V-Stamp User`s Manual
Contents
1. VOICE SYNTHESIZER V Stamp CMOS 3 3 Volt 5 Volt Voice Synthesizer Module FEATURES e Based on RC Systems RC8660 chipset e Integrated text to speech processor High voice quality unlimited vocabulary Converts any ASCII text into speech automatically Add modify messages by simply editing a text file On the fly control of speed pitch volume etc e Four channel 8 bit A D converter e Record download upload and play sound files Record and or download to onboard recording memory Internal file system for easy management of recordings Data logging mode Recording times from 130 sec to 15 min available e Tone generation Three voice musical Dual sinusoidal DTMF Touch Tone dialer Flexible user exception dictionary Change the pronunciation of any input string based on spelling and context Convert encrypted data into meaningful messages Trigger tone generation message playback voice changes e 8 input buffer for print and forget operation 1 W audio output power can directly drive an 8 ohm speaker e Standard asynchronous serial interface e Low power typ 3 3 V excluding audio power amplifier 6mA active 600 pA idle 100 nA standby GENERAL DESCRIPTION The V Stamp is a feature rich self contained voice sound synthesizer and recorder measuring only 1 7 square inches 10 9 cm in size Among the V Stamp s many features are text to speech conversion audio recor2. The greeting message and user dictionary are erased and all voice parameters and register settings are restored to their factory default settings The audio recording memory is not affected The V Stamp then announces its version number via the LINE and SP pins Connect this pin to a High level if not used RES INPUT RESET A Low immediately terminates all activity and sets all pins to a predetermined state During power up RES must be held Low a minimum of 1 ms after has stabilized in the proper voltage range All pins will be valid within 2 ms after reset Table 1 Pin Descriptions VOICE SYNTHESIZER Pin Name Name Type Name and Function DIGITAL POWER 5 V 0 5 V or 43 3 V 0 3 V digital subsystem power supply connection AUDIO POWER Power supply connection for the audio subsystem Connect this pin to a supply voltage unconnected between 3 0 V and 5 5 V 5 V recommended in order to achieve maximum power output If the audio subsystem is not used output is taken from the LINE pin instead of the SP pins this pin may be left Vss GROUND Connect to system ground Table 1 Pin Descriptions Continued FUNCTIONAL DESCRIPTION The V Stamp includes a number of features that make it ideally suited for any design requiring voice output The V Stamp s major features are described below For detailed information about using and program m
3. 2 V Vos SP Output Offset Voltage 5 50 5 50 mV Po SP Output Power THD lt 1 0 3 1 W 80 IpA Supply Current Po 1W 330 mA 80 0 3 240 mA 80 Po20W 3 8 8 4 9 10 mA RL 2o Shutdown 0 01 2 0 01 2 MUTE Vss may be left unconnected if output is taken from LINE pin instead of SP pins It is permissible for Vpa to be at a different voltage level than Vcc V STAMP VOICE SYNTHESIZER AC CHARACTERISTICS TA 0 C to 70 C Vec 3 3 V 5 V Veg 0V Standby Timing 3 3 0 3 5 0 5 Symbol Parameter Unit Min tWsBL STBY Pulse Width Low To enter Standby mode 250 250 ms To reinitialize parameter memory 8 250 8 250 ms To exit Standby mode Sleep Timer invoked 380 250 ns 7 STBY Figure 4 Standby Waveform Reset Timing Symbol Parameter Unit o Ns twrs RES Pulse Width Low After power on Vcc stable 1 ms Hold RES Low during power up During operation 3 ps tDRR RES Recovery Delay 2 ms NOT UM RES Figure 5 Reset Waveform VOICE SYNTHESIZER MECHANICAL DATA lt 1 200 gt ALL DIMENSIONS EN IN INCHES ii 24 a lo o 10 10 0 100 iQ 101 1 250 101 TOP 10 COMPATIBLE MATING CONNECTORS OUPIIN 2044 1X12
