Altec AL7020S User's Manual
Contents
1. 3 The AL7020S is designed the meet the EMC requirements of ETS 300 342 4 When integrating the AL7020S into a system Altec recommends testing the system to ETS300342 1 4 The AL7020S meets the safety requirements of EN60950 5 Systems using the AL7020S are subject to mandatory EMC testing under directive 89 336 EEC see item 3 above Other directives such as the LVD directive 73 23 EE may also apply to a system using the AL7020S module Doc No DG_7024E Altec Electronic AG Seite 30 32 AL7020S AL7024S Designer s Guide 7 2 7 2 1 7 2 2 7 2 3 7 2 4 Safety Precautions Your GSM terminal is based on the GSM standard for cellular technology The GSM standard is spread all over the world It covers Europe Asia and some parts of America and Africa This is the most used telecommunication standard Your GSM terminal is actually a low power radio transmitter and receiver It sends out and receives radio frequency energy When you use your GSM application the cellular system which handles your calls controls both the radio frequency and the power level of your cellular modem User Operation Do not operate your unit when a person is within 8 inches 20 centimeters of the antenna A person or object within 8 inches 20 centimeters of the antenna could impair call quality and may cause the phone to operate at a higher power level than necessary IMPORTANT The unit must be installed in a manner that provides2. 50 uA ILOAD 8 mA max Reset Low Input Voltage pin 24 Parameter Conditions Min Max internally pulled up to VCC by 10kQ SIMDATA Vin lin 20U4A 0 7xSIMVCC SIMDATA Vi 1mA 0 3xSIMVCC Vou Source current 20uUA SIMVCC 0 1V Sink current 200uA SIMVCC Output Voltage Isimvec lt 6mA SIMCLK Rise Fall Time Loaded with 30pF Rise Fall Time Loaded with 30pF SIMCLK Frequency Loaded with 30pF Doc No DG_7024E Altec Electronic AG Seite 13 32 AL7020S AL7024S Designer s Guide Table 3 6 Absolute Maximum Ratings Parameter Supply Voltage Test Condition Input Voltage Nominal Supply Voltage 5V Version 3V Version Static Discharge Voltage 25 C Operating Temperature Range Operational Functional Storage Temperature Range Supply Current GSM 900 Average PCL5 Average PCL10 Average Idle Supply Current GSM 1800 Average PCL5 Average PCL10 Average Idle Notes Test Conditions VCC 5VDC 5 TA 25 C Doc No DG_7024E Altec Electronic AG Seite 14 32 AL7020S AL7024S Designer s Guide 3 4 Antenna Interface RF The AL7020S has two models one for North America Frequency bands 850 1900 MHz and one for European Bands 900 1800 MHz The following connection requirements apply for
3. The AL7020S contains an analog amplifier with a default gain of 22dB which can be adjusted in seven steps between 0 and 31dB using the AT MMICG command For more details about this command refer to the AT Commands document AT_7020A When the default gain of 22dB is used then the level considerations should be as follows Pin 62 is the headset microphone input The input for this line can come directly from a headset microphone The maximum input to the AL7020S headset microphone before there is signal distortion in the network is 12 mvRMS The Microphone ist connected single ended to pin 62 with analog ground at pin 63 At pin 62 there is also a phantom feeding voltage of 2 2 Volts Recommended characteristics for the microphone 2V 0 5mA KOhms Sensitivity 40 to 50dB SNR gt 50dB Frequency response compatible with the GSM specifications 3 8 3 Audio Circuit Design Considerations In order to design an audio circuit that produces clear audio without being affected by the GSM transmission the following guidelines should be considered when designing the circuit e The audio input to the AL7020S should be referenced to the MIC GND line of the Module e The microphone bias of the AL7020S for the microphone is 2 2 V If a microphone with a different voltage is used the bias should be as clean as possible and referenced to MIC GND Because most GSM buzz 217Hz TDMA noise is generated from the microphone path if a diffe
4. 1 DESIGN GUIDELINES Good engineering practices must be adhered to when designing a printed circuit board PCB containing the GSM Socket Modem module Suppression of noise is essential to the proper operation and performance of the modem itself and for surrounding equipment Two aspects of noise in an OEM board design containing the GSM Socket Modem module must be considered on board off board generated noise that can affect analog signal levels and analog to digital conversion ADC digital to analog conversion DAC and on board generated noise that can radiate off board Both on board and off board generated noise that is coupled on board can affect interfacing signal levels and quality especially in low level analog signals Of particular concern is noise in frequency ranges affecting modem performance On board generated electromagnetic interference EMI noise that can be radiated or conducted off board is a separate but equally important concern This noise can affect the operation of surrounding equipment Most local governing agencies have stringent certification requirements that must be met for use in specific environments Proper PC board layout component placement signal routing trace thickness and geometry etc component selection composition value and tolerance interface connections and shielding are required for the board design to achieve desired modem performance and to attain EMI certification Electromagn
