V8600A Hardware Manual
Contents
1. Do D7 STATUS REGISTER RD TXD RXD SERIAL CTS SEN POWER ON DETECTION RES WR RAM CONTROLLER INPUT BUFFER AUDIO BUFFER LINE TTS CONVERTER PHONEME TABLES EXCEPTION DICT SP sP SYNC BUSY ACK STBY Vcc GND RC SYSTEMS V8600A VOICE SYNTHESIZER ABSOLUTE MAXIMUM RATINGS TEST CIRCUIT Supply voltage Vcc n eee 0 3 V to 6 5 V 5V DC input voltage Vi 0 3 V to Veo 0 3 V Operating temperature TA 0 C to 70 C Storage temperature Ts tStresses greater than those listed under Absolute Maximum Ratings may cause niy ate S 14 permanent damage to the device This is a stress rating only operation of the device at any condition above those indicated in the operational sections of these specifications is i V8600A not implied Exposure to absolute maximum rating conditions for extended periods may i5 82 affect device reliability o STBY SP S2 GND 24 Pressing S1 then S2 for lt 0 25 sec causes message to be spoken DC CHARACTERISTICS Ta 0 C to 70 C Voc 5 V 10 Symbol Parameter Min Typ Max Unit Test Conditions VIL Input voltage Low 0 3 0 8 V VIH Input voltage High 2 8 Voc 0 3 V VHYR Input hysterisis RES 0 2 1 8 V VoL Output voltage Low Do D7 0 3 V loL 6 mA All other outputs 0 5 V loL 2 mA VoH Output voltage High Do D7 Vcc 0 5 V2. gt lt tyuwo twwr WR tpwB gt Note 1 BUSY CTS ACK tows applies to the BUSY and CTS pins and RDY status flag gt twak RC SYSTEMS V8600A VOICE SYNTHESIZER TIMING DIAGRAMS CONT D Reset twrs RES tpRR INTERFACING THE V8600A The V8600A includes microprocessor bus printer and serial in terfaces Detailed schematics illustrating their uses are shown in the Application Examples Microprocessor Bus Interface In the microprocessor bus configuration the V8600A is con nected to the microprocessor in the same manner as a static RAM The microprocessor s read and write signals control all transactions with the V8600A over the system data bus The CS signal is derived from the system s address decoding logic The V8600A can also be mapped into the system s I O space in a similar manner Prior to each write to the V8600A the host processor should read the V8600A s status by performing a read operation RD Low The definition of each status bit is described below V8600A Status Bits D7 De Ds D4 D3 Do D4 Do C pe Powe Por oe oe ow TYPICAL INTERFACES SYNC The SYNC bit has the same meaning as the SYNC pin When set to 1 it means that the V8600A is producing output SYNC drops to 0 immediately after output has ceased RDY The RDY bit has the opposite meaning of the BUSY pin When RDY is set to 1 the V8600A is ready to accept dat
3. 16 VO PORT ADDRESS S as DECODING LOGIC u3 no 48 1 2 74LS32 swi a7 IOR Big low Bis GND DT B3 B29 45V 3 R z 10 uF 1 uF 10 RC SYSTEMS V8600A VOICE SYNTHESIZER APPLICATION EXAMPLES CONT D Stand Alone Synthesizer This circuit shows how a complete stand alone synthesizer can be constructed using only the V8600A and two inexpensive sup port chips a MAX202 a low cost version of the industry standard MAX232 to convert the serial RS 232C signal levels to and from TTL levels and a Texas Instruments TPS7350Q to provide the regulated 5 V supply and system reset signal The synthesizer can be connected to virtually any source via the serial or parallel ports provided Because the TPS7350Q has very low quiescent STAND ALONE SYNTHESIZER current and dropout voltage 85 mV at 100 mA and constantly monitors the output voltage this circuit is ideal for battery pow ered applications The 68 ohm resistor at the headphone jack provides balance be tween relative speaker volume and headphone volume It also improves headphone S N ratio provides short circuit protection and gives wider useful dynamic range of the volume control REMOTE VOLUME CONTROL OPTIONAL U3 V8600A OUT SENSE RES U2 TPS7350Q REGULATOR SUPER VISORY C
