V-Stamp User`s Manual
Contents
1. now youre talking voice synthesizer PIN CONFIGURATION TYPICAL APPLICATION CIRCUIT 43 3V 45V C2 0 1UF R1 47K RES O vss TS O susP AN3 5 ANO AMPOUT 50 ANALOG AMPIN BRS1 Dog LINE BRs2 MUTE SP O vec sP VPA EF TO HOST J gt MICRO fo 80 SPKR R2 provides balance between relative speaker volume and headphone volume as well as improving headphone S N ratio and providing short circuit protection FUNCTIONAL BLOCK DIAGRAM AMPIN LINE AMPOUT ANO AN3 TXD CTS MUTE BRSO BRS3 BRSO BRS3 TS TS0 SUSP SUSPO STBY STBY RES RESET SP vec vec RC8660 AUDIO CHIPSET SUBSYSTEM RC Systems W Stamp now you re talking voice synthesizer PIN DESCRIPTIONS Pin Name Type Name and Function LINE INPUT LINE High impedance 10 typ unfiltered audio output also feeds into onboard audio subsystem OUTPUT Output voltage range is from 0 V to Vcc External audio sources may also be resistively summed with the V Stamp 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 power2. 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 programming 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 automati cally spoken immediately after the V Stamp is reset Most any of the commands 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 pronunciation dictionary allowing the pronunciation of any character string to be redefined Audio Recording and Playback Up to 33 minutes of recorded messages and sound files can be stored in the V Stamp for on demand playback Recordings are stored in onboard nonvolatile memory providing zero power mes sage st
3. applications analog voltages to be converted by the ADC may be connected directly to the ANO ANS input pins The mini mum and maximum input voltage limits must be observed how ever in many cases this can be accomplished with a simple resistive divider Because the CMOS ADC input pin impedances are extreme ly 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 recording will require a mi crophone and preamplifier The circuit shown in Figure 3 is suitable for this purpose as it offers high gain low cost and low power con sumption less than 330 uA typ at supply voltages of 3 3 V to 5 V 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 Users Manual for information on programming and using the ADC as well as how to record to the RC86605 recording memory VCC R1 2K R2 10K C3 1UF R3 2K R4 1M 0 1UF C4 39PF VUES ci 10UF R6 1M 1 2 M1 MD9745APZ F R5 5 6K e gt ADC INPUT PIN L_ C5 8 2NF Figure 3 Microphone Preamp amp Filter Cir
4. 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 is High both pins enter 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 enable devices such as a transmit ter 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 re sumes at the point output was suspended During recording operations SUSP suspends recording when Low SUSP can also be used to suspend the transfer of a file while a file is being uploaded from recording memory Connect this pin to a High level if not used MUTE INPUT MUTE Shuts down the audio subsystem when Low reducing the Vp pin current to less than 1 yA The SP pins also enter a high impedance state when MUTE is Low Connecting this pin to the TS pin will cause the amplifier circuit to automatically shut down whenever the V Stamp is inactive thus conserving power Connect this pin to a High level if not used ANO AN3 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 rec
5. 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 Stamps 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 MUTE can be connected to a microcontrollers 1 0 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 flex voice synthesizer ibility because the pin can be controlled through the V Stamp s serial port using the RC86605 TS Pin Control nK command With the TS pin s default setting 1K the pin will automatically activate the audio subsystem when required and shut it down when it is no longer needed Applications that require manual control of the audio subsystem can activate and deactivate it with the RC8660 3K and 2K commands respectively 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
6. RC Systems 11 1 WM Stamp now youre talking V Stamp CMOS 3 3 Volt 5 Volt Voice Synthesizer Module FEATURES Based on RC Systems RC8660 chipset ntegrated 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 Four channel 8 bit A D converter Record download upload and play sound files Record and or download to onboard recording memory nternal file system for easy management of recordings Data logging mode Recording times from 2 min to 33 min available Tone generation Three voice musical Dual sinusoidal 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 8 KB input buffer for print and forget TTS operation 1 W audio output power can directly drive an 8 ohm speaker e Standard asynchronous serial UART interface Low power typ 3 3 V excluding audio power amplifier 3 8 mA active 700 pA idle 0 7 uA standby GENERAL DESCRIPTION The V Stamp is a feature rich self contained voice sound synthe sizer and recorder measuring only 1 7 square inches 11 cm in size Among the V S