5. 25 32 AL7020S AL7024S Designer s Guide 6 Locate cables and connectors so as to avoid coupling from high frequency circuits 7 Ifa mulilayer board design is used make no cuts in the ground or power planes and be sure the ground plane covers all traces 8 Minimize the number of through hole connections on traces carrying high frequency signals 9 Avoid right angle turns on high frequency traces Forty five degree corners are good however radius turns are better Grounding Pins 26 and 41 are for grounding Connect all of them to the same ground layer or a big ground area on your board The ground area should completely cover the area below and around the module and the regulator Make the connections as wide as possible For better RF perfomance connect the metal housing to ground very near the ground pins of the module Power Supply 5V 5V Models A power supply with 5 0V DC 5 5V models and a minimum power of 1 5A is strictly required to supply this module The supply regulator should be placed as close to the module as possible about 5cm or nearer The 5V trace between regulator and module should be at least 2 5mm wide or better an entire layer Important The module draws up to 1 3A max for 577us every 4 6ms at GSM transmit level PCL5 2W Therefore a regulator with fast transient response and good load regulation is strongly recommended TEJE l j STOP Peak 1 3A ME E E tft aja dear
6. 32 AL7020S AL7024S Designer s Guide 3 6 SIM Card Mechanical Drawings SIM CARD DRAWINGS TOP VIEW FRONT VIEW Doc No DG_7024E Altec Electronic AG Seite 18 32 AL7020S AL7024S Designer s Guide 3 7 External SIM Card Interface ES Option 4 signals exist e SIMVCC SIM power supply e SIMRST reset e SIMCLK clock SIMDATA I O port The SIM interface controls a 3V SIM This interface is fully compliant with GSM 11 11 recommendations concerning SIM functions It is recommended to add Transient Voltage Suppressor diodes on the signal connected to the SIM socket in order to prevent any Electrostatic Discharge TVS diodes with low capacitance less than 10pF have to be connected on SIMCLK and SIMDATA to avoid any disturbance of the rising and falling edge These types of diodes are mandatory for the Full Type Approval They shall be placed as close as possible to the SIM socket 3 7 1 External SIM Card reader pins supported Signal Pin number NO I O type Description SIMCLK 32 O 2X SIM Clock SIMRST 31 O 2X SIM Reset SIMDATA 30 1 0 CMOS 3X SIM DATA SIMVCC 28 O SIM Power Supply 3 7 2 SIM socket pin description Signal Pin Number Description VCC 1 SIMVCC RST 2 SIMRST CLK 3 SIMCLK CC4 4 VCC module Not connected GND 5 GROUND VPP 6 Not connected 1 0 7 SIMD
7. 7 1 2 Reguiatory Stale GIN traidos ci ais dicte iuhcadatacdatauiesiAcnetes 30 SA A AN 31 7 2 1 User Operan aid 31 7 22 Ante na lnstallatioms rien a a E a E 31 7 2 3 Antenna care and replacement s sssrsrrrrrrrrtrtrrrrrrrrrrtrnttrnttrntttttttttttrtrerennt 31 7 2 4 Electronic devices vincia aaa a iio 31 8 ARPENDI A td aut gta colon iaa cado 32 8 1 REFERENCE DOCUMENTS cuisine aid 32 Doc No DG_7024E Altec Electronic AG Seite 3 32 AL7020S AL7024S Designer s Guide List of Tables amp Figures Table Gal senal TIL ION Sd e a cds a 9 Table 3 2 Signal Descriptions oooccoocccociconiccnnnconcccc cir nrcnr 10 Table 3 3 Signal Descriptions Cont arios ii ias 11 Table 3 3 Signal Descriptions Contd oooooccccconinnncconancconnnnnnnnnnnnrrncnnerennnnnnnnnrne nenas 12 Table 3 4 Analog Electrical CharacteristiCS oooooooncndnddinnninnnnnncnoccnoccnnccnnnnnnnnnnnnnnnnnnnnnninnninnn 12 Table 3 5 Digital Electrical Characteristics ooooooncccninininnninnnnnnnnnnnnnnccnn 13 Table 3 6 Absolute Maximum Ratings ooooocooccononnnninncnncccncnonnnnnn cnn 14 Table 3 7 Antenna Performance Recommendations eseeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeees 16 Table 3 8 Headset Speaker Output at Maximum Volume Level cccccceeeeeeeeeeeeeeeeeeeees 21 FIGURE 2 1 INTERFACE BLOCK DIAGRAM cuac adidas 7 FIGURE 3 1 SERIAL PINOU TT Sui ia 9 FIGURE 3 5 SIM CARD READER oc rtoncodo odo dm ihe Abe oe
8. Designer s Guide 5 1 5 RF Antenna Antenna sub system and integration in the application is a major issue Attention should be paid to e Choice of the antenna cable type length performance thermal resistance etc e Antenna connector type losses These elements could affect GSM performances such as sensitivity and emitted power e The antenna should be isolated as much as possible from the digital circuitry including the interface signals e Itis strongly recommended to shield the terminal e On terminals including the antenna a poor shielding could dramatically affect the sensitivity of the terminal Moreover the power emitted through the antenna could affect the application Warning Altec Electronic strongly recommends to work with an antenna manufacturer either to develop an antenna adapted to the application or to adapt an existing solution to the application The antenna adaptation mechanical and electrical adaptation is one of the key issues in the design of a GSM terminal The antenna cable and the antenna should be as far as possible away from other circuitry specially switching regulators analog and uC digital circuits It is recommended to place the antenna jack near a metal enclosure and go through this one with the antenna cable 5 2 Manufacturing Considerations The Socket Modem has been designed to be mounted onto the host board in one of two ways The first method consists of soldering two 32