4. DESCRIPTION The V8600A is a complete self contained text to speech system It can be interfaced to a microprocessor bus like a static RAM or I O port connected directly to a PC s parallel printer port or with appropriate signal conditioning to an RS 232 serial port Operating the V8600A is simply a matter of writing or printing if connected to a printer port the text that is to be spoken to the V8600A Software commands that control voice attributes such as speed and pitch are issued the same way allowing them to be embedded in text for dynamic control of the speech output Refer to the V8600A Block Diagram for the following functional description Data Register This is an eight bit register into which ASCII text commands tone generator and PCM data are written from the parallel Data Bus Dop D7 A host microprocessor can write data to this register by placing the data on the Data Bus and asserting the WR signal Data is latched on the rising trailing edge of WR Status Register This eight bit register contains the V8600A status flags The host can read this register over the Data Bus by asserting the RD signal Serial Port The Serial Port provides a bidirectional link between the V8600A and serial devices such as a computer s RS 232 port This allows the V8600A to be remotely located such as ina stand alone synthesizer The Serial Port operates with 8 data bits 1 or more stop bits no parity and any standard
5. baud rate be tween 300 and 115200 bps The V8600A determines which baud BLOCK DIAGRAM rate to use by measuring the duration of the shortest High or Low period of the first character received on the RXD pin The baud rate can also be optionally strapped using three jumpers on the V8600A PCB See Fixed baud rate option for details Controller The controller is responsible for processing text and commands from the host and converting input text into speech Tone generation and O port flow control are also performed by the controller ROM The ROM contains the internal operating system and text to speech algorithms Some of the ROM is re writable and used for storing pre recorded PCM encoded speech user dictionary and custom settings RAM A 4K x 8 volatile static RAM provides storage for the input text buffer and a 1K audio sample buffer for the DAC and tone generators Approximately 2K bytes are available for the input buffer DAC LPF An eight bit digital to analog converter converts the digital speech samples from the Controller into a low level analog signal which is presented to the input of an antialiasing four pole low pass filter LPF The filter cutoff frequency is nominally 3 5 kHz Amp The amplifier takes the smoothed signal from the LPF and boosts the power to a level sufficient to drive an 8 ohm speaker High efficiency and noise rejection are achieved with the bridge tied load output configuration
6. command LINE can also be used as a remote volume control input see Application Example Remote Volume Control SP SP Speaker output analog These pins provide a fil tered differential audio signal capable of driving 500 mW into an 8 ohm speaker The output power is a function of both the volume control setting and Volume command The SP output is AC coupled allowing ground referenced loads to be connected be tween SP and ground at one fourth the power however since the effective output voltage is cut in half Both pins go into a high impedance state when the V8600A is idle or asleep ACK Acknowledge output active Low This pin produces a 9 Us low going pulse after each successful write operation over the Data Bus If the input buffer becomes full as a result of the last write operation the Acknowledge pulse will not occur until room be comes available ACK is inactive when using the serial port BUSY Busy output active High This pin is Low when the V8600A is able to accept data from the host BUSY goes High momentarily after each write operation over the Data Bus ac knowledging receipt of each character If the input buffer be comes full as a result of the last write operation BUSY will remain High until room becomes available TXD Transmit Data output active High This pin transfers serial data to the host least significant bit LSB first RXD Receive Data input active High The V8600A re