4. four octave range Simple tones to attention getting sounds can be easily created Touch Tone Generator The V Stamp includes an integrated DTMF Touch Tone generator This is useful in telephony applications where standard DTMF tones are used to signal a remote receiver modem or access the public switched telephone network Sinusoidal Tone Generator A precision dual sinusoidal tone generator can synthesize the tones often used in signaling applications The tone frequencies can be independently set allowing signals such as call progress tones to be generated Analog to Digital Converter The four channel 8 bit A D converter can be used to monitor battery cell voltages temperature and other analog quantities The ADC can be programmed on the fly to convert any single channel or scan up to four channels repetitively Data logging and audio recording to the V Stamp s recording memory are also possible through the ADC Audio Subsystem The V Stamp includes an audio subsystem comprised of a low pass filter and audio power amplifier This subsystem operates independently of the V Stamp s digital subsystem a separate power Vpa pow ers the audio circuits and can be connected to a supply voltage that is different than Vcc For example can be connected to 3 3 V to minimize digital power drain and connected to 5 V in order to achieve maximum power output External audio sources can also be filtered and amplifie
5. GS STD PROFILE MOLEX 90147 1212 STD PROFILE MOLEX 44812 0030 LOW PROFILE COMPONENT 0100 iis Pini RN P i 0 236 rI NE 0 025 SQ 0 1 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 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
6. OOOOOOOO0O000 VSS SUSP STBY CTS RXD TXD BRSO BRS1 BRS2 BRS3 VCC VPA 3 3V 45V C2 0 1UF R1 47K 13 14 15 1617 m ae VPA VCC BRS3 BRSO ci RES ANALOG TS INPUTS TO HOST MICRO FUNCTIONAL BLOCK DIAGRAM AMPIN AMPOUT ANO AN3 CTS BRSO BRS3 TS SUSP STBY RES VCC TSO SUSPO STBY RES RC8660 CHIPSET 10K NOM INTERNAL ne TO RC8660 LINE VPA MUTE SUBSYSTEM VOICE SYNTHESIZER PIN DESCRIPTIONS Pin Name Type Name and Function LINE INPUT LINE High impedance unfiltered audio output also feeds into onboard audio subsystem Output voltage range is OUTPUT from 0 V to Vcc External audio sources may also be resistively summed with the V Stamp s audio and amplified through this pin SP OUTPUT SPEAKER Low impedance filtered differential audio output that can deliver up to 1 W into an 8 ohm load SP Output power is a function of the voltage on the pin and Volume command setting A DC voltage of VpA 2 is present on each pin when MUTE is High both pins go into a high impedance state when MUTE is Low Do not connect either pin to a low impedance ground referenced load without a DC blocking capacitor TS OUTPUT TALK STATUS Indicates when the V Stamp is active TS can be used to enab
7. aintained at lower settings in order to avoid distortion in the power amplifier which can dramatically increase power dissipation and power consumption The speaker output pins are designed to drive a load differentially The benefits of this design compared with a single ended ground ref erenced design are many the most significant being up to four times greater power output for a given supply voltage reduced amplifier pow er dissipation higher efficiency better rejection of power supply noise and the elimination of a large DC blocking capacitor on the output Do not attempt to connect a ground referenced load to either SP pin directly Each pin has a DC bias component of VpA 2 V which would result in a high DC current flowing through the load possibly damaging the load and or power amplifier Instead connect the load through a DC blocking capacitor A minimum value of 100 pF is recommended for 8 ohm loads External audio sources may also be filtered and amplified through the V Stamp s audio subsystem by injecting them into the LINE pin via a series resistor The total of the resistor and external signal s source impedance should be at least several in order to avoid loading the V Stamp s signal excessively and the signal amplitude must be limited to between 0 V and Vcc Power supply consumption can be minimized when the V Stamp is not in use by shutting down the audio subsystem with the MUTE pin can be connecte