9. Do not operate your unit when a person is within 8 inches 20 centimeters of the antenna A person or object within 8 inches 20 centimeters of the antenna could impair call quality and may cause the phone to operate at a higher power level than necessary IMPORTANT The unit must be installed in a manner that provides a minimum separation distance of 20 cm or more between the antenna and persons to satisfy FCC RF exposure requirements for mobile transmitting devices IMPORTANT To comply with the FCC RF exposure limits and satisfy the categorical exclusion requirements for mobile transmitters the following requirements must be met Doc No DG_7024E Altec Electronic AG Seite 16 32 AL7020S AL7024S Designer s Guide 3 5 Internal SIM Card Interface The AL7020S module has a built in SIM card reader within the module itself see figure 3 5 The SIM card is inserted into the slot provided on the side of the connectors bottom side The SIM Interface controls a 3V SIM card This interface is fully compliant with GSM 11 11 recommendation concerning SIM functions 3 5 1 SIM Card reader pins supported Signal Pin No I O Description SIMVCC 1 O SIM Power Supply SIMRST 2 O SIM Reset SIMCLK 3 O SIM Clock SIMGND 5 O SIM GND SIMDATA 7 1 0 SIM Data SIMPRES 8 Scene id ne SIM Card Reader Bottom View Figure 3 5 SIM CARD READER Doc No DG_7024E Altec Electronic AG Seite 17
10. a minimum separation distance of 20 cm or more between the antenna and persons to satisfy FCC RF exposure requirements for mobile transmitting devices IMPORTANT To comply with the FCC RF exposure limits and satisfy the categorical exclusion requirements for mobile transmitters the following requirements must be met Antenna Installation A minimum separation distance of 20 cm needs to be maintained between the antenna and all persons The transmitter effective radiated power must be less than 3 0 Watts ERP 4 9 Watts or 36 9 dBm EIRP This requires that the combination of antenna gain and feed line loss does not exceed 16 dBi Antenna care and replacement Do not use the GSM terminal with a damaged antenna If a damaged antenna comes into contact with the skin a minor burn may result Replace a damaged antenna immediately Consult your manual to see if you may change the antenna yourself If so use only a manufacturer approved antenna Otherwise have your antenna repaired by a qualified technician Use only the supplied or approved antenna Unauthorized antennas modifications or attachments could damage the terminal and may contravene local RF emission regulations or invalidate type approval Electronic devices Most electronic equipment for example in hospitals and motor vehicles is shielded from RF energy However RF energy may affect some improperly shielded electronic equipment Doc No DG_7024E Altec Electronic AG Seit
11. jaa jalar Erre jaa jaa pra Current Measurement PCL5 Eran Fad w1CcA1 56 25mY w2 cA1 685 0mvY avcald 628 5mY Doc No DG_7024E Altec Electronic AG Seite 26 32 AL7020S AL7024S Designer s Guide 5 1 3 5 1 4 Power Supply 3 3V 3V Models A power supply with 3 3V 5 3V models and a minimum power of 1A is strictly required to supply this module The supply regulator should be placed as close to the module as possible about 5cm or nearer To keep a short and low impedance connection between the regulator and the module is very important when supplying the module with 3 3V The 3 3V trace between regulator and module should be at least 2 5mm wide or better an entire layer Important The module draws up to 0 8A max for 577us every 4 6ms at GSM transmit level PCL5 2W Therefore a regulator with fast transient response and good load regulation is strongly recommended Peak 0 8 A ae A Current Measurement PCL 5 A A ee he w1CcA1 59 06my V2CA1 425 1mv AYCA1D 369 1mv Preferred Regulators Preferred fast response regulators The following regulators where tested and found to be good MIC29150 Micrel Inc www micrel com LP3852 LP3855 National Semiconductor www national com LM3940 National Semiconductor www national com LTC1778 Linear Technology www linear com Doc No DG_7024E Altec Electronic AG Seite 27 32 AL7020S AL7024S
12. off signal Figure 3 8 On Off Signal Timing Diagram T1 T2 T3 In Figure 3 8 the following timing requirements apply T1 minimum 800 ms T2 minimum 10 seconds T3 minimum 2 seconds Software Reset It is possible to reset the module by software which activates an internal reset generator see AT Commands Reference Manual Doc No DG_7024E Altec Electronic AG Seite 23 32 AL7020S AL7024S Designer s Guide 4 1 4 2 4 3 4 4 4 5 CONNECTORS AND PERIPHERAL REFERENCE RF CONNECTOR RF MMCX comnector and accessories can be obtained from RADIALL http www radiall com AMPHENOL http www amphenol com HUBER amp SUHNER http www hubersuhner com Microphone Possible references e HOSIDEN KUF3323 e HOSIDEN KUF4323 e PANASONIC WM64 Speaker Possible references e SANYO M15X0080 e PHILIPS e PRIMO Antenna Cable The following cable reference has been qualified for being mounted on the AL7020S module e RG178 GSM antenna GSM antennas and support for antenna adaptation can be obtained from manufacturers such as ALLGON http www allgon com e MOTECO http www moteco com AMPHENOL http www amphenol com GALTRONICS http www galtronics com RADIALL LARSEN http www larsenantennas com RANGESTAR http www rangestar com Doc No DG_7024E Altec Electronic AG Seite 24 32 AL7020S AL7024S Designer s Guide 5
