V8600A User`s Manual
Contents
1. Figure 9 Driving Single Ended Loads Remote Volume Control Although the V8600A has no provision for an off board volume control one can be used by connecting a 10 KQ pot between the Line pin and ground For maximum dynamic range the V8600A volume control should be adjusted fully clockwise FROM DAC INE VOLUME REMOTE 10K TO LPF lt e a a ee g internal to V8600A For best performance adjust V8600A volume control maximum clockwise Figure 10 Remote Volume Control V8600A voice synthesizer Phone Line Interface These circuits can be used in applications requiring connection to a telephone line The circuit in Figure 11 utilizes a Xecom www xecom com XE0068 telephone DAA which provides the interface between the V8600A and telephone network This circuit is ideal for low production quantity applications because the DAA is already FCC Part 68 registered The PCB layout should employ power and ground planes to minimize coupling of switching noise into the audio path Figure 12 is a lower cost implementation using a Xecom XE056J telephone DAA This circuit is well suited for high volume applica tions due to the significantly lower cost DAA The DAA is not FCC registered however so the product utilizing this circuit must be approved and certified by the FCC Additional circuitry omitted for clarity 3 3K V8600A 1 SEIZE LINE 0 RELEASE2. Microcontroller Printer Port RS232C LINE V8600A au DRVR RCVR V8600A RS 232 Serial Figure 5 Typical Interfaces RC Systems now youre talking controllers 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 controller 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 Ds Ds D4 Ds Dp Dy Do Pane Tove ier or oe ow o 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 data RDY drops to 0 momentarily after each write operation over the Data Bus acknowl edging 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 0 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 th
3. 75 ms 7 DEN Figure 7 Baud Rate Detection Timing In order for the V8600A to determine the incoming baud rate there must be at least one isolated 1 or 0 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 is determined to be a valid baud rate the V8600A will acknowledge lock acquisition by transmitting the ASCII character L 4Ch on the TXD pin Note that nothing will be transmitted if the baud rate has been programmed for a fixed rate The baud rate will remain locked unless changed with the baud rate command or the V8600A is reset Note The measurement cycle ends when there have been no 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 The CTS pin is driven High during this time and the acknowledgment character is not transmitted until the V8600A is actually ready to accept data See Figure 7 Fixed baud rate option The baud rate can also be set with jumpers JP1 JP2 and JP3 on the V8600A PCB as shown in Figure 8 For baud rates above 19200 automatic detection must be used or programmed with the RC8650 Baud Rate command Note The copper trace connecting jumper pins 1 2 must first be cut on the PC
4. The V8600A receives serial data from the host on this pin LSB first RXD contains an internal pull up resistor and may be left unconnected SEN Seria 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 acknowl edging receipt of each character If the input buffer becomes 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 RC8650 s TS pin thus its polarity and state can be programmed with the RC8650 s TS Pin Control command Refer to the DoubleTalk RC8650 Chipset Users Manual for further details STBY Standby input active Low A Low on this pin causes the V8600A to enter Standby mode All port handshake lines are driven to their false not ready states and the V8600A draws minimum current 0 8 YA typ During standby the V8600A
5. 8 PCB Serial Port Options 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 operating 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 accurately 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 now youre talking 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 pF minimum for 8 ohm loads 5V 47K SP V8600A sr L5 neo 47K LOAD
