34 15 04 7 Parallel Interface Registers Parallel Interface 0 0x00 Bit D7 D6 D5 D4 D3 D2 D1 DO Name TX RX 7 0 Type R W Reset settings 0x00 Bit Name Function 7 0 TX RX 7 0 Parallel Interface Transmit Receive This register functions similarly to the serial port TX pin on writes to the parallel port and sim ilarly to the serial port RX pin on reads from the parallel port 64 Rev 1 0 e SILICON LABORATORIES i2457 34 15 04 Parallel Interface 1 0x01 Bit D7 D6 D5 D4 D3 D2 D1 DO INTM INT ESC RTS CTS Type R R R R W R R W R W R Reset settings
41. Transparent HDLC mode 0 FAST Fast Connect 0 Normal modem handshake timing per ITU Bellcore standards 1 Fast connect modem handshake timing Note When V22HD HDLC or FAST bits are set NO wire mode must be used 6 gt Rev 1 0 61 SILICON LABORATORIES i2457 34 15 04 U7C GENC Bit D15 D14 D13 012 D11 010 09 07 05 D4 D3 D2 Di DO Name RIGPO RIGPOEN Type R R W Reset settings 0x0000 Bit Name Function 15 5 Reserved Reads returns to zero 4 RIGPO RI RI follows this bit when RIGPIOEN 1p 3 1 Reserved Reads returns to zero 0 RIGPOEN 0 RI indicates valid ring signal Normal ring indicator mode 1 can be used as a general purpose output and follows U7C 4 RIGPO U7D GEND Bit 015 014 013 012 011 010 D8 D7 D6 05 D4 D3 D2 D1 DO Name NLM ATZD FDP Type R W R W R W Reset settings 0x0000 Bit Name Function 15 Reserved Reads returns to zero 14 NLM 0 Enables No Loop Current detect 1 Disables No Loop Current detect 13 2 Reserved Reads returns to zero 1 ATZD ATZ Disable 0 ATZ functions normally 1 Disable ATZ command 0 FDP FSK Data Processing 0 FSK data processing stops when carrier is lost 1 FSK data proces
42. X X X X 17 Link established at 14400 CONNECT 14400 X X X X X 18 Link established at 16800 CONNECT 168002 X X X X X 19 Link established at 21600 CONNECT 216002 X X X X X 20 Link established at 24000 CONNECT 240002 X X X X X 21 Link established at 26400 CONNECT 264002 X X X X X 22 Link established at 28800 CONNECT 288002 X X X X X 23 Link established at 31200 CONNECT 312002 X X X X X 24 Link established at 33600 CONNECT 336002 X X X X X 30 Caller ID mark detected CIDM X X X X X X 31 Hookswitch flash detected FLASH X X X X X X 32 UK CID State Tone Alert STAS X X X X X X Signal detected 33 Overcurrent condition 40 Blacklist is full BLACKLIST FULL enabled X X X X X X via S42 register 41 Attempted number is black BLACKLISTED enabled via X X X X X X listed S42 register 42 No phone line present NO LINE enabled via Vn X X X X X X commands Notes 1 This message is only supported on the Si2457 Si2434 and Si2415 2 This message is only supported on the Si2457 and Si2434 3 Xis the only verbal response code that does not follow the lt CR gt lt LF gt Result Code lt CR gt lt LF gt standard There is no leading lt CR gt lt LF gt 4 This message is only supported on the Si2457 36 Rev 1 0 SILICON LABORATORIES i2457 34 15 04 Table 14 Result Codes Continued
43. ble pin in parallel mode SILICON LABORATORIES Rev 1 0 67 i2457 34 15 04 Pin Pin Name Description 10 TXD WR Transmit Data Write Enable Data input from DTE TXD pin in serial mode Active low write enable pin in paral lel mode 11 CTS CS Clear to Send Chip Select Signals that the Si2457 34 15 04 is ready to receive morre digital data on the TXD pin in data mode Active low chip select in parallel mode 12 RESET Reset Input An active low input that is used to reset all control registers to a defined initialized state 13 C2A Isolation Capacitor 2A Connects to one side of the isolation capacitor C2 14 C1A Isolation Capacitor 1A Connects to one side of the isolation capacitor C1 15 AOUT INT Analog Output Interrupt Output Analog output in serial mode Active low interrupt output in parallel mode 16 INT DO Interrupt Output Data Bit Active low interrupt output in serial mode Bidirectional parallel bus data bit O in parallel mode 17 RI D1 Ring Indicator Data Bit The RI on active low indicates the presence of an ON segment of a ring signal on the telephone line Bidirectional parallel bus data bit 1 in parallel mode 18 SDI EESD D2 Serial Data In EEPROM Serial Data Input Output Data Bit Serial Data In to codec output in serial mode Bidirectional Input Output to SPI EEPROM in serial mode when pin 4 is pulled low during power up Bidirectional para
44. can generate all the internal clocks required to support the featured modem protocols Either a 27 MHz or 4 9152 MHz clock 3 3 V max input see Table 5 on page 7 on XTALI or a 4 9152 MHz crystal across XTALI and XTALO form the master clock 100 ppm max for the ISOmodem This clock source is sent to an internal PLL that generates all necessary internal system clocks including the DSP clock By default the Si2457 34 15 04 assumes a 4 9152 MHz clock input If a 27 MHz clock on XTALI is used with the serial UART interface a pulldown resistor lt 10 must be placed between DCD and GND If a 27 MHz clock on XTALI is used with the parallel interface a pulldown resistor lt 10 kQ must be placed between CTS CS pin 11 and GND and AOUT INT and GND see Tables 8 and 9 Using the S24 S register the Si2457 34 15 04 can be set to automatically enter sleep mode after a pre programmed time of inactivity with either the DTE or the remote modem The sleep mode is entered after S24 seconds have passed since the TX FIFO has been empty The ISOmodem remains in the sleep state until either a 1 to 0 transition on TXD serial mode or a 1 to 0 transition on CS parallel mode occurs Additionally the Si2457 34 15 04 may be placed in a complete powerdown mode or wake on ring mode Complete powerdown is accomplished via U65 13 PDN Once the PDN bit is written the Si2457 34 15 04 completely powers down and can only be powered back on via the
45. capacitor C2 and communicates with the system side 7 VREG Voltage Regulator Connects to an external capacitor to provide bypassing for an internal power supply 8 RNG1 Ring 1 Connects through a resistor to the RING lead of the telephone line Provides the ring and caller ID signals to the Si2457 34 15 04 9 RNG2 Ring 2 Connects through a resistor to the TIP lead of the telephone line Provides the ring and caller ID signals to the Si2457 34 15 04 10 VREG2 Voltage Regulator 2 Connects to an external capacitor to provide bypassing for an internal power supply 11 SC SC Connection Enables external transistor network Should be tied through a 0 resistor to 12 QE2 Transistor Emitter 2 Connects to the emitter of Q4 13 QB Transistor Base Connects to the base of transistor Q4 14 DCT3 DC Termination 3 Provides the dc termination to the telephone network 15 IGND Isolated Ground Connects to ground on the line side interface 16 DCT2 DC Termination 2 Provides dc termination to the telephone network amp s Rev 1 0 69 SILICON LABORATORIES i2457 34 15 04 11 Ordering Guide Chipset Max Speed Digital Package Digital Line Temp Range Si2457 56 kbps 24 pin TSSOP Si2457 X FT Si3018 FS 0 to 70 C Si2457 56 kbps 16 pin SOIC Si2457 X FS Si3018 FS 0 to 70 C Si2434 33 6 kbps 24 pin TSSOP Si2434 X FT Si