13. pin strip sockets to the host board and inserting the Socket Modem into the sockets A suggested part number for the 32 pin socket is Sam Tec SMM 132 01 F S The second way is to solder the Socket Modem directly to the host board The most efficient way to do this is through a wave solder process The recommended hole size for the Socket Modem pins is 0 036 in 0 003 in in diameter Spacers can be used to hold the Socket Modem vertically in place during the wave solder process A spacer should be placed on pin 32 and pin 64 of the Socket Modem A suggested part number for the spacer is BIVAR 938 0 130 for P1 0 310in option Socket Modems The spacers can be left on permanently and will not effect operation Socket Modems can be put through a water wash process Doc No DG_7024E Altec Electronic AG Seite 28 32 AL7020S AL7024S Designer s Guide 6 MODULE DIMENSIONS Top View a 64 5mm O amp 8mm 1 55mm NM 3 4mm 7 0 mm Dimensions in Millimeters Doc No DG_7024E Altec Electronic AG Seite 29 32 AL7020S AL7024S Designer s Guide 7 1 REGULATORY APPROVALS The GSM Socket Modem is approved as a host independent modem module To maintain type approvals permits and or licenses valid the guidelines described in this document must be followed Considerations for Regulatory Approvals The AL7020S Socket Modem has been asse
14. AL7020S AL7024S Designer s Guide GSM Socket Modem AL7020S AL7020S 3V Series AL70245S AL7024S 3V Series Designer s Guide RELEASED 9 JANUARY 2006 AA altec Doc No DG_7024E Altec Electronic AG Seite 1 32 AL7020S AL7024S Designer s Guide Information provided by Altec Electronic AG is believed to be accurate and reliable However no responsibility is assumed by Altec Electronic for its use nor any infringement of patents or other rights of third parties which may result from its use No license is granted by implication or otherwise under any patent rights of Altec other than for circuitry embodied in Altec products Altec Electronic reserves the right to change circuitry at any time without notice This document is subject to change without notice Please read carefully the safety precautions for a terminal based on the AL7020S and AL7024S Socket Modems Product names or services listed in this publication are for identification purposes only and may be trademarks or registered trademarks of their respective companies All other marks mentioned herein are the property of their respective owners 2006 Altec Electronic AG Printed in Switzerland All Rights Reserved Doc No DG_7024E Altec Electronic AG Seite 2 32 AL7020S AL7024S Designer s Guide Table of Contents 1 INTRODUCTION sarta A a eat eae Faas 5 1 4 Models Description eseni ee aa raea EE E E RE E E R E T ans 5 A E E T E T E 5 1 3
15. ATA CC8 8 SIMPRES Not connected GND SIMVCC SIMRST SIMDATA SIMCLK Doc No DG_7024E Altec Electronic AG Seite 19 32 AL7020S AL7024S Designer s Guide 3 7 3 SIM Card Reader Integration SIM interface controls a 3V SIM only We add Transient Voltage Suppressor TVS diodes with low capacitance less than 10pF on signal connected to the SIM socket in order to prevent any Electrostatic Discharge They shall be placed as close as possible to the SIM socket Following references are used DALC208SC6 from ST Microelectronics which will be connected to SIMCLK and SIMDATA ESDA6V1 from ST Microelectronics for the ESD protection of SIMVCC On the board near SIM connector we also add on SIMVCC a 100nF capacitor in parallel as close as possible to the SIM connector to minimize noise Schematic of SIM Interface P1A y A PRES_OUT AIN E PRES IN L8 4 7 vo Ps vPP pz GND P3 CLK P p P2 Poo a SIM CARD READER CHK 62 vec pls SOCKET MODEM D1 ESDA6V1L DALC208SC6 3 7 4 Layout Restrictions For the SIM interface length of the tracks between the GSM modem and the SIM connector should be as short as possible 8cm EMI layout is recommended for SIMCLK signal AND TOT AATUN A r Socket SIM Modem SIMCLK connector SIMRST SIMVCC SIMDATA GND Less than 8 cm Doc No DG_7024E Altec Electronic AG Seite 20 32 AL7020S AL7024S Designer s Guide 3 8
16. Audio Interface 3 8 1 Speaker Circuit Audio output is useful for monitoring the modem s call progress tones and modem system debugging as well as for fullfeatured Voice applications You can directly connect a speaker of 32 to 150 Ohms to pins 63 and 64 The connection is single ended with analog ground at pin 63 Use good shielding of the audio connections as to avoid disturbing performance by entering RF The gain of the SPK output is internally adjusted and can be tuned using an AT command The possible range of output levels is 4mV to 210mV rms max Levels Recommended characteristics for the speaker e Type 10mW electro magnetic e Impedance 32 to 150 Ohms 1nF 32Ohm for headsets 1500hms other applications e Sensitivity SPL 100dB min e Frequency response compatible with the GSM specifications Table 3 8 shows the Speaker output in headset mode for different network signal levels when the g20 is set to the maximum volume level Table 3 8 Headset Speaker Output at Maximum Volume Level Headset mV RMS Speaker mV RMS 3 14 1111 9 174 0 774 6 165 5 435 6 132 10 244 9 72 15 5 130 39 16 122 8 36 17 109 4 32 20 77 5 24 25 43 6 5 30 24 5 4 max 3000 210 Doc No DG_7024E Altec Electronic AG Seite 21 32 AL7020S AL7024S Designer s Guide 3 8 2 Microphone circuit The AL70205 has an analog input referenced to the microphone ground pin 63