7. loH 6 mA All other outputs Vcc 0 5 V loH 2 mA liL Input current Low Do D7 10 uA VI 0V All other inputs 120 uA Vi 0V liH Input current High 10 uA VI Vcc loz Output leakage current Do D7 5 uA VI 0 to Vcc RL Output load impedance SP SP 8 Q Pout Speaker peak output power 500 mW RL 8Q Icc Supply current All outputs open Active 22 55 mA all inputs Vcc Idle 1 3 mA Sleep Standby 50 100 uA RC SYSTEMS V8600A VOICE SYNTHESIZER AC CHARACTERISTICS Ta 0 C to 70 C Voc 5 V 10 Symbol Parameter Min Typ Max Unit Test Conditions tpRV RD 1 to Data valid delay 25 61 ns DRZ RD t to Data float delay 23 61 ns tspw Data setup to WR T delay 25 ns tHwD Data hold from WR t delay 5 ns twwrR WR pulse width 250 ns tpwB WR t to BUSYT CTS 1T delay 15 us Note 1 twak ACK pulse width 9 us twRs RESET pulse width 3 us After Vcc stable 2 DRR RESET recovery delay 2 ms Note 3 Applies to the BUSY and CTS pins and RDY status flag Reset timings apply only when Reset is driven from an external source The V8600A contains an internal power on reset circuit thus Reset may be left unconnected V8600A performs internal initialization all logic outputs will be floating except ACK which will be High and the status flags undefined Do not attempt to send data to the V8600A during this period TIMING DIAGRAMS Read Write RD
8. to a telephone line The XE0068 is an FCC Part 68 approved tele phone line interface available from Xecom 408 945 6640 The PCB layout should employ power and ground planes to minimize coupling of switching noise in the audio path PHONE LINE INTERFACE or 5V Additional circuitry omitted for clarity RJ11C YOR 7 JACK RING V8600A D V GND OH 13 14 21 A 22 sync 1 SEIZE LINE 0 RELEASE LINE 18 108 ia of 26 tip XMIT f SP XE0068 TE i ai DAA tn RC SYSTEMS V8600A VOICE SYNTHESIZER APPLICATION EXAMPLES CONT D ISA Bus Synthesizer A PC compatible ISA bus synthesizer can be constructed using the V8600A and a small amount of glue logic In this implementa tion the board is mapped into the system as an IO port Switch bank SW1 selects the I O address the board will use DBO a pat lt gt pez lt gt D83 lt gt DB4 DBs lt _ gt DB6 lt _ gt DB7 lt _ gt RESET u1 Ae 74ALS520 a DOs Pt MD j REMOTE VOLUME A26 8 CONTROL OPTIONAL a oy fet CONTROL OPTIONAL A25 FF 3 Ae gt a alei ug Ar as E P5 1 6 74LS04 vo oes ss fal A22 17 8 ot ae o Att 1 19 BD SEL ji e pio j a E V8600A ie sl o 8 8 6 2 6715 514 Ta SPEAKER EP aes PHONES as 5 oo 12 12 ou ies alr 11 14 1 C io
9. IRCUIT DB 25 2 do O75 D1 4 4 D2 ore D3 oF PARALLEL PRINTER DECT PORT D5 oF a 06 oF D7 STB BUSY ACK SLCT ERROR C4 PE GND WR BUSY ACK u1 MAX202 DB 9 3 2 13 12 TXD 2 3 RXD e T lt 19 SERIAL 5 7 8 9 RS 232C PORT GND oo 8 5 USE cTs 6 E lt i STRAIGHT THRU CABLE 6 6 1 uF DSR H 1uF v e j is 7 4 C1 RTS H 15 3 oy GND Aw L DENOTE 4 c24 v 2 CONNECTIONS FOR DB25 CONNECTOR 5 c2 VCC 25s 1pF TANT OUT 16 5V 3 iy TL 4 5 2 10 VDC 100mA O IN ApS 11 RC SYSTEMS V8600A VOICE SYNTHESIZER MECHANICAL DATA All connections to the V8600A are made through two standard 12 The V8600A may be secured to the host board with self locking pin socket strips The socket strips mate with any of the popular nylon standoffs or threaded spacers at the four corner mounting 0 025 square post headers with 0 100 center pin spacing The hole locations posts generally can be of any height necessary to provide clear ance between the V8600A and components on the host PCB All socket contacts are gold plated MODULE DIMENSIONS lt 4 250 lt 3 850 gt lt 3 700 gt x A 0 fi 0 100 2 700 COMPONENT 2 300 SIDE 4 i j 0 156 DIA 4 PL y ALL DIMENSIONS gt amp 0 200 TYP 0 275 gt lt IN INCHES 0 200 TYP SOCKET STRIP SAMTEC SSQ 112 01 G S O
10. R EQUIV 0 080 0 250 INSERTION DEPTH J TOME NERT 0 340 oe E E a i fF 0 062 0 080 MAX 12 RC SYSTEMS V8600A VOICE SYNTHESIZER COMPARISON OF THE V8600A AND V8600 V8601 I O pins Pin 23 STBY multifunction standby test TEST perform self test Pin 22 SYNC set clear automatic programmable polarity SYNC automatic active High only Pin 21 Renamed CTS Clear to Send DTR Data Terminal Ready Pin 20 SEN Serial Enable DSR Data Set Ready Input buffer 2 0K V8600 2 7K V8601 26K Exception dictionary 16K non volatile Note internal format of dictionary has changed V8600 dictionaries must be recompiled V8600 2 7K volatile shared with input buffer V8601 26K non volatile shared with input buffer User settable defaults Non volatile user definable default settings and greeting message V8600 none V8601 default settings only Recorded sound Up to 130 seconds None Baud rate selection Automatic programmable or jumper selectable Automatic only RS 232 transceiver External or on board External only Performancet Significantly more responsive entire voice speed range increased Status obtainable via serial portt Speech start s Speech stop t Buffer almost empty lt 100 bytes Buffer almost full gt 1900 bytes f Baud rate lock confirmatio