6. 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 Flash 1 MB of flash memory contains the internal operating system and text to speech algorithms This memory is also used to store sound files a user dictionary and greeting message RAM 4 KB of static RAM provides 2 KB storage for the input buffer and a 2 KB audio sample buffer for the DAC and tone generators DAC LPF An 8 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 DATA REGISTER STATUS SEN POWER ON DETECTION RES INPUT BUFFER Do D7 AUDIO BUFFER REGISTER RD O LINE TTS CONVERTER SOUND FILE STORAGE TXD EXCEPTION DICTIONARY RXD SERIAL PORT GREETING MESSAGE CTS CONTROLLER SYNC BUSY ACK STBY Voc GND SP O sr
7. 8 Q Pout SP output power 1 W RL 8 Qf 1 kHz lec Supply current Note 1 Active 11 35 mA All outputs open Idle 1 3 mA all inputs Vcc Sleep Standby 0 8 20 UA Program Note 2 40 mA 1 Add 5 mA typ if RS 232 transceiver option is installed 2 Applies during internal programming operations greeting message dictionary sound library and microcode updates RC Systems VsS600A now youre talking voice synthesizer AC CHARACTERISTICS Ta 0 C to 70 C Veg 5 V 10 Symbol Parameter Min Typ Max Unit Test Conditions tprv RD W to Data valid delay 25 61 ns tprz RD T to Data float delay 23 61 ns tspw Data setup to WR T delay 25 ns tuwp Data hold from WR T delay 5 ns twwr RD pulse width Low 250 ns tows WR to BUSY CTS T delay 15 us Note 1 twak ACK pulse width Low 9 Us twrs RES pulse width Low Notes 2 3 After power on Vcc stable 1 ms During operation 3 Us torr RES recovery delay 2 ms Note 4 twsBL STBY pulse width Low To enter Standby mode 5 ms To exit Standby mode Sleep Timer invoked 250 ns 1 Applies to the BUSY and CTS pins and RDY status flag 2 STBY must be High no later than 0 5 sec after RES goes High 3 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 4 V8600A performs internal initialization all outputs will
8. B 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 RS 232 transceiver option The V8600As serial port operates at 0 5 V levels which is directly compatible with most microcontroller serial ports If an RS 232 connection is required such as to a PC s communications port an RS 232 transceiver is required to convert the 0 5 V levels of the V8600A to the 10 V voltage levels of the RS 232 port The trans ceiver may be located on the board to which the V8600A is mounted or on the V8600A PCB itself as shown in Figure 8 The V8600A supports four of the more popular RS 232 transceiver chips The industry standards MAX202 and MAX232A are the most economical choices For power sensitive applications the MAX222 or MAX242 should be used because they can be shut down via the SEN pin In all cases C101 through C105 must be installed 12 3 JP3 JP2 JP1 2299 ooo amp NOORA C101 through C105 are 0 1 pF 0805 ceramic chip capacitors U101 may be a MAX202 232A SO 16 narrow package or MAX222 242 SO 18 wide package Copper tracks marked with X must be cut before installing U101 m E solo U101 JP3 JP2 JP1 Baud Rate 2 3 2 3 2 3 300 2 3 2 3 1 2 600 2 3 1 2 2 3 1200 2 3 1 2 1 2 2400 1 2 2 3 2 3 4800 1 2 2 3 1 2 9600 1 2 1 2 2 3 19200 1 2 1 2 1 2 Auto detect default Figure
9. LINE Figure 11 Phone Line Interface FCC Registered 5v ia Additional circuitry omitted for clarity 1 RINC JACK vog z 3 15 14 o 3 tp T Sps XE056J o4 2 RAA RING 14 15 gp GND OH V8600A 10 12 SYNC 1 RELEASE LINE 0 SEIZE LINE Figure 12 Phone Line Interface FCC Compliant RC Systems now youre talking Vs6G00A 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 voice synthesizer DBO DB1 DB2 DB3 DB4 DB5 DB6 DB7 RESET A3 A5 A6 AT A8 A9 AEN IOR low GND 5V AQ ui 74ALS520 u2 1 6 74LS04 D gt At 1 19 BD SEL Lo a P Q 16 3 Lo Qo 42 ood S gy 14 7 4 3 ie a al 67 39 0 Lel 7 2 2 4 E 7 n 14 Iy w 16 VO PORTADDRESS ka a6 DECODING LOGIC u3 ne 8 1 2 74LS32 a7 B14 E gt B13 B1 B31 pe B3 B29 10 pF AF REMOTE VOLUME CONTROL OPTIONAL SPEAKER PHONES ZL gt 80 Figure 13 ISA Bus Synthesizer RC Systems now youre talking APPLICATION EXAMPLES CONT D Stand Al