17. M 07 07 Motorola proprietary AT commands Accessories Developer Kit Antennas RF Cables Doc No DG_7024E Altec Electronic AG Seite 6 32 AL7020S AL7024S Designer s Guide 2 TECHNICAL OVERVIEW 2 1 Block Diagramm of GSM Module Ant bal Main onver Transmitter IC Processor KOIT gt amp i atl ae 3 o e G Q O g E Audio Management c 2 2 Supported Interfaces The major hardware signal interfaces of the DF Series SocketGSM Modem are illustrated in Figure 1 1 Antenna Serial Interface interf interface Sscikct External SIM GSM Optional Modem Module Speaker Microphone Interface Figure 2 1 Interface Block Diagram The RS232 Interface is connected via eight pins to the module The SIM card is connected via 4 pins to the module The Microphone is connected via 2 pins to the module The Speaker is connected via one pin to the module The Indicators are connected via two pins to the module The power supply is connected via one pin to the module Doc No DG_7024E Altec Electronic AG Seite 7 32 AL7020S AL7024S Designer s Guide 3 HARDWARE INTERFACE 3 1 Interface Signals The Socket Modem pin assignments with DTE serial TTL interface SIM Card and Analog Interface are shown in Figure 3 1 and are listed in Table 3 1 3 2 Signal Description The Socket Modem interface signals are described in Table 3 3 The digital electrical characteristics
18. PFOdUCE SPECIICATIONS ita di is 6 2 TECHNICAL OVER VIEW arieni aaae a iape eas hpo a a AAE AA EAE EAER N EAE EROE r 7 2 1 Block Diagramm of GSM Module cocos odia Manion ii is 7 2 2 Supported Interfaces oococcccccccnccnnnnnnnnnnnnnnnnnnonnnonnnnnnnonnnnnnnonnnnnnnonnnnnnnnnnnnnnnnneneneninens 7 3 HARDWARE INTERFACE ciu as 8 Sol Amerace SIGNALS it al eos tesis 8 3 2 Signal Descriptio Mats enaren e e i AAE TAANA e N Ea SEEEN 8 3 4 Antenna Interface RE Jissie e a aE annie 15 3 4 1 FRE CONNECCION sereine da did 15 3 4 2 Antenna Performance Recommendations ccccceeeeeeeeeeeeteeeeeeteeeeseeeeeeeeeees 16 3 4 3 Antenna Installation cc cece cee eee e eee ee cece cece cent cent cents eee eeeeeseeeeeeeeeeeeeeeeeeeeeeeeeeees 16 3 4 4 WSSrOPCVaAllOn cai cic sees E dao A A EAT 16 3 5 Internal SIM Card Interface ceccccecccee cece cece eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeneeeneeeneeeees 17 3 5 1 SIM Card reader pins SUPPOrted ee cece cece cece cece nc cnn cnn 17 3 6 SIM Card Mechanical Drawings osos ii aabstetede 18 3 7 External SIM Card Interface ES Option ooooonoccnnncccnnnnccccononancconccnncnonannnannnncccnnnnnnnns 19 3 7 1 External SIM Card reader pins Supported oocccccccnncnnnccnnncnnnnnnnnnnnnnnncnnnnnnncnnnnss 19 3 7 2 SIM socket pin des rnption ertsia es cnn cren 19 3 7 3 SIM Card Reader Integration ci leralaneanct rolas does de laten Ales al 20 3 7 4 Layout Restric
19. are listed in Table 3 4 The analog electrical characteristics are listed in Table 3 5 Doc No DG_7024E Altec Electronic AG Seite 8 32 AL7020S AL7024S Designer s Guide POWER AUDIO RESET o SERIAL TTL INTERFACE SIMCLK Notes Pins 3 23 and 42 60 are not installed Figure 3 1 SERIAL PINOUT Table 3 1 Serial TTL Signals PI N NAME I O TYPE PIN NAME I O TYPE 1 NC NC 33 RTSTTL Input 2 NC NC 34 RXDTTL Output 3 No pin 35 TXDTTL Input 4 No pin 36 RITTL Output 5 No pin 37 DSRTTL Output 6 No pin 38 CTSTTL Output 7 No pin 39 DCDTTL Output 8 No pin 40 DTRTTL Input 9 No pin 41 DGND GND Digital 10 No pin 42 No pin 11 No pin 43 No pin 12 No pin 44 No pin 13 No pin 45 No pin 14 No pin 46 No pin 15 No pin 47 No pin 16 No pin 48 No pin 17 No pin 49 No pin 18 No pin 50 No pin 19 No pin 51 No pin 20 No pin 52 No pin 21 No pin 53 No pin 22 No pin 54 No pin 23 No pin 55 No pin 24 RESET Input 56 No pin 25 NC NC 57 No pin 26 DGND GND Digital 58 No pin 27 LED GPRS Output 59 No pin 28 SIMVCC option Output 60 No pin 29 LED GSM Output 61 VCC POWER 5V 30 SIMDATA option Bi directional 62 MICV Input 31 SIMRST option Output 63 AGND GND Analog 32 SIMCLK option Output 64 SPKR Output Doc No DG_7024E Altec Electronic AG Seite 9 32 AL7020S AL7024S Designer s Guide Table 3 2 Signal Descriptions VO Type Signa
20. e 31 32 AL7020S AL7024S Designer s Guide 8 APPENDIXA 8 1 REFERENCE DOCUMENTS GSM ETSI recommendations for Phase and Phase II Specification Reference Title GSM900 1800 1900 ph2 Radio ETSI GSM 05 05 v7 1 0 release 1998 GSM ph2 Link Management ETSI GSM 03 06 04 08 05 05 05 08 05 10 07 01 and GT 01 v4 2 1 GSM ph2 Layer 2 ETSI GSM 04 06 and GT 01 v4 2 1 GSM900 ph2 Layer 3 ETSI GSM 04 08 and GT 01 v4 2 1 GSM1800 ph2 Layer 3 ETSI GSM 04 08 and GT 01 v4 2 1 GSM900 GSM1800 Multiband ETSI GSM 02 07 03 22 04 08 04 13 05 05 05 08 and GT 01 v4 2 1 GSM ph2 SIM ETSI GSM 11 11 and GT 01 v4 2 1 GSM ph2 Teleservices ETSI GSM 03 50 and GT 01 v4 2 1 GSM ph2 Miscellaneous ETSI GSM 02 07 03 40 03 41 04 08 04 10 04 11 06 10 06 11 06 12 06 31 06 32 07 01 09 07 and GT 01 v4 2 1 GSM1800 ph2 Miscellaneous ETSI GSM 02 07 03 40 03 41 04 08 04 10 04 11 06 10 06 11 06 12 06 31 06 32 07 01 09 07 and GT 01 v4 2 1 GSM1900 ph2 EN 300 919 V7 1 0 1999 07 European standard Telecommunications series Digital cellular telecommunications system phase2 Doc No DG_7024E Altec Electronic AG Seite 32 32