46. ce EIA TIA 232 E ITU T V 24 V 28 ISO 2110 Line Equalization Automatic Adaptive Connection Options Loss of Carrier in ITU T V 22bis and lower Phone Types 500 rotary dial 2500 DTMF dial Dialing Pulse and Tone DTMF Output Level Per Part 68 Pulse Dial Ratio Make Break 39 61 Ring Cadence On 2 seconds Off 4 seconds Call Progress Monitor BUSY CONNECT rate NO ANSWER NO CARRIER NO DIALTONE OK RING RINGING Notes 1 Supported on Si2457 only 2 Supported on Si2457 and Si2434 only 3 Supported on Si2457 Si2434 and Si2415 only SILICON LABORATORIES Rev 1 0 15 i2457 34 15 04 4 Functional Description The 512457 34 15 04 ISOmodem is complete embedded modem chipset with integrated direct access arrangement DAA that provides a programmable line interface to meet global telephone line requirements Available in two small packages this solution includes a DSP data pump modem controller on chip RAM and ROM codec DAA analog output and 27 MHz clock input The Si2457 34 15 04 accepts standard modem AT commands and provides connect rates up to 56 33 6 14 4 2 4 kbps full duplex over the Public Switched Telephone Network PSTN The 512457 34 15 04 features a complete set of modem protocols including all ITU T standard formats up to 56 kbps To provide the most flexibility the Si2457 34 15 04 ISOmodem system side device is o
47. current 11110 Maximum loop current 11111 Loop current is excessive overload Overload 140 mA in all modes except TBR21 Overload 54 mA in TBR21 mode LVCS is backward compatible with Si2456 33 14 ISOmodems LVCS value is absolute and does not reflect loop polarity See U6C LVS 15 8 for 1 V bit resolution and signed twos complement output amp 60 Rev 1 0 s SILICON LABORATORIES i2457 34 15 04 U7A GENA Bit D15 D14 D13 012 D11 D10 07 D6 D5 D4 D2 D1 DO Name DOP ADD V22HD HDLC FAST Type R W R W RW RW RW Reset settings 0x0000 Bit Name Function 15 8 Reserved Read returns to zero 7 DOP Dial or Pulse 0 Normal ATDTW operation 1 Use ATDTW for Pulse Tone Dial Detection see also ATDW command 6 ADD Adaptive Dialing 1 Enable 0 Disable Attempt DTMF dial then fall back to pulse dialing if unsuccessful First digit is dialed as DTMF If a dialtone is still present after two seconds the Si2457 34 15 04 will redial the first digit and remaining digits as pulse If a dialtone is not present after two seconds the Si2457 34 15 04 will dial the remaining digits as DTMF 5 3 Reserved Read returns to zero 2 V22HD V 22bis Synchronous Mode 0 Normal asynchronous mode 1 Transparent HDLC mode 1 HDLC Synchronous Mode 0 Normal asynchronous mode 1
48. d Set Command Defaults in Bold Continued Command Action ESA Options Synchronous access mode control options ESA A A Specifies action taken if an underrun condition occurs during transparent sub mode ESA 0 Modem transmits 8 bit SYN sequences on idle ESA A B C B Specifies action taken if an underrun condition occurs after a flag during framed sub ESA A B C E mode ESA A B C E F ESA A B C E F G 0 Modem transmits 8 bit HDLC flags on idle C Specifies action taken if an underrun or overrun condition occurs after a non flag during framed sub mode 0 Modem transmits abort on underrun in middle of frame 1 Modem transmits flag on underrun in middle of frame and notifies host of underrun or overrun D Specifies V 34 half duplex operation This parameter should not be used E Specifies CRC polynomial used while in framed sub mode 0 CRC generation checking disable 1 16 bit CRC generation and checking is performed by the modem F Specifies NRZI encoding and decoding 0 NRZI encoding and decoding disabled Specifies SYN 255 FCLASS X Class 1 Mode Enable for V 29 fast connect X Mode 0 Off 1 Enables support for Class 1 mode for use in the V 29 fast connect mode FRM Class 1 Receive Carrier for V 29 fast connect X Mode 2 Transmit V 21 980 Hz tone for longer than 100 ms then send answer tone 2100 2225 Hz for 200 ms 95 V 29 short synchronous 96 V 29 full synchronous FTM
49. deactivated on this read M Write to serial EEPROM Program RAM Write This command is used to upload firmware supplied by Silicon Labs to the Si2457 34 15 04 The format for this command is where aaaa 15 the first address in hexadecimal and is data in hexadecimal Only one com mand is allowed per AT command line No other commands can be concatenated in the P command line This command is only for use with special files provided by Silicon Laborato ries Do not attempt to use this command for any other purpose R User Access Register Read This command allows the user to read from the user access registers See pages page 42 60 The format is where aa user access address in hexadecimal The AT R command causes all the U registers to be displayed U User Access Register Write This command allows the user to write to the 16 bit user access registers See page page 42 The format is AT Uaa xxxx yyyy Zzzz where aa user access address in hexadecimal xxxx Data in hexadecimal to be written to location aa yyyy Data in hexadecimal to be written to location aa 1 2222 Data hexadecimal to be written to location 2 etc amp s Rev 1 0 23 SILICON LABORATORIES i2457 34 15 04 Table 10 Basic AT Command Set Command Defaults in Bold Continued Command
50. e section in AN93 Modem Designer s Guide 0 RT Ringer Threshold Select Used to satisfy country requirements on ring detection Signals below the lower level does not generate a ring detection signals above the upper level are guaranteed to generate a ring detection 0 11 to 22 Vims 1 17 to 33 Vims U68 ITC2 Bit D15 D14 013 012 D11 010 09 D8 D6 D5 D4 D3 02 D1 DO Name BTE ROV BTD Type RAW R W RAW Reset settings 0x0000 Bit Name Function 15 3 Reserved Do not modify 2 BTE Billing Tone Protect Enable 0 Disabled 1 Enabled When set the DAA responds automatically to a collapse of the line derived power supply dur ing a billing tone event When off hook if BTE 1 and BTD goes high the dc termination is released 800 Q presented to line If BTE and RIM 070 bit 9 are set an RI 070 bit 1 interrupt also occurs when BTD goes high ROV Receive Overload The bit is set when the receive input i e receive pin goes below ground has an excessive input level This bit is cleared by writing a 0 to this location 0 Normal receive input level 1 Excessive receive input level BTD Billing Tone Detected This bit is set if a billing tone is detected This bit is cleared by writing a 0 to this location 0 No billing tone 1 Billing tone detected e Rev 1 0 53 SILICON LABORATORIES i2457 34
51. e maximum total time in seconds multiplied by 2400 0x6720 U4D MOD This is a bit mapped register 0x0000 U4E PRDD _ Pre dial delay time after command that modem waits to dial ms units 0x0000 Si2457 34 15 04 stays on hook during this time 44 Rev 1 0 e SILICON LABORATORIES i2457 34 15 04 Table 16 U Register Description Continued Register Description Default U4F FHT Flash Hook Time Time corresponding with or amp dial modifier that the 0x01F4 Si2457 34 15 04 goes on hook during a flash hook ms units U50 LCDN Loop current debounce on time ms units 0x015E U51 LCDF Loop current debounce off time ms units 0x00C8 U52 XMTL Transmit level 1 dB units Sets the modem data pump transmitter level 0x0000 Default level of 0 corresponds to 9 85 dBm Transmit level 9 85 XMTL dBm Range 9 85 to 48 U53 MOD 2 This is a bit mapped register 0x0000 U62 DAAC1 This is a bit mapped register 0x0804 U63 DAACS3 _ This is a bit mapped register 0x0003 U65 DAACA is a bit mapped register 0 00 0 066 DAAC5 is bit mapped register OxXX40 U67 ITC1 This is a bit mapped register 0x0008 U68 ITC2 This is a bit mapped register 0x0000 U6A ITC4 This is a bit mapped register N A U6C LVS This is a bit mapped register OxXX00 U6E CK1 Thi