11. RC SYSTEMS V8600A VOICE SYNTHESIZER V8600A CMOS 5 Volt only Voice Synthesizer Module FEATURES APPLICATIONS e High speech quality unlimited vocabulary Robotics Converts any ASCII text into speech automatically Talking OCR systems e Add modify messages by simply editing a text file Talking e mail telecommunications Remote diagnostic reporting Industrial controllers Electronic test and measurement Security and warning systems Aids for the orally or visually disabled e Requires only a single 5 V supply and speaker e User programmable greeting and default settings e Flexible exception dictionary support e 2KB input buffer e Software control of all voice parameters e Real time and pre recorded playback of sound files e Three voice musical tone generator GENERAL DESCRIPTION The V8600A is a full featured voice synthesizer based on RC Sys Die Snusoidal generator tems DoubleTalk RC8650 chipset The V8600A automatically e DTMF Touch Tone dialer converts plain English ASCII text into a high quality male voice e CMOS design TTL compatible inputs and outputs Only a 5 V power supply and speaker are needed for operation e Low power The V8600A is designed to be piggy backed onto a host PCB 110 mW typ active such as a system s controller board via two 12 pin headers An 5 mW typ idle eight bit bidirectional data bus and read write control pins enable 250 uW typ standby the V8600A to be easily interfaced to virtually a
12. a RDY drops to O momentarily after each write operation over the Data Bus acknowledging receipt of each character AF This bit is set to 1 when less than 100 bytes are available in the input buffer indicating that the buffer is almost full AF is always O in the PCM modes and when using the musical tone generator AE This bit is set to 1 when less than 100 bytes are remaining in the input buffer indicating that the buffer is almost empty AE is always 1 in the PCM modes and when using the musical tone generator STBY This bit is set to 1 when the V8600A is in Standby mode V8600A PRINTER PORT STB Do D7 ACK BUSY Microprocessor Printer Port RS232C LINE V8600A DRVR RCVR V8600A PS RXD TXD RS 232 Serial RC SYSTEMS V8600A VOICE SYNTHESIZER The flowchart below illustrates the recommended method of writ ing data to the V8600A s microprocessor interface This method should be used for writing all types of data including text com mands tone generator and real time audio data Note from the AC Characteristics that the V8600A can take up to 15 us tpwe for each byte to be accepted Because of this it is imperative that the driver wait for RDY to drop to 0 after each byte is written The reason for this is to avoid overwriting the byte just written the next time the routine is called which can result in the loss of data Waiting for RDY to drop to O ensures that it will no
13. ceives se rial data from the host on this pin LSB first RXD contains an inter nal pull up resistor and may be left unconnected SEN Serial Enable input active High This pin is used to enable the optional RS 232 transceiver chip on the V8600A PCB see RS 232 transceiver option Setting this pin Low will power down the transceiver chip reducing overall power consumption SEN may be left unconnected if the transceiver option is not installed CTS Clear to Send output active Low This pin is Low when the V8600A is able to accept data from the host CTS goes High momentarily after a character is received via the RXD pin ac knowledging receipt of each character If the input buffer be comes full as a result of the last character received CTS will remain High until room becomes available SYNC Sync output active High This pin is normally High when the V8600A is active producing output It can be used to control external devices such as a transmitter or telephone DAA SYNC is driven by the on board RC8650 s TS pin thus its polarity and state can be programmed with the RC8650 s TS Pin Control command Refer to the Double Talk RC8650 Chipset User s Manual for further details STBY Standby input active Low This is a dual function pin that can be used to put the V8600A in Standby mode or initialize its internal memory Driving STBY Low for 250 ms or longer causes the V8600A to enter Standby mode All port hand