21. eristics 64 5 x 26 5 mm Socket a Modem Form Faktor Mounting Through DIL 64 connectors Weight Environmental Operational 20 C 60 C temp Functional temp 30 C 70 C Storage temp 40 C 85 C Operating Voltage covey Current lt 2 5 mA DRXO9 Idle consumption mode 0 8 W 850 MHz Tx power 2 W 900 MHz e 1 W 1800 1900 MHz DIL 64 Header RM2 Connectors lt RF MMCX e Local SIM connectivity SIM Card e 32K SIM 1 8 3 0V BR from 300 bps to 115 a Kbps Serial RS232 Auto BR from 300 bps to 115 Kbps Data Features e Multi slot class 8 10 4 down 2 up E Max BR 85 6 Kbps ida Class B GSM 07 10 multiplexing protocol e Coding scheme CS1 CS4 CSD Max BR 14 4 Kbps MO MT Text and PDU SMS modes e Cell broadcast FAX Class 1 Voice Functions Telephony Digital audio Differential analog audio lines Vocoders EFR ER FR AMR DTMF support Audio control echo cancellation noise suppression side tone and gain control GSM Supplementary Services USSD Phase II Call forwarding Call hold waiting and multiparty Call diverting Missed call indicator AOC Call barring Character Set UTF8 UCS2 Control Status Indicators GPRS coverage Wakeup TX enable Reset Features over RS232 Embedded TCP IP stack STK Class II Emergency and Location FCC E911 Phase II Location Mandate using EOTD AT Command Set GSM 07 05 GS
22. etic Interference EMI Considerations The EMC tests have to be performed as soon as possible on the application to detect any possible problem When designing special attention should be paid to e Possible spurious emission radiated by the application to the RF receiver in the receiver band e Metallic case or plastic casing with conductive paint are recommended The following guidelines are offered to specifically help minimize EMI generation Some of these guidelines are the same as or similar to the general guidelines but are mentioned again to reinforce their importance In order to minimize the contribution of the Socket Modem based design to EMI the designer must understand the major sources of EMI and how to reduce them to acceptable levels 1 Keep traces carrying high frequency signals as short as possible 2 Provide a good ground plane or grid In some cases a multilayer board may be required with full layers for ground and power distribution 3 Decouple power from ground with decoupling capacitors as close to the Socket Modem module power pins as possible 4 Eliminate ground loops which are unexpected current return paths to the power source and ground 5 Locate high frequency circuits in a separate area to minimize capacitive coupling to other circuits Distribute high frequency signals continuously on a single trace rather than several traces radiating from one point Doc No DG_7024E Altec Electronic AG Seite
23. l ALXXXX Series Socket Modems and ISDN Socket TA s allows upgrading and production configurability without hardware changes This designer s guide describes the modem hardware AT commands and S registers are defined in the AT Command Reference Manual As a data modem in CSD mode the AL7020S and AL7024S Socket Modem can receive data at speeds up to 14 4 Kbps and can send data at speeds up to 14 4 Kbps Error correction V 42 maximize data transfer integrity Non error correcting mode is also supported As a fax modem the AL7020S Socket Modem supports Group 3 send and receive rates up to 14 4 kbps and supports Class and T 30 protocols The Socket Modem with Voice features supports Full Rate Enhanced Rate and Half Rate FR EFR HR This mode supports applications such as digital telephone answering machine TAM voice annotation audio recording and playback The AL7020S Socket Modems supports GPRS Class B and multislot classes up to Class 8 with coding shemes CS1 to CS4 The AL7024S Socket Modems supports GPRS Class B and multislot classes up to Class 10 with coding schemes CS1 to CS4 SMS services are supported in both GSM and GPRS modes The GSM Socket Modems are available with internal and external SIM Card Readers Doc No DG_7024E Altec Electronic AG Seite 5 32 AL7020S AL7024S Designer s Guide 1 3 Product Specifications Product Features Operating EGSM 900 1800 MHz systems GSM 850 1900 MHz Physical Charact
24. l Name Description 5 VDC A standard 5V 5 1 5A power supply is strictly required to supply this module 5V Versions Average current is 270mA 350mA PCL5 See also chapter 5 1 2 3 3 VDC A standard 3 3V 5 1A power supply is strictly required to supply this module 3V Versions Average current is 270mA 350mA PCL5 See also chapter 5 1 3 Digital Ground Connect to Digital Ground on the interface circuit Modem Reset ON OFF To be pulled to ground by external transistor for reset on module pull up resistor of 200K The GSM Modem has already an internal power up reset circuit Needs special timing for RESET and ON OFF function see chapter 3 8 Analog Ground if a microphone or headset is used use this as a ground If these are never used it can be connected to DGND OPTIONAL SIM CARD READER INTERFACE Label I O Type Signal Name Description SIM Clock Provided from module SIM Reset Provided from Module to reset the SIM Card SIM Data line Digital bi directional data line to exchange data between module and SIM card SIM Power Supply 3VDC Power Supply provided from module to power the SIM Card Only 3V SIM Cards are supported Doc No DG_7024E Altec Electronic AG Seite 10 32 AL7020S AL7024S Designer s Guide Table 3 3 Signal Descriptions Cont d Label I O Type Signal Name Description The Serial interface signals are TTL level signals Reque