10. RC Systems now youre talking V8600A CMOS 5 Volt only Voice Synthesizer Module FEATURES e High speech quality unlimited vocabulary e Converts any ASCII text into speech automatically e Add modify messages by simply editing a text file e Requires only a single 5 V supply and speaker e CMOS design TTL compatible inputs and outputs e User programmable greeting and default settings e Flexible exception dictionary support e 2 KB input buffer for print and forget operation e Software control of all voice parameters e 1 W audio output power directly drives an 8 ohm speaker e Playback of sound files Real time PCM and ADPCM Prerecorded on board up to 2 minutes e Tone generation Three voice musical Dual sinusoidal DTMF Touch Tone dialer e Low power 55 mW typ active 5 mW typ idle 4 uW typ standby e Three built in interfaces Microcontroller bus Asynchronous serial UART port Parallel printer port PIN CONFIGURATION Vcc Do Dt D2 D3 D4 D5 De D7 RES RD WR COMPONENT SIDE 1 2 3 4 5 6 te 8 oo0oo0o000000000 O O O g O O O O O O O O V8600A voice synthesizer COMPLIANT APPLICATIONS e Robotics e Talking OCR systems e ATM machines e Remote diagnostic reporting e Industrial controllers e Vending and ticketing machines e Electronic test and measurement e Security and warnin
11. RC Systems now youre talking ELECTRICAL SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS Supply voltage Veg oeoo ee eee 0 3 V to 6 5 V DC input voltage Vj 00 00 0 3 V to Vcc 0 3 V Operating temperature Ta 0 000008 0 C to 70 C Storage temperature Ts 000 55 C to 125 C WARNING Stresses greater than those listed under Absolute Maximum Ratings may cause 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 specifica tions is not implied Exposure to absolute maximum rating condi tions for extended periods may affect device reliability Vs600A voice synthesizer Figure 1 Test Circuit DC CHARACTERISTICS Ta 0 C to 70 C Veg 5 V 10 Symbol Parameter Min Typ Max Unit Test Conditions VIL Input voltage Low 0 3 0 8 V Vin Input voltage High 2 8 Vec 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 Vec 0 5 V lo4 6 MA All other outputs Vec 0 5 V loH 2 MA liL Input load current Low Do D7 10 HA V 0V All other inputs 120 HA Vi 0V liq Input load current High 10 HA Vi Voc loz Output leakage current Do D7 5 UA Vi 0 to Vec RL Output load impedance SP SP
12. SENSE RES u2 TPS7350Q i REGULATOR SUPER 5 240VDC 100mA O VISORY CIRCUIT Figure 14 Stand Alone Synthesizer RC Systems now youre talking MECHANICAL DATA All connections to the V8600A are made through two standard 12 pin socket strips The socket strips mate with any of the popular 0 025 square post headers with 0 100 center pin spacing The posts generally can be of any height necessary to provide clearance between the V8600A and components on the host PCB All socket contacts are gold plated VsS600A voice synthesizer The V8600A may be secured to the host board with self locking nylon standoffs or threaded spacers at the four corner mounting hole locations lt 4 250 lt 3 850 lt 3 700 SIDE COMPONENT 0 156 DIA 4 PL lt 0 200 TYP 0 200 TYP 0 080 0 INSERTION DEPTH 250 COMPONENT AREA pie ee lt ALL DIMENSIONS 0 275 gt IN INCHES SOCKET STRIP SAMTEC SSQ 112 01 G S OR EQUIV 0 340 i 0 062 0 080 MAX RC Systems now youre talking COMPARISON OF THE V8600A AND V8600 V8601 1 0 pins Pin 23 STBY multifunction standby test Vs600A voice synthesizer TEST perform self test Pin 22 SYNC set clear automatic programmable polarity SYNC
13. TE TO V8600A READ STATUS REGISTER WRITE COMPLETE Figure 6 Recommended Method of Writing Data Via the Microcontroller Bus Interface NO Serial Interface The V8600A s asynchronous Serial port enables the V8600A to be used with a microcontroller or PC s communications port This port operates with 8 data bits LSB first 1 or more stop bits no parity and any standard baud rate between 300 and 115200 bps Baud rate selection 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 mechanism 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 RC Systems now youre talking Vs600A voice synthesizer ria bit f iw rate validation