14. ghts of third parties by or arising from use of devices described herein Nor does RC Systems warrant or represent that any license either express or implied is granted under any patent right copyright or other intellectual property right of RC Systems covering or relating to any combination machine or process in which such devices might be or are used RC Systems products are not intended for use in medical life saving or life sustaining applications Applications described in this publication are for illustrative purposes only and RC Systems makes no warranties or representations that the devices described herein will be suitable for such applications RC SYSTEMS 1609 England Avenue Everett WA 98203 Phone 425 355 3800 Fax 425 355 1098 Internet http www rcsys com
15. n I Sleep mode confirmation p e Speech start B Speech stop E Baud rate lock confirmation L Sleep mode confirmation S Parameter high low limits Wrap or saturate programmable Wrap only Enter Sleep mode Sleep timer or STBY pin Sleep timer only Exit RES or STBY pins RES pin only Power supply tolerance 5V 10 5 V 45 Supply current typ Active 22 mA 48 mA Idle 1 mA 15 mA Sleep 50 pA 50 pA Upgrades updates Via PC serial port Must replace EPROM t In V8600 Compatibility Mode the default the V8600A uses the V8600 speed range and status responses Specifications written in this publication are believed to be accurate but are not guaranteed to be entirely free of error RC Systems reserves the right to make changes in the devices or the device specifications described in this publication without notice RC Systems advises its customers to obtain the latest version of device specifications to verify before placing orders that the information being relied upon by the customer is current In the absence of written agreement to the contrary RC Systems assumes no liability relating to the sale and or use of RC Systems products including fitness for a particular purpose merchantability for RC Systems applications assistance customer s product design or infringement of patents or copyri
16. ny microprocessor oe bus Stand alone applications are also possible with the V8600A s e Three built in interfaces built in printer and serial ports Microprocessor bus a f For additional information about using and programming the Asynchronous serial port V8600A please refer to the DoubleTalk RC8650 Chipset User s Parallel printer port Manual available from htto Avww rcsys com LOGIC SYMBOL PIN CONFIGURATION Do D7 GND STBY SYNC CTS SEN RXD TXD BUSY ACK SP SP LINE CONTROL OUTPUT uP INTERFACE RD gt wre PARALLEL ACK PORT BUSY COMPONENT SIDE TXD ANALOG SERIAL RXD OUTPUTS 1 2 3 4 5 6 7 8 PORT CTS SEN oOo0oo0oo000000000 Vcc GND RES STBY O O O O O O Q O O O O oO V8600A Hardware Manual Rev B1 1999 2001 RC Systems Incorporated Revised 2 21 02 RC SYSTEMS V8600A VOICE SYNTHESIZER PIN DEFINITIONS VCC Power Supply Voltage 5 V 10 DO D7 Data Bus input output active High 3 state These pins form an eight bit bidirectional data bus between the V8600A and the host When WR is Low the Data Bus is placed in the input mode host gt V8600A When RD is Low the bus is placed in the output mode V8600A gt host When RD is High the Data Bus is held in the high impedance state RES Reset input active Low A Low on this pin forces a hard ware reset speech production i
17. on can be either automatic or jumper selectable In this configuration the host system simply outputs the ASCII text to be spoken to the V8600A Because the V8600A s serial port I O pins operate at TTL levels the addition of at most two RS 232 line drivers and one receiver will be necessary if the host system operates at RS 232 voltage levels Numerous 5 V only transceiver chips are available that generate the 10 V RS 232 voltage levels from the system s 5 V supply See RS 232 transceiver option for more information Baud rate detection The V8600A includes an automatic baud rate detection mecha nism enabling it to operate at any standard baud rate between 300 and 115200 bps The baud rate is determined from the first character received on the RXD pin based on the shortest High or Low period detected in the input stream This period is assumed to be the bit rate of the incoming data In order for the V8600A to determine the incoming baud rate there must be at least one isolated 1 or O in the input character The CR character ODh is recommended for locking the V8600A s baud rate The character is not otherwise processed by the V8600A it is discarded If the measured bit period corresponds with a valid baud rate the V8600A transmits the ASCII character L on the TXD pin provid ing acknowledgment of lock acquisition BAUD RATE DETECTION TIMING Start bit F a S l CTS Baud rate