52. e with ITU specifications frequency tolerance must be less than 100 ppm including initial accuracy 5 year aging 0 to 70 C and capacitive loading 50 ppm initial accuracy crystals typically satisfy this requirement 12 Rev 1 0 SILICON LABORATORIES i2457 34 15 04 Table 7 Protocol Characteristics Item Specification Data Rate 56 kbps 54 666 kbps 53 333 kbps 52 kbps 50 666 kbps 49 333 kbps 48 kbps 46 666 kbps 45 333 kbps 44 kbps 42 666 kbps 41 333 kbps 40 kbps 38 666 kbps 37 333 kbps 36 kbps 34 666 kbps 33 333 kbps 32 kbps 30 666 kbps 29 333 kbps 28 kbps 33 6 kbps 31 2 kbps 28 8 kbps 26 4 kbps 24 0 kbps 21 6 kbps 19 2 kbps 16 8 kbps 14 4 kbps 12 0 kbps 9600 bps 7200 bps 4800 bps 2400 bps 1200 bps 300 bps 300 bps ITU T V 901 ITU T V 90 ITU T V 901 ITU T V 901 ITU T V 901 ITU T V 90 ITU T V 90 ITU T V 90 ITU T V 90 ITU T V 90 ITU T V 901 ITU T V 901 ITU T V 90 ITU T V 90 ITU T V 901 ITU T V 901 ITU T V 90 ITU T V 90 ITU T V 90 ITU T V 90 ITU T V 901 ITU T V 901 ITU T V 342 ITU T V 342 ITU T V 342 ITU T V 342 ITU T V 342 ITU T V 342 ITU T V 342 ITU T V 342 ITU T V 34 or V 32bis ITU T V 34 or V 32bis ITU T V 34 V 32bis or V 29 ITU T V 34 or V 32bis ITU T V 34 or V 32bis ITU T V 34 or V 22bis ITU T V 22bis V 23 or Bell 212A ITU T V 21 Bell 103 Data Format Bit asynchronous Selectable 8
53. ect when another telephone modem or other device is using the phone line This allows the host to avoid interrupting another phone call when the phone line is already in use and to intelligently handle an interruption when the ISOmodem is using the phone line 4 12 1 On Hook Line in use Detection 30 25 20 When the ISOmodem is sharing the telephone line with other devices it is important that it not interrupt a call in progress To detect whether another device is using the shared telephone line the host can use the ISOmodem to monitor the TIP RING dc voltage with the line voltage sense LVS register U6C bits 15 8 The LVS bits have a resolution of 1 V per bit with an accuracy of approximately 10 Bits O through 6 of this 8 bit signed twos complement number indicate the value of the line voltage and the sign bit bit 7 indicates the polarity of TIP and RING The ISOmodem can also monitor the TIP RING dc voltage using the LVCS register U79 bits 4 0 See Figure 7 on page 18 See also the Vn commands for automatic line in use detection 4 12 2 Off Hook Intrusion Detection When the ISOmodem is off hook an algorithm is implemented in the to automatically monitor the TIP RING loop current via the LVCS register During the off hook state the LVCS register switches from representing the TIP RING voltage to representing the TIP RING current See 8 on page 19 Upon detecting an intrusion the ISO
54. ed in autobaud mode default TO through T15 will lock the new baud rate and disable autobaud On the 24 pin version the ISO is not in autobaud mode pin 18 low on powerup the result code is sent at the old DTE rate Subsequent commands must be sent at the new rate TO 300 bps T1 600 bps T2 1200 bps T3 2400 bps T4 4800 bps T5 7200 bps T6 9600 bps T7 12 0 kbps T8 14 4 kbps T9 19 2 kbps T10 38 4 kbps T11 57 6 kbps T12 115 2 kbps T13 230 4 kbps T14 245 760 kbps T15 307 200 kbps T16 Autobaud on T17 Autobaud off lock at current baud rate U Serial mode causes a low pulse 25 ms on RI and DCD INT to be the inverse of ESC RTS to be inverse of CTS m Parallel mode causes a low pulse 25 ms on INT This command terminates with a RESET Notes 1 When in autobaud mode 180 181 and P1 will not be detected automatically The combination of B2 and P3 will be detected This is compatible with seven data bits no parity two stop bits Seven data bits no parity one stop bit may be forced by sending AT T17 B1 2 The autobaud feature does not detect this rate 34 amp Rev 1 0 SILICON LABORATORIES i2457 34 15 04 Table 13 Extended AT Command Set Command Defaults in Bold Continued Command Action Wn Connect message type WO Report connect message and protocol message W2 Report connect message only
55. er a 16 pin SOIC or a 24 pin TSSOP these devices are ideal for embedded modem applications due to their flexibility small footprint and minimal external component count Functional Block Diagram RAM ROM Data Bus DAA Interface To Phone Line Microcontroller Si3018 10 Ordering Information This data sheet is valid only for those chipset combinations listed on page page 70 Pin Assignments Si2457 34 15 04 16 Pin Option 16 15 14 13 12 11 10 9 CLKIN XTALI XTALO RI Vo RXD TXD CTS RESET JO OD RON Si2457 34 15 04 24 Pin Option CLKIN XTALI 1 e 24 SDO EECLK D5 XTALO 23 DCD D4 CLKOUT EECS AO 22 ESC D3 FSYNC D6 21 VD3 3 VD3 3 20 GND GND 19 VDB VDA 18 JSDI EESD D2 RTS D7 17 L JRUD1 RXD RD 16 JINT DO TXD WR 15 CTS CS 14 C1A RESET 13 C2A 513018 10 16 15 14 13 12 11 10 9 Rev 1 0 2 05 Copyright 2005 by Silicon Laboratories 512457 34 15 04 This information applies to a product under development Its characteristics and specifications are subject to c
56. errupt CID OCD PPD RI or DCD from U70 has occurred This bit is cleared via the command 2 ESC Escape Operation of this bit in parallel mode is functionally equivalent to the ESC pin in serial mode 1 RTS Request to Send Operation of this bit in parallel mode is functionally equivalent to the RTS pin in serial mode Use of the CTS and RTS bits as opposed to the TXE and RXF bits allows the flow control between the host and the SOmodem to operate 1 byte at a time rather than in blocks 0 CTS Clear to Send Operation of this bit in parallel mode is functionally equivalent to the CTS pin in serial mode Use of the CTS and RTS bits as opposed to the TXE and RXF bits allows the flow control between the host and the ISOmodem to operate 1 byte at a time rather than in blocks amp 6 gt Rev 1 0 65 SILICON LABORATORIES i2457 34 15 04 8 Pin Descriptions Si2457 34 15 04 16 Pin Option Si2457 34 15 04 CLKIN XTALI Pin Pin Name Description 1 CLKIN XTALI XTALI Crystal Oscillator Pin Provides support for parallel resonant AT cut crystals A 4 9152 MHz crystal or a 4 9152 or 27 MHz clock on XTALI is required 2 XTALO XTALO Crystal Oscillator Pin Serves as the output of the crystal amplifier 3 RI Ring Indicator The RI on active low indicates the presence of an ON segment of a ring signal on the tele phone line 4 Vp