7. Stamp to enter Idle mode 700 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 STBY is also used to restore the V Stamp to its factory default settings To prevent this from happening unintentionally make sure that STBY is High no later than 0 5 sec after RES goes High See Appendix B Restore Mode in the DoubleTalk RC8660 Users Manual for additional information 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 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 RC Systems 3X MV Stamp now youre talking voice synthesizer Pin Name Type Name and Function unconnected Vcc DIGITAL POWER 5 V 0 5 V or 3 3 V 0 3 V digital subsystem power supply connection VpA AUDIO POWER Power supply connection for the audio subsystem Connect this pin to a supply voltage between 3 0 V and 45 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
8. Timing RC Systems 3 W Stamp now youre talking Audio Subsystem The V Stamp s audio subsystem can directly drive an 8 ohm speaker with up to one watt of output power at VpA 5 V If less power is needed the VpA pin can be connected to a lower voltage such as 3 3 V which will reduce power consumption Note however that the power amplifier has been optimized for operation at VpA 5 V When operating at voltages lower than this it is recommended that the V Stamps software controlled volume level nV command be maintained 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 referenced design are many the most significant being up to four times greater power output for a given supply voltage reduced amplifier power 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 2 V which would result in a high DC current flowing through the load possi bly damaging the load and or power amplifier Instead connect the load through a DC blocking capacitor A minimum value of 100 uF is recommended for 8 ohm
9. Vec 0 5 Vec 0 5 V loo 1 liL Input Load Current 4 5 Vin Vss to Ro LINE Output Resistance 4 10 20 4 10 20 KQ lcc Supply Current Active 3 8 14 7 22 mA All outputs open Standby 0 7 15 0 8 20 or Vas Program Note 1 30 40 mA 1 Applies during internal programming operations greeting message dictionary recording memory and microcode updates Audio Subsystem Vpa 3 3 V nom 2 5 V nom a Symbol Parameter Unit Test Conditions Min Typ Max Min Typ Max VIL MUTE Input Voltage Low 0 4 0 4 V MUTE Input Voltage High 1 2 1 2 V Vos SP Output Offset Voltage 5 50 5 50 mV Po SP Output Power THD 196 0 5 1 1 RL 80Of 1 kHz Supply Current 1 1 330 mA 80 0 5 W 240 mA 80 Po 0W 4 8 5 10 mA 2o Shutdown 0 01 2 0 01 2 MUTE Vss Vpa may be left unconnected if the output is taken from the LINE pin instead of the SP pins It is permissible for Vp to be at a different voltage level than Vcc RC Systems A MV Stamp now you re talking voice synthesizer AC CHARACTERISTICS Ty 0 C t0 70 C Vec 3 3V 5 V Ves 0V Standby Timing Vec 23 3 0 3 V Veg 5V20 5V Symbol Parameter Unit Min Max Min Max STBY pulse width Low To enter Standby mode 5 5 ms To exit Standby mode Sleep Timer invoked Note 1 380 250 ns 1 Monitor the CTS pin to
10. ations 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 youre talking 1609 England Avenue Everett WA 98203 Phone 425 355 3800 WWW ICSys com
11. cuit RC Systems AX WM Stamp now youre talking ELECTRICAL SPECIFICATIONS ABSLUTE MAXIMUM RATINGS Supply voltage Vcc voice synthesizer Storage temperature Ts 55 C to 125 C 33V 0 3V to 4 0 V WARNING Stresses greater than those listed under Absolute 8 0 3 6 5 V Maximum Ratings may cause permanent damage to the device E This is a stress rating only operation of the device at any condition Sup py osten git quie above those indicated the operational sections of these specifica DC input voltage Vp 0 3 V to Vcc 0 3 V tions is not implied Exposure to absolute maximum rating condi Operating temperature 0 C to 70 tions for extended periods may affect device reliability DC CHARACTERISTICS Ta 0 C to 70 C Vec 3 3 V 5 V Vp42 3 3 V 5 V Ves 0 V Digital Subsystem Vec 23 3V 0 3 V Vec 5V 0 5V Symbol Parameter x Unit Test Conditions Min Typ Max Min Typ Max Viu Input Voltage Low 0 3 0 2Vcc 0 3 0 2Vcc V Input Voltage High 0 7Vcc Vcc 0 3 0 7Vec 0 3 V VIA Analog Input Voltage ANO 3 0 3 Vcc 0 3 Vcc V Input Hysterisis RES 0 2 1 8 0 2 1 8 V VoL Output Voltage Low 0 5 0 5 V lop 21 mA Von Output Voltage High