8. chronous serial data output used to read information out of the V Stamp CTS OUTPUT CLEAR TO SEND The CTS pin is Low when the V Stamp is able to accept data If the input buffer becomes full as a result of the last byte received will go High and remain High until room becomes available BRS0 INPUT BAUD RATE SELECT Programs the V Stamp s serial port baud rate Both the RXD and TXD pins are pro BRS3 grammed to the rate set by these pins Connecting BRS0 BRS3 to a High level allows the V Stamp to automati cally detect the incoming baud rate STBY INPUT STANDBY INIT Dual function pin which either puts the V Stamp in Standby mode or initializes the V Stamp s internal parameter memory STBY must be High on the rising edge of RES Driving STBY Low for 250 ms or longer causes the V Stamp to enter Standby mode The CTS pin is driven High not ready state and the input buffer is cleared During standby the V Stamp draws the minimum possible current 100 nA typ 3 3 V but it is not able to respond to any input pin except STBY and RES Returning STBY High causes the V Stamp to enter Idle mode 600 pA typ the CTS pin is driven Low and the V Stamp will be able to accept input again If the V Stamp entered standby due to a Sleep Timer event driving STBY Low for 250 ns or longer then High will return the V Stamp to Idle mode Driving STBY Low for less than 250 ms initializes the V Stamp s non volatile parameter memory
9. d through the V Stamp s audio system by injecting them into the LINE pin through a series resistor If the audio subsystem is not required in an application output is taken from the LINE pin instead of the SP pins may be left unconnected to further minimize power consumption The MUTE pin may also be used to effectively shut down the audio subsystem when not in use VOICE SYNTHESIZER INTERFACING THE V STAMP All communication with the V Stamp is performed via the built in asyn chronous serial interface The serial interface operates with 8 data bits LSB first 1 or more stop bits no parity and any standard baud rate between 300 and 115200 bps The V Stamp s serial port operates at 0 5 V or 0 3 3 V logic levels If the host system operates at RS 232C levels such as a PC s serial port the circuit in Figure 1 can be used to provide the correct voltage level conversion The 9 pin should be used to control the flow of data to the V Stamp It is not necessary to check CTS before transmitting every byte however All data is routed through a high speed 16 byte buffer within the V Stamp before being stored in the primary buffer CTS may be checked every eight bytes with no risk of data loss Baud Rate Selection The serial port s baud rate can be programmed using any of three meth ods pin strapping auto detect and by command Pin strapping sets the baud rate according to the logic lev
10. d to a microcontroller s I O port pin for direct control by the application or it can be connected to the V Stamp s TS pin Connection to the TS pin offers the greatest flexibility because the pin can be controlled through the V Stamp s serial port using the RC8660 s TS Pin Control command With the TS pin s default setting the pin will automatically activate the audio subsystem when required and shut it down when it is no longer needed If an external audio source needs to use the audio subsystem it can activate it manually by setting the TS pin High with the 3K command A D Converter The V Stamp s onboard ADC has the following features Four channels 8 bit resolution 2 LSB precision One shot continuous single sweep and continuous sweep modes of operation Support for external amplification signal conditioning of all four ADC channels In most applications analog voltages to be converted by the ADC may be connected directly to the AN input pins The minimum and maxi mum input voltage limits must be observed however in many cases this can be accomplished with a simple resistive divider Because the CMOS AN pin input impedances are extremely high the error introduced by a resistive divider is minimal It is also good design practice to include a small capacitor from the AN pin to ground as a precautionary measure against noise that may be present on the signal being measured Applications using the ADC for voice recordin
11. ding and playback musical and sinusoidal tone generation a telephone dialer and four channel A D converter All features are ac cessed using a standard logic level serial interface The V Stamp mates with two standard 12 pin PC board connectors Separate power pins are provided for the onboard digital and audio subsystems allowing for several possible output power and power con sumption combinations For additional information about using and programming the V Stamp please refer to the DoubleTalk RC8660 Chipset User s Manual avail able from http www rcsys com APPLICATIONS Robotics Electronic test and measurement GPS navigation systems Meeting federal