14. also be used as a remote volume control input see Application Example Remote Volume Control SP SP Speaker output analog These pins provide a filtered differential audio signal capable of delivering up to 1 W into an 8 ohm speaker The output power is a function of both the volume control setting and RC8650 Volume command The SP output is AC coupled allowing ground referenced loads to be connected between 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 op eration the Acknowledge pulse will not occur until room becomes 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 acknowledging receipt of each character If the input buffer becomes full as a result of the Vs600A voice synthesizer 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
15. 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 e Buffer almost full 1900 bytes f Baud rate lock confirmation I Sleep mode confirmation p 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 Sleep mode Enter Sleep timer or STBY pin Sleep timer only Exit RES or STBY pins RES pin o
16. be floating except ACK which will be High and the status flags undefined Do nota TIMING DIAGRAMS lempt to send data to the V8600A during this period twrs RES DRR gt l Figure 2 Reset Waveform e twee gt STBY Figure 3 Standby Waveform RC Systems now yout talking TIMING DIAGRAMS CONT D Vs600A voice synthesizer Do D7 RD WR BUSY CTS ACK tows applies to the BUSY and CTS pins and RDY status flag tows Note 1 mn twak Figure 4 Bus Interface Waveforms INTERFACING THE V8600A The V8600A includes microcontroller bus printer and serial inter faces Detailed schematics illustrating their uses are shown in the Application Examples 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 Microcontroller Bus Interface In the microcontroller bus configuration the V8600A is connected to the microcontroller in the same manner as a Static RAM The V8600A PRINTER PORT STB Do D7 ACK BUSY
17. e PCM modes and when using the musical tone generator STBY This bit is set to 1 when the V8600A is in Standby mode Figure 6 illustrates the recommended method of writing data to the V8600A s microcontroller interface This method should be used for writing all types of data including text commands 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 writ ten the next time the routine is called which can result in the loss of data Waiting for RDY to drop to 0 ensures that it will not falsely show that the V8600A is ready for another byte the next time the output routine is called Ifa 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 the loop is 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 0 at all VsS600A voice synthesizer YES WRITE BY
18. g systems e Aids for the orally or visually disabled e Meeting federal ADA requirements GENERAL DESCRIPTION The V8600A is a full featured voice synthesizer based on RC Systems DoubleTalk RC8650 chipset The V8600A automatically converts plain English ASCII text into a high quality male voice requiring only a 5 V power supply and speaker for operation The V8600A is designed to be piggy backed onto a host PCB such as a system s controller board using two 12 pin headers An 8 bit bidirectional data bus and read write control pins enable the V8600A to be easily interfaced to virtually any microcontroller bus Stand alone applications are also possible with the V8600A s built in printer and serial ports For additional information about using and programming the V8600A please refer to the DoubleTalk RC8650 Chipset User s Manual available from www rcsys com V8600A Hardware Manual Rev 05 Revised 07 10 09 1999 2009 RC Systems Incorporated RC Systems now youre talking PIN DEFINITIONS DO D7 Data Bus input output active High 3 state These pins form an 8 bit bidirectional data bus between the V8600A and the host When WR is Low the Data Bus is placed in the input mode host V8600A When RD is Low the bus is placed in the output mode V8600A 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 hardware reset speech production