57. f Hook Intrusion Detection on page 18 operates normally In addition the 512457 34 15 04 will report NO LINE if the telephone line is completely disconnected If the U77 bit 11 bit is set LINE IN USE is reported upon intrusion 32 Rev 1 0 s SILICON LABORATORIES i2457 34 15 04 Table 13 Extended AT Command Set Command Defaults in Bold Command Action Display AT command settings Bn Character length will be automatically set in autobaud mode BO 6N1 six data bits no parity one stop bit one start bit eight bits total NO only B1 7N1 seven data bits no parity one stop bit one start bit nine bits total NO only B2 7P1 seven data bits parity optioned by P one stop bit one start bit 10 bits total B3 8N1 eight data bits no parity one stop bit one start bit 10 bits total B5 8P1 eight data bits parity optioned by P one stop bit one start bit 11 bits total NO only B6 8X1 eight data bits one escape bit one stop bit one start bit 11 bits total enables ninth bit escape mode Nn Asynchronous protocol NO Wire mode no error correction no compression N2 MNP reliable mode The Si2457 34 15 04 attempts to connect with the MNP protocol If unsuccess ful the call is dropped N3 V 42 auto reliable The Si2457 34 15 04 attempts to connect with the V 42 protocol If u
58. ffered in either 24 pin TSSOP or a 16 pin SOIC package The 16 pin version is footprint compatible with the 512401 ISOmodem and is recommended for most applications The 16 pin version does not support the parallel EEPROM or voice codec interface If these features are required customers should use the 24 pin version The ISOmodem provides numerous additional features for embedded modem applications The modem includes full type and type II caller ID detection and decoding for global standards Call progress monitoring is supported through standard result codes The modem is also programmable to meet global settings Because the 2457 34 15 04 ISOmodem integrates the DAA analog features such as parallel phone detect overcurrent detection and global PTT compliance with a single design are included This device is ideal for embedded modem applications due to its small board space low power consumption and global compliance The Si2457 34 15 04 solution includes a silicon DAA using Silicon Laboratories proprietary third generation DAA technology This highly integrated DAA can be programmed to meet worldwide PTT specifications for ac termination dc termination ringer impedance and ringer threshold In addition the Si2457 34 15 04 has been designed to meet the most stringent worldwide requirements for out of band energy billing tone immunity surge immunity and safety requirements 512457 34 15 04 allows for ra
59. fore setting country specific values Changes may be made by writing individual registers after sending the AT GCl command Refer to AN93 Modem Designer s Guide for details GCI List current country code setting response is GCl lt setting gt GCl List all possible country code settings 26 Rev 1 0 s SILICON LABORATORIES i2457 34 15 04 Table 10 Basic AT Command Set Command Defaults in Bold Continued Command Action IFC Options Specifies the flow control to be implemented A Specifies the flow control method used by the host to control data from the modem 0 None 1 Local XON OFF flow control Does not pass XON XOFF character to the remote modem 2 Hardware flow control RTS B Specifies the flow control method used by the modem to control data from the host 0 None 1 Local XON OFF flow control 2 Hardware flow control CTS ITF Options Transmit flow control threshold ITF A A Threshold above which the modem will generate a flow off signal ITF A B lt 0 to 511 gt bytes ITF A B C B Threshold below which the modem will generate a flow on signal 0 to 511 bytes C Polling interval for lt gt lt gt indicator 0 to 300 in 10 msec units MR X Modulation reporting control X 0 Disabled 1 Enabled If enabled the intermediate result code is transmitted at the point during connect negotiation The format of this result
60. ful the modem responds with the response codes detailed in Table 14 on page 36 and enters data mode 4 4 Data Mode Si2457 34 15 04 SOmodem is in data mode while it has a telephone line connection to another modem or is in the process of establishing a connection Data protocols are available to provide error correction to improve reliability V 42 and MNP2 4 and data compression to increase throughput V 42bis and MNP5 Each connection between two modems in data mode begins with a handshaking sequence During this sequence the modems determine the line speed data protocol and related parameters for the data link Configuration through AT commands determines the range of choices available to the modem during the negotiation process 4 5 Fast Connect The Si2457 34 15 04 supports a fast connect mode of operation to reduce the time of a connect sequence in originate mode The Fast Connect modes can be enabled for V 21 V 22 Bell103 and V 29 modulations See AN93 Modem Designer s Guide for details 4 6 V 80 Synchronous Access Mode The 512457 34 15 04 supports a V 80 synchronous access mode of operation which operates with an asynchronous DTE and a synchronous DCE See AN93 Modem Designer s Guide for complete details 4 7 Clocking Low Power Modes The Si2457 34 15 04 contains an on chip phase locked loop PLL and clock generator Using either a single crystal or master clock input the Si2457 34 15 04
61. hange without notice i2457 34 15 04 2 Rev 1 0 SILICON LABORATORIES i2457 34 15 04 TABLE OF CONTENTS Section Page 1 Electrical Specifications 55 u 2 25 e E RE EN Ee 4 2 Typical Application Schematic 10 3 Bill of Materials Si2457 34 15 04 Chipset 12 4 Functional Description cic steerer bees ete steed ew vii LEX 16 EE Me e 16 4 2 Parallel Interface 24 Pin Version Only 16 4 3 oP Ej AR Rare e HOO od e WA Se 17 MOUS eco Vibia Ble Cu Calo 17 4 5 COMECE a oy E as X DEUS ER 17 4 6 V 80 Synchronous Access ob ree ERG Rn hse Meee Sees 17 4 7 Clocking Low Power Modes 17 4 8 Data Compression dl e EE Ee CH Ae Ei ee 17 4 9 Eror Correction s oso evades Dd Soe i hak MUS Nur Parc GU eG eed iu yd 17 2 10 MITG MOOD a cine rper Und nei ad po ret posta ut eed GS 18 Galler ID Operation z 2252 3 4 2 9 Had Rid Oba 18 4 12 Parallel Phone 18 4 13 Overcurrent Detection s aan ake areca i tlc o Gora BR a E RC a
62. hip Select Hold 0 RD Low Pulse Width 50 RD Low to Data Driven Time Data Hold 10 RD High to Hi Z Time Read Cycle Time 120 Note All timing is referenced to the 50 level of the waveform Input test levels are Vu Vp 0 4 V Vy 0 4 V amp s Rev 1 0 7 SILICON LABORATORIES i2457 34 15 04 UART Time for Modem Receive Path 8N1 Mode 8 Bit Data Mode UART Timing for Modem Transmit Path 9N1 Mode with 9th Bit Escape 9 Bit Data Mode Figure 2 Asynchronous UART Serial Interface Timing Diagram 8 Rev 1 0 SILICON LABORATORIES i2457 34 15 04 toss tos CS Pd tis tan e a AO x ADDRESS 0 or 1 K tre ea a RD s y le DZ tatoo ton D 7 0 VALID DATA VALID DATA RLDD Figure 3 Parallel Interface Read Timing CSS CSH tan tas dei tur twe WR Em Figure 4 Parallel Interface Write Timing amp e Rev 1 0 SILICON LABORATORIES i2457 34 15 04 2 Typical Application Schematic uondo epis uiejs s u d 9 e2id 9 amb d t Kal Kal os 8 L NY o 92 99 5 ub eu