18. rocontroller and microprocessor serial ports If an RS 232 connection is required such as to a PC s U101 communications port an RS 232 transceiver is required to con vert the 0 5 V levels of the V8600A to the 10 V voltage levels of the RS 232 port The transceiver may be located on the board to which the V8600A is mounted or on the V8600A PCB itself TA IFA I AEA The V8600A supports four of the more popular RS 232 transceiver chips The industry standards MAX202 or MAX232A are the most 2 3 2 3 2 3 300 economical choices but neither can be shut down through the 2 3 2 3 1 2 600 V8600A s SEN pin For power sensitive applications the MAX222 2 3 1 2 2 3 1200 or MAX242 should be used because they can be shut down via 2 3 1 2 1 2 2400 the SEN pin All transceiver chips require that C101 through C105 1 2 23 2 3 4800 be installed 1 2 23 1 2 9600 1 2 1 2 2 3 19200 1 2 1 2 1 2 Automatic default SPEAKER CONSIDERATIONS An often taken for granted component of voice synthesis systems is the speaker Considering how greatly the overall sound quality can be affected by the size and quality of the speaker used it is usually prudent to test several different speakers under actual op erating conditions before making a final selection Medium size 3 to 5 speakers are ideal for speech reproduction while smaller speakers such as the common 2 garden variety type suffer from lack of sufficient bass response to accura
19. s immediately halted the input buffer is cleared and the status flags and voice parameters vol ume speed pitch etc are reset to their power up states As shown in the Block Diagram the V8600A contains an internal power on reset POR circuit allowing the Reset pin to be left un connected in most applications Because the POR circuit drives the Reset pin through a 47K resistor it will not contend with exter nal circuitry connected to the Reset pin Caution If external volt ages are present on one or more of the V8600A s pins before Voc is applied therefore exceeding the maximum V p rating the inter nal POR circuit may not operate reliably In this case RES must be driven from an external source RD Read input active Low This pin is used to transfer V8600A status information to the host via the Data Bus A Low gates the status onto the Data Bus and turns on the output drivers RD contains an internal pull up resistor and may be left unconnected WR Write input active Low This pin is used to transfer data to the V8600A via the Data Bus The contents of the Data Bus are written to the V8600A at the rising edge of Write WR contains an internal pull up resistor and may be left unconnected LINE Line output analog This pin supplies a low level audio signal suitable for connection to an external low pass filter power amplifier circuit The output amplitude is a function of both the volume control setting and Volume
20. shake lines are driven to their false not ready states and the V8600A draws minimum current 50 pA typ During standby the V8600A is not able to respond to any input pin except STBY and RES Returning STBY High causes the V8600A to enter Idle mode 1 mA typ drain the hand shake lines are re asserted and the V8600A is able to accept input again If the V8600A entered standby due to a Sleep Timer event driving this pin Low for 250 ns or longer then High will return the V8600A to Idle mode If the V8600A is not in Standby mode driving STBY Low for less than 250 ms initializes the V8600A s internal memory Any excep tion dictionary loaded and or greeting message is erased and all voice parameters are reset to their factory default settings The V8600A then announces its version number via the Speaker and Line pins In order to maintain backward compatibility with the V8600 STBY contains a dynamic pull up resistor If STBY is not used it may be left unconnected If STBY is used to enter Standy mode the internal pullup resistor is automatically disconnected from the pin during standby to reduce overall current drain STBY must be driven High to exit Standby mode it should not be al lowed to float The pullup resistor is automatically reconnected once Idle mode has been re established GND Ground ground reference This pin must be connected to system ground RC SYSTEMS V8600A VOICE SYNTHESIZER FUNCTIONAL