ADA requirements Talking e mail telecommunications Remote diagnostic reporting ATM machines Dial up information systems Vending and ticketing machines Industrial controllers Security and warning systems Aids for the orally or visually disabled V Stamp Product Summary Order Operating Recording Number Voltage Capacity Chipset VS5130 5V 130 sec RC8660 1 VS3130 3 3V 130 sec RC86L60 1 VS3910 33 910 sec RC86L60 3 Based on 8 kHz sam pling rate with ADPCM encoding V Stamp User s Manual Rev 1 1B Revised 8 10 05 2004 2005 RC Systems Incorporated VOICE SYNTHESIZER PIN CONFIGURATION TYPICAL APPLICATION CIRCUIT RES TS AN3 AN2 AN1 ANO AMPOUT AMPIN LINE MUTE SP SP O
12. els present on the BRS0 BRS3 pins as shown in Table 2 Auto detect enables the serial port to auto matically detect the baud rate of the incoming data The baud rate com mand described in the DoubleTalk RC8660 Chipset User s Manual allows the baud rate to be changed at any time effectively overriding the first two methods The automatic baud rate detection mechanism is enabled when the BRSO BRSS3 pins are all at a High logic level The baud rate is de termined by the shortest High or Low period detected in the input stream This period is assumed to be the bit rate of the incoming data therefore it is important that there be at least one isolated 1 or 0 in the input character The CR character ODh is recommended for locking the baud rate The character is not otherwise processed by the V Stamp it is discarded If the measured bit period is determined to be a valid baud rate the V Stamp acknowledges lock acquisition by transmitting the ASCII char acter 6Ch on the TXD pin The baud rate will remain locked unless changed with the baud rate command or the V Stamp 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 75 ms or longer Consequently the V Stamp will ignore any data sent to it for a BES3 BRS1 BRSO Baud Rate per
13. g will require a micro phone and preamplifier The circuit shown in Figure 3 is suitable for this purpose as it offers high gain low cost and low power consump tion less than 200 pA typ at supply voltages of 3 3 V to 5 V including the current of a second internal amplifier not shown In addition the circuit provides low pass filtering to prevent undesired frequencies from reaching the ADC This circuit should work well with most any electret condenser microphone Please refer to the DoubleTalk RC8660 Chipset User s Manual for information on programming and using the ADC as well as how to record to the RC8660 s recording memory R4 1M pu UF 39PF ure E R1 2K a R2 10K C31UF R3 2K 2 V e 1 R5 5 6K 10UF T a TO ADC INPUT PIN S gt 1 LMV358M 5 2 8 2NF MD9745APZ F 4 Figure 3 Microphone Preamp amp Filter Circuit VOICE SYNTHESIZER ELECTRICAL SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS WARNING Stresses greater than those listed under Absolute Supply voltage Vcc and Vp 0 3 V to 46 5 V Maximum Ratings may cause permanent damage to the device 03 3 This is a stress rating only operation of the device at any condition DE bu Voltage Viii patei d iios etd above those indicated
14. in the operational sections of these specific Operating temperature 0 C to 70 C ations is not implied Exposure to absolute maximum rating condi Storage temperature 55 C to 125 C tions for extended periods may affect device reliability DC CHARACTERISTICS TA 0 C to 70 C Vee 3 3 V 5 V 3 3 5 Vss Digital Subsystem Vcc 3 3 0 3 V Vcc 25V 0 5 V Symbol Parameter Unit Test Conditions Min Typ Min Typ Vit Input Voltage Low 0 3 0 2 0 3 0 2 V Vin Input Voltage High 0 7Vec Voc 0 3 0 7 0 31 V ViA Analog Input Voltage ANO 3 0 3 Vec 0 3 Vec V Vuyg Input Hysterisis RES 0 2 1 8 0 2 1 8 V VoL Output Voltage Low 0 5 0 5 V Iop 1mA Output Voltage High 0 5 0 5 V 1 Input Load Current 4 5 uA Vin Vss to Ro LINE Output Resistance 4 10 20 4 10 20 kQ Icc Supply Current Active 6 18 13 33 mA All outputs open Idle 0 6 1 5 1 2 2 5 mA all inputs Voc Standby 0 1 15 0 2 20 Vsg Program Note 1 35 65 mA 1 Applies during internal programming operations greeting message dictionary sound library and microcode updates Audio Subsystem 3 3 0 3 V 5 0 5 Symbol Parameter Unit est Conditions Min Typ Max Min Typ Max VL MUTE Input Voltage Low 0 4 0 4 V Vin Input Voltage High 1 2 1