63. his register also sets the number of seconds the modem waits for ringback when originating a call before hanging up This register also sets the number of seconds the answer tone will continue while using the AT Y2A command 80 0 255 seconds Dial pause timer for and lt dial command modifiers 02 0 255 seconds Carrier presence timer Time after a loss of carrier that a carrier must be detected before reactivating DCD S9 is referred to as carrier loss debounce time 06 1 255 0 1 second 10 Carrier loss timer Time the carrier must be lost before the Si2457 34 15 04 disconnects Setting 255 disables disconnect entirely If S10 is less than S9 even a momentary loss of carrier causes a disconnect 14 1 255 0 1 second 12 Escape code guard timer Minimum guard time required before and after for the Si2457 34 15 04 to recognize a valid escape sequence 50 1 255 0 02 second 14 Wait for dial tone delay value in relation to the W dial modifier Starts when W is executed in the dial string 0 255 seconds Rev 1 0 SILICON LABORATORIES 39 i2457 34 15 04 Table 15 S Register Description Continued Definition S Register Function Default Range Units Decimal Decimal 24 Sleep Inactivity Time Sets the time that the modem 0 0 255 seconds operates in normal power mode with no activity on the seria
64. igure 1 on page 5 Receive full scale level produces 0 9 dBFS at DTX DR 20 x log Vin 20 x log rms signal rms noise Applies to both transmit and receive paths Vin 1 kHz 3 dBFS Vin 1 kHz 3 dBFS THD 20 log rms distortion rms signal Rev 1 0 SILICON LABORATORIES i2457 34 15 04 Table 5 Absolute Maximum Ratings Parameter Symbol Value Unit DC Supply Voltage Vp 4 1 V Input Current Si2457 34 15 04 Digital lin 10 mA Input Pins Digital Input Voltage VIND 0 3 to 5 3 V CLKIN XTALI Input Voltage VXIND 0 3 to Vp 0 3 V Operating Temperature Range TA 10 to 100 C Storage Temperature Range Ter 40 to 150 C Note Permanent device damage may occur if the above absolute maximum ratings are exceeded Functional operation should be restricted to the conditions as specified in the operational sections of this data sheet Exposure to absolute maximum rating conditions for extended periods may affect device reliability Table 6 Switching Characteristics Vp 3 0 to 3 6 V TA 0 to 70 C for F Grade Parameter CLKOUT Output Clock Frequency Baud Rate Accuracy Start Bit 4 to RTS 4 CTS or RTS 7 High to Start Bit 10 Stop Bit 1 to CTS 7 RESET to RESET 1 5 0 RESET f to 1st AT Command Address Setup 15 Address Hold 0 WR Low Pulse Width 50 Write Data Setup Time 20 Write Cycle Time Chip Select Setup 10 C
65. in seconds multiplied by 7200 0x1200 U34 DTWD Window to look for dialtone in seconds multiplied by 1000 0x1B58 U35 dialtone on time in seconds multiplied by 7200 0x2D00 U37 PDO Number of pulses to dial 0 0x000A U38 PD1 Number of pulses to dial 1 0x0001 U39 PD2 Number of pulses to dial 2 0x0002 U3A PD3 Number of pulses to dial 3 0x0003 U3B PD4 Number of pulses to dial 4 0x0004 U3C PD5 Number of pulses to dial 5 0x0005 U3D PD6 Number of pulses to dial 6 0x0006 U3E PD7 Number of pulses to dial 7 0x0007 U3F PD8 Number of pulses to dial 8 0x0008 U40 PD9 Number of pulses to dial 9 0x0009 U42 PDBT Pulse dial break time ms units 0x003D U43 PDMT Pulse dial make time ms units 0x0027 U45 PDIT Pulse dial interdigit time ms units 0x0320 U46 DTPL power level 16 bit format is OxXO H L O where H is the 0x09BO dBm level of the high frequency tone and L is the dBm level of the low frequency DTMF tone Note that twist may be specified here U47 DTNT on time ms units 0x0064 U48 DTMF off time ms units 0x0064 U49 Ring frequency high Maximum frequency ring to be considered a valid ring 0 0022 RGFH 2400 maximum ring frequency U4A RGFD Ring delta 0x007A B 1 1 Gs ring freq ring freq col U4B Ring cadence minimum ON time in seconds multiplied by 2400 0x0258 U4C RGNX Ring cadenc
66. ion in OCD will activate INT X result code is generated in command mode 10 PPDM Parallel Phone Detect Mask 0 Change in PPD does not affect INT 1 A low to high transition in PPD will activate INT 9 RIM Ring Indicator 0 Change in RI does not affect INT 1 A low to high transition in RI activates INT 8 Carrier Detect Mask 0 Change in DCD does not affect INT 1 A high to low transition DCD 070 bit 0 which indicates loss of carrier activates INT 7 Reserved Must be set to zero 6 5 Reserved Read returns zero 4 CID Caller ID sticky Caller ID preamble has been detected data will soon follow Clears on read 3 OCD Overcurrent Detect sticky Overcurrent condition has occurred Clears on read 2 PPD Parallel Phone Detect sticky Parallel phone detected since last off hook event Clears on read 1 RI Ring Indicator Active high bit when the Si2457 34 15 04 is on hook indicates ring event has occurred Clears on read 0 DCD Data Carrier Detect status PEU Active high bit indicates carrier detected equivalent to inverse of DCD pin 56 Rev 1 0 SILICON LABORATORIES i2457 34 15 04 U71 101 Bit D15 D14 013 D12 D11 D10 D9 07 06 05 D4 D3 D2 D1 DO Name COMP PRT Type R W R W Reset settings 0x0000
67. l port parallel port or telephone line before enter ing low power sleep mode This feature is disabled if the timer is set to 0 30 Disconnect Activity Timer Sets the length of time that 0 0 255 minutes the modem stays online before disconnecting with no activity on the serial port parallel port or telephone line Ring hookswitch flash or caller ID This feature is disabled if set to O 38 Hang Up Delay Time Maximum delay between 20 0 255 seconds receipt of ATHO command and hang up If time out occurs before all data can be sent the NO CARRIER 3 result code is sent operates in V 42 mode only OK response is sent if all data is transmitted before timeout S38 255 disables timeout and modem dis connects only if data is successfully sent or carrier is lost 40 Data Pattern Data pattern generated during amp T4 and 0 0 2 amp T5 transmit tests 0 All spaces 0s 1 All marks 1s 2 Random data 41 V 34 symbol rate Symbol rate for V 34 when using the 0 0 5 amp T4 and amp T5 commands 0 2400 symbols second 1 2743 symbols second 2 2800 symbols second 3 3000 symbols second 4 3200 symbols second 5 3429 symbols second A valid combination of symbol rate S41 and data rate amp G must be selected Symbol Rate Allowable Data Rates 2400 2400 21600 2743 4800 26400 2800 4800 26400 3000 4800 28800 3200 4800 31200 3429 4800 33600 40 Rev 1 0 s
68. ler ID information The Si2493 will display VCDIR followed by raw caller ID information including checksum 28 Rev 1 0 e SILICON LABORATORIES i2457 34 15 04 4 20 Extended AT Commands The extended AT commands are supported by the Si2457 34 15 04 and are described in Tables 11 through 13 Table 11 Extended AT amp Command Set Command Defaults in Bold Command Action amp Display AT amp current settings amp DO ESC is not used amp D1 ESC escapes to command mode from data mode if also enabled by HES 070 bit 15 amp D2 ESC assertion during a modem connection causes the modem to go on hook and return to com mand mode amp D3 ESC assertion causes ATZ command reset and return OK result code amp F Restore factory default settings amp Gn Line connection rate limit This command sets an upper limit on the line speed that the Si2457 34 15 04 can connect Note that the amp Hn commands may limit the line speed as well amp Gn not used for amp amp H1 Not all modulations support rates given by amp G Any improper setting will be ignored amp G3 1200 bps max amp G4 2400 bps max default for Si2404 amp G5 4 8 kbps max amp G6 7 2 kbps max amp G7 9 6 kbps max amp G8 12 kbps max amp G9 14 4 kbps max default for Si2415 amp G10 16 8 kbps max amp G11 19 2 kbps max amp G12 21