25. lee dea alone tase de ult ca sevubessuvocsuceemecians 17 FIGURE 6 2 MECHANICAL DRAWINGS sac ctaniutei ites sechnn wet cds 29 Doc No DG_7024E Altec Electronic AG Seite 4 32 AL7020S AL7024S Designer s Guide 1 1 1 2 INTRODUCTION Models Description Models Operating Bands Interface Connectors Interfaces Power e DIL 64 Header RM2 e RS232 TTL Level AL7020S Cob OOHBOO MEE MMOX RE Connector e DO Power e DIL 64 Header RM2 e RS232 TTL Level eee Caine ooo Me e MMCX RF Connector e 3 3 VDC Power e RS232 TTL Level e SIM Card Interface e 5 VDC Power e DIL 64 Header RM2 AL7020S ES GSM 900 1800 MHz MMCX RF Connector AL7024S GSM _ 850 900 e DIL 64 Header RM2 e RS232 TTL Level 1800 1900 MHz e MMCX RF Connector e 5 VDC Power RS232 TTL Level GSM 850 900 e DIL 64 Header RM2 i ACIOA AY 1800 1900 MHz MMCX RF Connector SM Card Interface e 5 VDC Power Summary Altec s AL7020S AL7024S Socket Modem provides the OEM with a complete E GSM GPRS 900 1800Mhz or GSM 850 1900Mhz dual band module in a compact socket mountable module The compact size and high level of integration of the Socket Modem minimizes real estate and cost for motherboard and box modem applications Its low power consumption makes it ideal for portable applications such as pocket modems and for a wide variety of embedded control applications The pin compatibility between the full range of al
26. on TXD CTS ON is a response to DTR ON and RTS delayed as may be appropriate for the modem to establish a connection Ring Indicate TTL Active Low RI output ON low indicates the presence of an incoming call Data Set Ready TTL Active Low DSR indicates modem status to the DTE DSR OFF high indicates that the DTE is to disregard all signals appearing on the interchange circuits except Ring Indicator RI Data Carrier Detect TTL Active Low When AT amp CO command is not in effect DCD output is ON when a link is established or OFF when no link is established Data Terminal Ready TTL Active Low The DTR input is turned ON low by the DTE when the DTE is ready to transmit or receive data DTR ON prepares the modem to be connected and maintains the connection established by the DTE manual answering or internally automatic answering DTR OFF places the modem in the disconnect state under control of the amp Dn command The effect of DTR ON and DTR OFF depends on the amp Dn command Doc No DG_7024E Altec Electronic AG Seite 11 32 AL7020S AL7024S Designer s Guide Table 3 3 Signal Descriptions Cont d 1 O Type Signal Name Description LED driver lines are open drain inverter driven 74HCTO5 lines with 1 5 KO 1 10W pull up resistors GSM activity LED active low connect LED to 5V with resistor in series GPRS activity LED active low connect LED to 5V with
27. rent bias is created it should be filtered to supply DC only e The MIC GND and GND are connected inside the module and should not be connected to the application board e Keep the lines of the microphone inputs as short as possible To filter the lines from RF emission 39pF capacitors can be used e The Module GND should be connected on all pins e f possible the RF cable ground from the AL7020S should be connected to the GND of the Module e The digital lines of the application should never be referenced to the MIC GND 63 Doc No DG_7024E Altec Electronic AG Seite 22 32 AL7020S AL7024S Designer s Guide 3 9 3 9 1 Reset Signal ON OFF Signal After power is applied to the AL7020S module the power on process is initiated which lasts about five seconds after which the module is ready to communicate After power on the on off signal is pulled high to the VCC by a 200kQ resistor The module remains active until power is turned off or the power off process is initiated by activating the Reset ON OFF signal The AT interface answers OK to the application when the reset is complete After the AL7020S is turned on the line should be pulled low for a minimum of 2 seconds to turn it off The unit can be turned off only if at least 10 seconds have elapsed since turning it on To turn the AL7020S on again the on off signal should be pulled low for a minimum of 800 ms Figure 3 8 shows the timing diagram for the on
28. resistor in series GSM LED OG GPRS LED OG Audio Headset Interface Microphone Voice Input MICV is a single ended microphone input from the analog switch circuit The maximum input to the MICV pin before there is signal distortion in the network is 12mVRMS Speaker Output SPKR is a single ended output Analog Ground Analog Ground related to MICV Input Notes 1 I O types DA Analog input see Table 3 5 O DD O DF Analog output see Table 3 5 IO DX Analog input output see Table 3 5 Table 3 4 Analog Electrical Characteristics Characteristic Value Recommended characteristics for Impedance 32 Q handset the speaker Power 10mW Sound Pressure 110dB Recommended characteristics for Bias Voltage 2 2V 0 5mA the microphone Impedance 2 KOhms Sensitivity 40 to 50dB SNR gt 50dB Doc No DG_7024E Altec Electronic AG Seite 12 32 AL7020S AL7024S Designer s Guide Parameter Input High Voltage pins 33 35 40 Table 3 5 Digital Electrical Characteristics Test Conditions Input Low Voltage pins 33 35 40 Output High Voltage pins 34 36 37 38 VCC 0 1V 3 8V VCC 4 5V ILOAD 20 uA ILOAD 4 mA Output High Voltage VCC 4 5V pin 39 VCC 0 1 3 8V ILOAD 50 uA ILOAD 8 mA Output Low Voltage pins 34 36 37 38 ILOAD 20 uA ILOAD 4 8 mA Output Low Voltage VCC 4 5V pin 39 ILOAD