19. is immediately halted the input buffer is cleared and the status flags and voice parameters volume 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 47 kQ resistor it will not contend with external circuitry connected to the Reset pin Caution If external voltages are present on the V8600A s pins before Vcc is applied therefore exceeding the maximum Vjy rating the internal 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 sta tus 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 command LINE can
20. is not able to re spond to any input pin except STBY and RES Returning STBY High causes the V8600A to enter Idle mode 1 mA typ drain the handshake lines are re asserted and the V8600A is able to accept input again If the V8600A entered standby due to an RC8650 Sleep Timer event driving this pin Low for 250 ns or longer then High will return the V8600A to Idle mode STBY is also used to restore the V8600A to its factory default set tings To prevent this from happening unintentionally make sure that STBY is High no later than 0 5 sec after RES goes High See Appendix A Restore Mode in the DoubleTalk RC8650 Users Manual for additional information STBY contains a dynamic pull up resistor allowing the pin to be left unconnected if it is not used If STBY is used the internal pullup resistor is automatically disconnected from the pin when the pin is driven Low in order to reduce overall current drain The pullup resistor is automatically reconnected when STBY is driven High after Idle mode has been re established GND Ground ground reference This pin must be connected to system ground VCC Power Supply Voltage 5 V 10 RC Systems now youre talking FUNCTIONAL DESCRIPTION The V8600A is a complete self contained text to speech system It can be interfaced to a microcontroller bus like a static RAM or 1 0 port connected directly to a PC s parallel printer port or with ap propriate signal conditi
21. nly Power supply tolerance 5V 10 5V 5 Supply current typ Active 11 mA 48 mA Idle 1 mA 15 mA Sleep 0 8 pA 50 pA Upgrades updates Via PC serial port Must replace EPROM t In V8600 Compatibility Mode the default the V8600A uses the V8600 V8601 speed range and status responses Program the RC8650 s POR 7 bit to 1 to disable compatibility mode 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 copyrights 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
22. one Synthesizer This circuit shows how a complete stand alone synthesizer can be constructed using only the V8600A and two inexpensive support 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 regu lated 5 V supply and system reset signal The synthesizer can be connected to virtually any source via the serial or parallel ports pro vided Because the TPS7350Q has very low quiescent current and VsS600A voice synthesizer dropout voltage 35 mV at 100 mA and constantly monitors the output voltage this circuit is ideal for battery powered applications The 68 Q resistor at the headphone jack provides balance between 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 PARALLEL PRINTER PORT D5 MAX202 REMOTE VOLUME CONTROL OPTIONAL 3 2 13 12 i TXD 1K O 28 RXD 3 7 10 ill SERIAL 5 7 8 9 i a RS292C PORT GND OF 8 5 14 tt cTs F PHONES STRAIGHT THRU CABLE 6 6 AUF DSR C4 AUF v d F _ 7 4 Ct RTS OF 15 3 gy GND a 1pF 4 2 5V DENOTE C24 Ve CONNECTIONS FOR DB25 CONNECTOR 5 o2 o vec s 1pF TANT OUT OUT
23. oning 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 Functional Block Diagram for the following description Data Register This is an 8 bit register into which ASCII text com mands tone generator and PCM data are written from the parallel Data Bus Dg D7 A host microcontroller can write data to this regis ter 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 8 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 in a stand alone synthesizer The Serial Port operates with 8 data bits 1 or more stop bits no parity and any standard baud rate between 300 and 115200 FUNCTIONAL BLOCK DIAGRAM Vs600A voice synthesizer bps The V8600A determines which baud rate to use by measuring the duration of the shortest High or Low period of the first charac ter received on the RXD pin
24. 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 now you re talking 1609 England Avenue Everett WA 98203 Phone 425 355 3800 www csys com
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