69. llel bus data bit 2 in parallel mode 22 ESC D3 Escape Data Bit Hardware escape in serial mode Bidirectional parallel bus data bit 3 in parallel mode 23 DCD D4 Carrier Detect Data Bit Active low carrier detect in serial mode Bidirectional parallel bus data bit 4 in par allel mode 24 SDO EECLK D5 Serial Data Out EEPROM Clock Data Bit 5 Serial Data Out from codec input in serial mode Clock output for SPI EEPROM in serial mode when pin 4 is pulled low during power up Bidirectional parallel bus data bit 5 in parallel mode 68 Rev 1 0 s SILICON LABORATORIES i2457 34 15 04 10 Pin Descriptions Si3018 10 Si3018 10 QEL 1e 16 JDCT2 2 15 IGND RX 3 14 DCT3 IB 4 13 5 12 QE2 C2B 6 11 sc 7 10 2 RNG4 18 9 RNG2 Table 18 Si3018 Pin Descriptions Pin 2 Pin Name Description 1 QE Transistor Emitter Connects to the emitter of Q3 2 DCT DC Termination Provides dc termination to the telephone network 3 RX Receive Input Serves as the receive side input from the telephone network 4 IB Internal Bias Provides a bias voltage to the device 5 C1B Isolation Capacitor 1B Connects to one side of isolation capacitor C1 and communicates with the system side 6 C2B Isolation Capacitor 2B Connects to one side of isolation
70. modem alerts the host of the condition via the INT pin LVCS BITS 15 10 5 0 0 3 6 9 12 15 18 21 24 28 30 33 36 39 42 45 47 51 54 57 60 63 66 69 72 75 78 81 84 87 100 Loop Voltage V Figure 7 Loop Voltage amp 18 Rev 1 0 6 gt SILICON LABORATORIES i2457 34 15 04 30 25 20 CTR21 only Tha LVCS BITS 0 Overload 4 0 3 6 9 121518 21 24 27 30 33 36 39 424548 51 54 57 60 63 66 69 72 75 78 81 84 87 90 93 140 Loop Current mA Figure 8 Loop Current 4 13 Overcurrent Detection 512457 34 15 04 includes an overcurrent detection feature that measures the loop current at a programmable time after the Si2457 34 15 04 goes off hook This allows the Si2457 34 15 04 to detect if it is connected to an improper telephone line The overcurrent detection feature may be enabled by setting the OCDM bit U70 bit 11 OHT U77 bits 8 0 sets the delay after off hook until the loop current is measured See AN93 Modem Designer s Guide for details 4 14 Global Operation 512457 34 15 04 chipset contains an integrated silicon direct access arrangement Silicon DAA that provides a programmable line interface to meet international telephone line interface requirements AN93 Modem Designer s Guide gives the DAA register settings required to meet international PTT standards Additionally the user access registers via the AT U and AT R commands may be programmed for co
71. nsuc cessful the MNP protocol is attempted If unsuccessful wire mode is attempted WA V 42 LAPM reliable mode or drop call Same as N3 except that the Si2457 34 15 04 drops the call instead of connecting in MNP or wire mode N5 V 42 and MNP reliable mode The Si2457 34 15 04 attempts to connect with V 42 If unsuccessful MNP is attempted If MNP us unsuccessful the call is dropped Pn Parity type will be automatically set in autobaud mode Space P2 Odd P3 Mark Qn Modem to DTE flow control Q0 Disable all flow control This may only be used if the DTE speed and the VF speed are guaranteed to match throughout the call Q2 Use CTS only Notes 1 When in autobaud mode BO B1 and P1 will not be detected automatically The combination of B2 and P3 will be detected This is compatible with seven data bits no parity two stop bits Seven data bits no parity one stop bit may be forced by sending AT T17 B1 2 The autobaud feature does not detect this rate e Rev 1 0 33 SILICON LABORATORIES i2457 34 15 04 Table 13 Extended AT Command Set Command Defaults in Bold Continued Command Action Q3 Use RTS CTS Q4 Use XON XOFF flow control for modem to DTE interface Does not enable modem to modem flow control Tn DTE rate Change DTE rate When the 512457 34 15 04 is configur
72. oratories assumes no responsibility for errors and omissions and disclaims responsibility for any consequences resulting from the use of information included herein Additionally Silicon Laboratories assumes no responsibility for the functioning of undescribed features or parameters Silicon Laboratories reserves the right to make changes without further notice Silicon Laboratories makes no warranty rep resentation or guarantee regarding the suitability of its products for any particular purpose nor does Silicon Laboratories assume any liability arising out of the application or use of any product or circuit and specifically disclaims any and all liability including without limitation conse quential or incidental damages Silicon Laboratories products are not designed intended or authorized for use in applications intended to support or sustain life or for any other application in which the failure of the Silicon Laboratories product could create a situation where per sonal injury or death may occur Should Buyer purchase or use Silicon Laboratories products for any such unintended or unauthorized ap plication Buyer shall indemnify and hold Silicon Laboratories harmless against all claims and damages Silicon Laboratories Silicon Labs and ISOmodem are registered trademarks of Silicon Laboratories Inc Other products or brandnames mentioned herein are trademarks or registered trademarks of their respective holders 74 Rev 1 0 SILICO
73. own PDN 1 80 Note All inputs at 0 or Vp All inputs held static except clock and all outputs unloaded Static lour 0 mA amp e Rev 1 0 SILICON LABORATORIES i2457 34 15 04 Table 4 AC Characteristics Vp 3 0 to 3 6 V TA 0 to 70 C for F Grade Fs 8 kHz Parameter Test Condition Sample Rate Clock Input Frequency default Clock Input Frequency gt 10 kO resistor between DCD and GND Receive Frequency Response Low 3 dBFS Corner FILT 0 Receive Frequency Response Low 3 dBFS Corner FILT 1 Transmit Full Scale Level Receive Full Scale Level Dynamic Range DR ILIM 0 DCV 11 MINI 00 DCR 0 100 mA Dynamic Range DR ILIM 0 DCV 00 MINI 11 DCR 0 20 mA Dynamic Range DR ILIM 1 DCV 11 MINI 00 DCR 0 50 mA Transmit Total Harmonic Distortion THD ILIM 0 DCV 11 MINI 00 DCR 0 100 mA Transmit Total Harmonic Distortion THD ILIM 0 DCV 00 MINI 11 DCR 0 20 mA Receive Total Harmonic Distortion THD ILIM 0 DCV 00 MINI 11 DCR 0 20 mA Receive Total Harmonic Distortion THD ILIM 1 DCV 11 MINI 00 DCR 0 50 mA Dynamic Range Caller ID Mode VIN 1 kHz 13 dBm Measured at TIP and RING with 600 Q termination at 1 kHz as shown in F
74. pid integration into existing modem applications by providing a serial interface that can directly communicate to either a microcontroller via a UART interface or a PC via an RS 232 port This interface allows for PC evaluation of the 4 1 Serial Interface The Si2457 34 15 04 supports asynchronous serial communication with data terminal equipment DTE at rates up to 307 2 kbps with the standard serial UART format Upon powerup the UART baud rate is automatically detected using the autobaud feature The serial interface also provides a hardware pin DCD data carrier detect which remains low as long as the ISOmodem is connected The INT interrupt pin can be programmed to alert the host of changes to the interrupts listed in I O Control 0 U70 To ensure backward compatibility when using a 24 pin system side option if a pulldown resistor lt 10 is placed between D2 Si2457 34 15 04 pin 18 and GND Si2457 34 15 04 pin 6 the DTE rate is set to a 19 2 kbps baud rate see Table 8 4 1 1 Autobaud The Si2457 34 15 04 includes an automatic baud rate detection feature that allows the host to start transmitting data at any standard DTE rate from 300 bps to 307 2 kbps This feature is enabled by default 4 2 Parallel Interface 24 Pin Version Only The 512457 34 15 04 digital can communicate via a parallel interface The parallel interface is an 8 bit data bus with a single bit address Figure 3 on page 9 shows the