21. t falsely show that the V8600A is ready for another byte the next time the output routine is called If a system interrupt can occur while waiting for RDY to become 0 or if RDY cannot otherwise be checked at least once every 8 us a software timeout should be enforced to avoid hanging up in the wait loop The time RDY stays 0 is relatively short 8 us min and can be missed if interrupted The timeout should be at least 15 us which is the maximum time for RDY to drop to 0 after writing a byte of data In non time critical applications the output routine could simply delay 15 us or longer before exiting without checking for RDY O at all MICROPROCESSOR DRIVER FLOWCHART YES WRITE BYTE TO V8600A READ STATUS REGISTER WRITE COMPLETE NO Printer Interface In the printer port configuration the STB output from the PC s printer port connects directly to the V8600A s WR pin The V8600A s ACK and BUSY outputs serve as handshaking signals with the PC It is not usually necessary to utilize both handshaking signals as they essentially convey the same information BUSY is used by convention In this configuration the host PC simply prints the ASCII text to be spoken to the V8600A Serial Interface The V8600A s asynchronous serial port enables the V8600A to be used with a microprocessor or PC s communications port This port operates with 8 data bits 1 or more stop bits and no parity Baud rate selecti
22. tely reproduce the speech signal If room permits in your application use a high quality speaker with good low end response Adding baffling around the speaker can also help Don t overlook the Tone control nX command built into the V8600A If you must use a small speaker setting the Tone to the bass setting OX can help pick up the slack of the poor low end response of the speaker RC SYSTEMS V8600A VOICE SYNTHESIZER APPLICATION EXAMPLES Driving Single Ended Loads Single ended ground referenced loads may be driven directly from the V8600A s SP pin However a noticeable click may be present when speech begins and ends The circuit shown here will help minimize this effect by keeping the SP pin biased at Vec 2 The value of C will depend on the impedance of the load 100 uF minimum for 8 ohm loads DRIVING SINGLE ENDED LOADS SP NC 47K LOAD V8600A z i i m j M Remote Volume Control Although the V8600A has no provision for an off board volume control one can be used by connecting a 10K pot between the Line pin and ground For maximum dynamic range the V8600A volume control should be adjusted fully clockwise REMOTE VOLUME CONTROL FROM DAC VOLUME REMOTE 10K Internal to V8600A For best performance adjust V8600A volume control maximum clockwise Phone Line Interface This is a suggested circuit for applications requiring connection
23. validation 75 ms 7 e TXD RC SYSTEMS V8600A VOICE SYNTHESIZER Note The measurement cycle ends when there have been no PCB SERIAL PORT OPTIONS High to Low nor Low to High transitions on the RXD pin for at least 75 ms Consequently the V8600A will ignore any data sent to it for a period of 75 ms after the lock on character has been received 123 The CTS pin is driven High during this time and the acknowledg ment character is not transmitted until the V8600A is actually I JP3 ready to accept data HO UP2 Fixed baud rate option E O JP1 If automatic baud rate detection is not desired the baud rate may OOOO be set via jumpers JP1 JP2 and JP3 on the V8600A PCB The gt d accompanying table lists the jumper connections for all of the aNORA V8600A s supported baud rates MIN LE a Note The copper trace connecting jumper pins 1 2 must first be cut on the PCB if that jumper is to be changed to pins 2 3 For example to set the baud rate to 9600 cut the trace connecting JP2 pins 1 and 2 and install a jumper between pins 2 and 3 O C101 through C105 are 0 1 uF 0805 nk ceramic chip capacitors U101 may be a o MAX202 232A SO 16 narrow package ol or MAX222 242 SO 18 wide package gt m Copper tracks marked with X must be cut before installing U101 RS 232 transceiver option LI The V8600A s serial port operates at 0 5 V levels which is di rectly compatible with most mic
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