29. ssed and has been found to comply with the following regulatory approvals FCC DOC PTCRB R amp TTE EMC GCF Regulatory Requirements The Federal Communications Commission FEC requires application for certification of digital devices in accordance with CFR Title 47 Part 2 and Part 15 This includes Electromagnetic Energy Exposure EME testing As the AL7020S modem is nota standalone transceiver but is an integrated module the AL7020S cannot be tested by itself for EME certification It is however the integrator s responsibility to have the completed device tested for EME certification Regulatory Statement The following safety precautions must be observed during all phases of the operation usage service or repair of any cellular terminal or mobile incorporating the AL7020S module Manufacturers of the cellular terminal are advised to convey the following safety information to users and operating personnel and to incorporate these guidelines into all manuals supplied with the product Failure to comply with these precautions violates safety standards of design manufacture and intended use of the product Altec assumes no liability for customer failure to comply with these precautions 1 The AL7020S must be operated at the voltages described in the technical documentation 2 The AL7020S must not be mechanically nor electrically changed Use of connectors should follow the guidance of the technical documentation
30. st To Send TTL Active Low RTS is used to condition the local modem for data transmission and during half duplex operation to control the direction of data transmission On a full duplex channel RTS OFF maintains the modem in a non transmit mode A non transmit mode does not imply that all GSM signals have been removed from the link RTS OFF may be ignored if the modem is optioned to strap CTS ON this allows the modem to receive from the DTE even though RTS is OFF RTS input ON causes the modem to transmit data on TXD when CTS becomes active Received Data TTL Active Low The modem uses the RXD line to send data received from the telephone line to the DTE and to send modem responses to the DTE Modem responses take priority over incoming data when the two signals are in competition for RXD Transmitted Data TTL Active Low The DTE uses the TXD line to send data to the modem for transmission over the telephone line or to transmit commands to the modem The DTE should hold this circuit in the mark state when no data is being transmitted or during intervals between characters Clear To Send TTL Active Low CTS is controlled by the modem to indicate whether or not the modem is ready to transmit data CTS ON together with the RTS ON DSR ON and DTR ON where implemented indicates to the DTE that signals presented on TXD will be transmitted CTS OFF indicates to the DTE that it should not transfer data across the interface
31. the AL7020S antenna The AL7020S is terminated with an MMCX connector and with 50 ohm impedance in the relevant frequencies e The AL7020S can be connected to any antenna with 50 ohm impedance in the relevant frequency bands e The AL7020S is designed to work on VSWR up to 3 1 The antenna should meet this requirement 3 4 1 RF Connector The Antenna jack of the AL7020S module is an MMCX type It has a snap in connection For the antenna cable RG 178 is recommended RF Connector AL7020S Connector Mating Connector Standard MMCX female Amphenol Standard MMCX male MMCX 6251S5 3GT30G 50 connector for cable gold plated FIGURE 3 4 Antenna Connector Interface Doc No DG_7024E Altec Electronic AG Seite 15 32 AL7020S AL7024S Designer s Guide 3 4 2 Antenna Performance Recommendations Table 3 7 Antenna Performance Recommendations Frequencies GSM 850 e 824 849 Mie GSM 900 e B80 El 2 Me DCS 1800 a 1710 iB JE PCS 1900 le 1830 1500 ie Gain et unity gain or Impedance 50 Ohm bala i copa 3 4 3 Antenna Installation e A minimum separation distance of 20 cm needs to be maintained between the antenna and all persons e The transmitter effective radiated power must be less than 3 0 Watts ERP 4 9 Watts or 36 9 dBm EIRP This requires that the combination of antenna gain and feed line loss does not exceed 16 dBi 3 4 4 User Operation
32. tions csi lola edil II ta dia 20 3 8 Audio Interface mio ibi 21 3 8 1 Speaker Circuit cccccccccccccceeceeeeceeeeeeeceeeseeeecegeceeeeeeeseeeseeeeeeeeeeeeeseeeseeeseeeseeesees 21 3 8 2 Microphone CirCuiboooooooooocooncccnccocncoconoonno non nro 22 3 8 3 Audio Circuit Design Considerations 2 ccccccceeeee cee eeeeenteceeeeneeneeeeeeateensneeees 22 3 9 Reset Signal ONES batata italia 23 3 9 1 Software Reset I ncrs e eei A ER Ea e e A 23 4 CONNECTORS AND PERIPHERAL REFERENCE eccecseeeeeeeeeeeeeeeeeeeeeeeeeeees 24 4 1 RECONNECTOR ratita tanda dao tra pifias 24 4 2 iS ANO 24 4 3 Speaker r a a a cede oleae aaa ea ease aee 24 4 4 Antenna Cable ives iia A A A A AE 24 4 5 GSM antenna erah i hue tae asthe Ai Avid er ee a 24 5 DESIGN GUIDELINES cociente 25 5 1 Electromagnetic Interference EMI Considerations c cceeeeeeeeeeeeeeetnteeeeeeeeeeees 25 5 1 1 A O PEA EE EE ETEA NETT 26 5 1 2 Power Supply 5V 5V Models cto tota drid added duet Ane nat 26 5 1 3 Power Supply 3 3V 3V ModelS ivc coven sion tach elieeees Hees eee thai adden 27 5 1 4 Preferred Regulators ociosos iii 27 5 1 5 PARAG ALn cian aaa 28 5 2 Manufacturing Considerations idea 28 6 MODULE DIMENSIONS srine ardua epa 29 7 REGULATORY APPROVALS ot pido T Rn iiaae 30 7 1 Considerations for Regulatory Approvals oooooonconncccnnnnniccnononcccnnnnnnnnnnnnnnnnnnnoncnnnnnnnns 30 7 1 1 Regulatory Requirements ij dns star tddi 30
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