75. rcuit 1 Enables digital loopback mode across isolation barrier only Clear after test is termintated 0 Reserved Must be set to 0 s Rev 1 0 49 SILICON LABORATORIES i2457 34 15 04 U63 DAAC3 Bit D15 014 013 D12 011 010 D9 07 D6 D5 D4 D3 02 DO LCS 7 0 ACT 3 0 Type R W Reset settings 0x0003 Bit Name Function 15 8 LCS 7 0 Off Hook Loop Current 1 1 mA bit 7 4 ACT 3 0 Termination Select ACT 3 0 AC Termination 0000 Real 600 0011 220 820 Q 120 nF and 220 Q 820 115 nF 0100 370 620 O 310 nF 1111 Global complex impedance 3 0 Reserved Read returns 0x3 U65 DAAC4 Bit D15 014 013 D12 D11 010 09 D7 D6 D5 D4 D3 D2 D1 DO Name PWMG PDN PDL Type RW RW R W Reset settings Bit Name Function 15 Reserved Read returns zero 14 PWMG PWM Gain 0 No gain 1 6 dB gain applied to AOUT 13 PDN Powerdown Completely powerdown the Si2457 34 15 04 and Si3018 Once set to 1 the Si2457 34 15 04 must be reset to power on 0 Normal 1 Powerdown 12 8 Reserved Read returns zero 7 5 Reserved Must not change in a read modify write 4 PDL Powerdown Line Side Chip 0 Normal operation
76. registers are identified by a hexidecimal hex address Table 16 U Register Description Register Name Description Default U00 DT1AO DT1 registers set the coefficients for stage 1 of the Dial Tone Detect filter 0x0800 Default is for FCC countries See AN93 Modem Designer s Guide for other U01 DT1B1 country settings 0x0000 U02 DT1B2 0x0000 U03 DT1A2 0x0000 U04 DT1A1 0x0000 U05 DT2A0 tone detect filters stage 2 biquad coefficients 0 00 0 006 DT2B1 Ox6EF1 U07 DT2B2 OxC4F4 U08 DT2A2 0xC000 U09 DT2A1 0x0000 DT3AO tone detect filters stage 3 biquad coefficients 0 00 0 UOB DT3B1 0x78B0 07382 0xC305 UOD DT3A2 0x4000 UOE DT3A1 0xB50A UOF DT4A0 _ Dial tone detect filters stage 4 biquad coefficients 0x0400 U10 DT4B1 0 7002 011 DT4B2 0xC830 U12 DT4A2 0x4000 U13 DT4A1 0 80 2 014 DTK Dial tone detect filter output scaler 0x0009 U15 Dial tone detect ON threshold 0 00 0 016 DTOF Dial tone detect OFF threshold 0x0070 amp 42 Rev 1 0 e SILICON LABORATORIES i2457 34 15 04 Table 16 U Register Description Continued Register Description Default U17 BT1AO registers set
77. required timing for the parallel interface If AO 0 the data bus represents a read write to the Parallel Interface 0 0x00 register on page page 64 If 1 the data bus represents a read write to the Parallel Interface 1 0x01 register on page page 65 Selection of a serial or parallel I O interface is determined by the state of AOUT INT Si2457 34 15 04 pin 15 during the rising edge of RESET An internal pullup resistor forces the default state to serial mode operation An external 10 kQ pulldown resistor can be connected to AOUT INT to force selection of parallel mode see Table 8 Configuration of pins 3 4 8 11 15 18 and 22 24 is determined by this interface selection modem immediately upon powerup via the AT commands using standard terminal software 16 Rev 1 0 SILICON LABORATORIES i2457 34 15 04 Table 8 Pulldown Selector 24 Pin SSD Serial I O Parallel I O 4 9152 MHz CLK 27 MHz CLK Autobaud Default Pin 15 Pin 23 Pin 11 15 Default N A 19 2 kbps DTE Pin 18 No EEPROM Default N A EEPROM Pin 4 Table 9 Pulldown Selector 16 Pin Version Weds Senso 4 9152 MHz CLK Default 27 MHz CLK Pin 15 4 3 Command Mode Upon reset the ISOmodem is in command mode and accepts AT commands An outgoing modem call can be made using the ATDT tone dial or ATDP pulse dial command after the device is configured If the handshake is success
78. s is a bit mapped register OxXF20 U6F PTMR _ This bit mapped register 0 00 070 100 This is a bit mapped register 0x2700 U71 101 This is a bit mapped register 0x0000 U76 GEN1 This is a bit mapped register 0x3240 U77 GEN2 This is a bit mapped register 0x401E U78 GEN3 _ This is a bit mapped register 0x0000 U79 is a bit mapped register Ox00XX U7A GENA This is a bit mapped register 0x0000 U83 NOLN _ No Line threshold If V1 is set NOLN sets the threshold for determination of 0 0001 line present vs line not present U84 LIUS Line in use threshold If 1 is set LIUS sets the threshold for determination 0 0007 of line in use vs line not in use U85 NLIU Line in use No line threshold If 99 V2 is set sets the threshold reference 0x0000 for the adaptive algorithm see V2 U86 V9AGG 90 rate adjustment for Japan 1333 BPS units 0x0000 e Rev 1 0 45 SILICON LABORATORIES i2457 34 15 04 Table 16 U Register Description Continued Register Description Default U87 SAM This is a bit mapped register 0x0000 U9F SASF SAS frequency detection See AN93 Modem Designer s Guide for complete 0x0000 details UAO SCO SAS cadence 0 Sets the duration of the first SAS tone ms 0x001E UA1 SC1 SAS cadence 1 Sets the duration of the first SAS silence ms 0x0000 UA2 SC2 SAS cadence 2 Sets the duration of the second SAS
79. scape into command mode Data is also demodulated as in ANALOOP and any bit errors are counted to be displayed after the test using amp TO amp T6 Compute checksum for firmware upgradeable section of program memory If no firmware upgrade is installed amp T6 returns 0x4474 amp Xn Automatic determination of telephone line type amp X0 Abort amp x1 or amp x2 command 30 Rev 1 0 e SILICON LABORATORIES i2457 34 15 04 Table 11 Extended AT amp Command Set Command Defaults in Bold Continued Command Action amp 1 Automatic determination of telephone line type Result code WXYZn W 0 line supports dialing 1 7 line is pulse dial only X 0 line supports 20 pps dialing 1 line supports 10 pps dialing only Y 0 extension network present PBX 1 outside line PSTN connected directly Z 0 7 continuous dialtone 1 make break dialtone n 0 9 number required for outside line if Y O Note The initial number attempted for an outside line is controlled in S51 amp X2 Same as amp X1 but Y result PBX is not tested Produce a constant answer tone ITU T and return to command mode The answer tone continues until the ATH command is received or the S7 timer expires amp Z Enter low power wake on ring mode Table 12 Extended AT Command Set Command Defaults in Bold Command Action 96 Display AT command