15. ing the V Stamp refer to the DoubleTalk RC8660 Chipset User s Manual Text to Speech Synthesizer The V Stamp provides text to speech conversion with its integrated DoubleTalk text to speech synthesizer Any English text written to the V Stamp is automatically converted into speech Commands can be embedded in the input stream to dynamically control the voice even at the phoneme level phonemes are the basic sound units of speech A greeting message can be stored in the V Stamp that is automatically spoken immediately after the V Stamp is reset Most any of the com mands recognized by the V Stamp may be included as part of the greeting message which can be used to set up custom default settings and or play a pre recorded message or tone sequence An integrated nonvolatile memory area is also provided for storing a custom pronun ciation dictionary allowing the pronunciation of any character string to be redefined Audio Recording and Playback Up to 15 minutes of recorded messages and sound effects can be stored in the V Stamp for on demand playback Recordings are stored in onboard nonvolatile memory providing zero power message storage Additionally the V Stamp can play eight bit PCM and ADPCM audio in real time such as speech and or sound effects stored in an external memory or file system Musical Tone Generator An integrated three voice musical tone generator is capable of gener ating up to three tones simultaneously over a
16. iod of 75 ms after the lock on character has been received The L L L L 300 CTS pin is driven High during this time and the acknowledgment character is not transmitted until the V Stamp is actually ready to ac L L L H 600 cept data See Figure 2 L L H L 1200 L L H H 2400 L H L L 4800 L H L H 9600 Start bi L H H L 19200 RENNES L H H H Auto detect RXD eO XXXXXXX H L L 38400 p ie a H L L H 57600 mE Baud rate validation 75 ms H E H 115200 o n X All other settings Auto detect po en Table 2 Baud Rate Options Figure 2 Baud Rate Detection Timing vec MAX3232 Ld 1 Ci 1 POR vr 0 1UF 01UF e DSR E BRSO E Sty ca 4 BRS our 1 elis ig S 0 BASS 5 5 c gt 2 4 ni 8 4 20 rus 5 TXD n Til TIO 2 R20 8 CTS p 19 Tal T20 o4 USE STRAIGHT THRU CABLE Figure 1 RS 232C Interface VOICE SYNTHESIZER Audio Subsystem The V Stamp s audio subsystem can directly drive an 8 ohm speaker with up to one watt of output power at 5 V If less power is needed the pin can be connected to a lower voltage such as V which will reduce power consumption Note however that the power amplifier has been optimized for operation at Vp 5 V When operat ing at voltages lower than this it is recommended that the V Stamp s software controlled volume level nV command be m
17. le devices such as a transmitter telephone or audio amplifier The pin s polarity is programmable and can be activated automatically or under program control SUSP INPUT SUSPEND Suspends audio output when Low allowing playback to be paused When High playback resumes at the point output was suspended During recording operations SUSP will suspend recording when Low Con nect this pin to a High level if not used MUTE INPUT MUTE Shuts down the audio subsystem when Low reducing the Vpa pin current to less than 1 pA The SP pins also enter a high impedance state when MUTE is Low Connecting this pin to the TS pin will cause the ampli fier circuit to automatically shut down whenever the V Stamp is inactive thus conserving power INPUT A D CONVERTER INPUTS Analog to digital converter input pins Analog signals sampled on these pins can be read through the serial interface or stored in recording memory Leave any unused pins unconnected AMPIN OUTPUT A D CONVERTER AMPLIFIER Connecting an operational amplifier between these pins allows the input volt age to all four A D converter input pins to be amplified with one operational amplifier Leave these pins uncon AMPOUT INPUT nected if not used RXD INPUT RECEIVE DATA Asynchronous serial data input used to send text data and commands to the V Stamp Uses standard protocol of 8 data bits 1 stop bit no parity TXD OUTPUT TRANSMIT DATA Asyn
18. purposes only and RC Systems makes no warranties or representations that the devices described herein will be suitable for such applications ens youre talking 1609 England Avenue Everett WA 98203 Phone 425 355 3800 Fax 425 355 1098 http www rcsys com
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