80. settings B Report blacklist See also S42 register Cn Data compression 0 Disable V 42bis and MNP5 data compression 1 Enable V 42bis in transmit and receive paths If MNP is selected N2 then C1 enables MNP5 in transmit and receive paths 2 Enable V 42bis transmit path only C3 Enable V 42bis in receive path only Answer mode 01 Si2457 34 15 04 will auto answer a call in answer mode 02 Si2457 34 15 04 will auto answer a call in originate mode Vn Automatic Line Status Detection After the V1 and V2 commands are issued the Si2457 34 15 04 will automatically check the telephone connection for whether or not a line is present If a line is present the Si2457 34 15 04 will automatically check if the line is already in use Finally the Si2457 34 15 04 will check line status both before going off hook and again before dialing 99 V1 uses the fixed method and V2 uses the adaptive method 96 VO default disables this feature 0 Disable automatic line in use detection s Rev 1 0 31 SILICON LABORATORIES i2457 34 15 04 Table 12 Extended AT Command Set Command Defaults in Bold Continued Command Action 1 Automatic Line Status Detection Fixed Method Description Before going off hook with the ATD ATO ATA commands the 512457 34 15 04 com pares the line voltage via LVCS to registers NOLN U83 and LIUS U84 Loop Voltage Action 0 lt LVCS lt
81. sing continued for 2 bytes after carrier is lost 62 Rev 1 0 SILICON LAB DRATORIES i2457 34 15 04 U87 SAM Bit D15 D14 013 012 D11 D10 D7 06 05 D4 D3 D2 D1 DO Name MINT SERM FSMS XMTT 7 0 Type RW RW RN R W Reset settings 0x0000 Bit Name Function 15 11 Reserved Reads returns to zero 10 MINT Minimal Transparency 0 Generates two byte lt EM gt transparency sequences This option will use codes lt EM gt lt T5 gt through lt EM gt lt T20 gt if possible for received data containing two back to back bytes requiring transparency 1 Generates one byte lt EM gt transparency sequences This option will only use codes lt EM gt lt T1 gt through lt EM gt lt T4 gt for received data 9 SERM Special Error Reporting Mode 0 Ignore unrecognized in band commands 1 Generate lt EM gt lt 0x45 gt E for error in response to any unrecognized in band com mands 8 FSMS Framed Sub Mode Startup 0 Upon successful connection enter Transport Sub Mode An lt EM gt lt FLAG gt is required to enter Framed Sub Mode 1 Upon successful connection immediately enter Framed Sub Mode The first received lt EM gt lt err gt from a successful hunt is transformed into an lt EM gt lt flag gt 7 0 XMTT 7 0 Transmitter
82. the coefficients for stage 1 of the Busy Tone Detect filter 0x0800 SOEN Mp tne countries See AN93 Modem Designer s Guide for other Ger U19 BT1B2 0x0000 U1A BT1A2 0x0000 U1B BT1A1 0x0000 U1C BT2AO Busy tone detect filter stage 2 biquad coefficients 0 00 0 010 2 1 Ox6EF1 U1E BT2B2 OxC4F4 U1F BT2A2 0xC000 U20 BT2A1 0x0000 U21 BT3AO Busy tone detect filter stage 3 biquad coefficients 0x00A0 U22 BT3B1 0x78B0 U23 BT3B2 0xC305 U24 BT3A2 0x4000 U25 BT3A1 0xB50A U26 Busy tone detect filter stage 4 biquad coefficients 0x0400 U27 BT4B1 0 7002 028 BT4B2 0xC830 U29 BT4A2 0x4000 U2A BT4A1 0 80 2 U2B BTK Busy tone detect filter output scaler 0x0009 U2C BTON Busy tone detect ON threshold 0x00A0 U2D BTOF Busy tone detect OFF threshold 0x0070 U2E BMTT Busy cadence minimum total time in seconds multiplied by 7200 0x0870 See AN93 Modem Designer s Guide for details U2F BDLT Busy cadence delta in seconds multiplied by 7200 25 8 U30 Busy cadence minimum on time in seconds multiplied by 7200 0x0438 U31 RMTT Ringback cadence minimum total time in seconds multiplied by 7200 0x4650 U32 RDLT Ringback cadence delta in seconds multiplied by 7200 OxEF10 e Rev 1 0 43 SILICON LABORATORIES i2457 34 15 04 Table 16 U Register Description Continued Register Description Default U33 Ringback cadence minimum on time
83. tone ms 0x0000 UA3 SC3 SAS cadence 3 Sets the duration of the second SAS silence ms 0x0000 UA4 5 4 SAS cadence 4 Sets the duration of the third SAS tone ms 0x0000 5 5 5 SAS cadence 5 Sets the duration of the third SAS silence ms 0x0000 UAG SC6 SAS cadence 6 Sets the duration of the fourth SAS tone ms 0x0000 UAT SC SAS cadence 7 Sets the duration of the fourth SAS silence ms 0x0000 UA8 SC8 SAS cadence 8 Sets the duration of the fifth SAS tone ms 0x0000 9 SC9 SAS cadence 9 Sets the duration of the fifth SAS silence ms 0x0000 UAA V29MODE This is a bit mapped register 0x0000 46 Rev 1 0 e SILICON LABORATORIES i2457 34 15 04 Table 17 Bit Mapped U Register Summary Reg Name Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit 15 14 13 12 11 40 9 8 7 6 5 4 3 2 1 0 U4D MOD1 TOCT NHFP NHFD CLPD FTP SPDM GT18 GT55 CTE 053 MOD2 REV U62 DAAC1 OHS2 FOH DL U63 DAAC3 LCS 7 0 ACT 3 0 U65 DAAC4 PWMG PDN PDL 066 DAAC5 FDT U67 ITC1 MINI 1 0 ILIM DCR OHS DCV 1 0 RZ RT U68 ITC2 BTE ROV BTD U6A ITC4 OVL U6C LVS LVS 7 0 U6E CK1 R1 4 0 U6F PTME PTMR 7 0 U70 100 HES TES CIDM OCDM PPDM RIM DCDM CID
84. untry specific settings such as dial tone ring ringback and busy tone See AN93 Modem Designer s Guide for complete details 4 15 Firmware Upgrades The Si2457 34 15 04 contains an on chip program ROM that includes the firmware required for the features listed in this data sheet In addition the Si2457 34 15 04 contains on chip program RAM to accommodate minor changes to the ROM firmware This allows Silicon Labs to provide future firmware updates to optimize the characteristics of new modem designs and those already deployed in the field See AN93 Modem Designer s Guide for complete details 4 16 SMS MMS Support The Si2457 34 15 04 supports V 23 half duplex modulation This modulation provides the low level functionality needed for SMS and MMS protocols See AN93 Modem Designer s Guide for complete details 4 17 Codec Interface 24 Pin Version Only In order to support a full range of voice and data applications the Si2457 34 15 04 includes an optional serial interface that connects to an external voice codec Si3000 See AN93 Modem Designer s Guide for complete details SILICON LABORATORIES Rev 1 0 19 i2457 34 15 04 4 18 EEPROM Interface 24 Pin Version Only The Si2457 34 15 04 supports optional serial peripheral interface SPI bus serial EEPROM Mode 3 with a 16 bit 8 64 kbit range address Upon powerup if a pulldown resistor lt 10 kQ is placed between D6 5
85. z 2400 Hz 1 Hz Mark 980 Hz 12 Hz Space 1180 Hz 12 Hz Mark 1650 Hz 12 Hz Space 1850 Hz 12 Hz Mark 1270 Hz 12 Hz Space 1070 Hz 12 Hz Mark 2225 Hz 12 Hz Space 2025 Hz 12 Hz Output Level Permissive Switched network 9 dBm maximum Notes 1 Supported on Si2457 only 2 Supported on Si2457 and Si2434 only 3 Supported on Si2457 Si2434 and Si2415 only 14 Rev 1 0 SILICON LABORATORIES i2457 34 15 04 Table 7 Protocol Characteristics Continued Item Specification Receive Carrier ITU T van ITU T V 34 ITU T V 32bis ITU T V 323 ITU T V 29 ITU T V 22 V 22bis Bell 212A Originate mode Answer mode ITU T V 21 Originate mode Answer mode Bell 103 Originate mode Answer mode As specified by ITU T As specified by ITU T 1800 Hz 7 Hz 1800 Hz 7 Hz 1700 Hz 7 Hz 2400 Hz 7 Hz 1200 Hz 7 Hz Mark 980 Hz 12 Hz Space 1180 Hz 12 Hz Mark 1650 Hz 12 Hz Space 1850 Hz 12 Hz Mark 2225 Hz 12 Hz Space 2025 Hz 12 Hz Mark 1270 Hz 12 Hz Space 1070 Hz 12 Hz Carrier Detect level for ITU T V 22bis V 22 V 21 212 103 in Switched Network Acquisition 43 dBm Release 48 dBm Hysteresis 2 dBm minimum Note ITU T 901 V 342 V 32 V 32bis are echo canceling protocols that use signal quality as criteria for maintaining connection They also provide for self training detection to force disconnect DTE Interfa

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