12. determine when Standby mode has terminated gt STBY Figure 4 Standby Waveform Reset Timing Symbol Parameter Min Max Unit Notes rs RES pulse width Low Hold RES Low during power up STBY After power on Vcc stable 1 m must be High no later than 0 5 sec after RES During operation 3 us goes High V Stamp performs internal initialization all outputs tpRR RES recovery delay 2 ms will be floating Do not attempt to send data to the V Stamp during this period twrs RES Figure 5 Reset Waveform RC Systems 5 now you re talking voice synthesizer MECHANICAL DATA ALL DIMENSIONS IN INCHES 1 250 Y COMPATIBLE MATING CONNECTORS OUPIIN 2044 1X12GS STD PROFILE MOLEX 90147 1212 STD PROFILE MOLEX 44812 0030 LOW PROFILE COMPONENT AREA 0 500 im 0 100 Y opum cs 2 i V 0 236 l les 0 025 SQ 0 0 RC Systems 111 1 WM Stamp now you re talking voice synthesizer APPENDIX A Revision History REVISION 01 APRIL 18 2007 Updated DC power specifications Added 33 minute recording time option to product offerings Specifications Changed Icc supply current spec in DC Characteristics Active cur rent has been reduced by approximately 4096 Ordering Information VS3950 added to Product Summary table REVISION 02 JUNE 27 2008 Updated to ref
13. e Options The automatic baud rate detection mechanism is enabled when the BRSO BRS3 pins are all at a High logic level The baud rate is determined 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 is recom mended 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 will acknowledge lock acquisition by transmitting the ASCII character I 6Ch 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 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 period of 75 ms after the lock on character has been received The CTS pin is driven High during this time and the acknowl edgment character is not transmitted until the V Stamp is actually ready to accept data See Figure 2 Start bit RXD ers Baud rate validation 75 ms t 7 6Ch Figure 2 Baud Rate Detection
14. lect new Restore mode Specifications Updated STBY pin description in Table 1 REVISION 03 JANUARY 21 2009 Updated to reflect new method of controlling the dataflow of uploads from recording memory Specifications Updated SUSP pin description in Table 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 applic
15. n Vpa powers the audio circuits and can be connected to a supply voltage that is different than Vcc For example Vcc can be con nected to 3 3 V to minimize digital power drain and VpA connected to 5 V in order to achieve maximum power output External audio sources can also be filtered and amplified 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 RC Systems 3 W Stamp now youre talking INTERFACING THE V STAMP All communication with the V Stamp is performed via the built in asynchronous 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 Most modern microcon trollers have at least one UART that can be used to connect to the V Stamp A typical microcontroller interface circuit is shown in Figure 1 The circuit includes an external programming port which allows the V Stamp to be programmed in circuit Data files and firmware updates can be downloaded from a PC to the V Stamp through this port Note that an external RS 232 transceiver chip will generally be required in order to convert the PC
16. orage 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 gen erating up to three tones simultaneously over a 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 bat tery 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 pi
17. ording 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 AMPOUT INPUT unconnected 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 Asynchronous 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 CTS will go High and remain High until room becomes available BRSO INPUT BAUD RATE SELECT Programs the V Stamps serial port baud rate Both the RXD and TXD pins are pro BRS3 grammed to the rate set by these pins Connecting BRSO BRS3 to a High level allows the V Stamp to auto matically detect the incoming baud rate STBY INPUT STANDBY A Low immediately terminates all activity and places the V Stamp in 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 0 7 uA 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
18. s RS 232 voltage levels to the V Stampss logic levels The CTS 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 C7S may be checked every eight bytes with no risk of data loss V STAMP vec MICRO BRSO 9 BRS1 9 BRS2 9 BRS3 10K CTS amp O O CTS CTS INSTALL FOR OPTIONAL RXD PROGRAMMING PORT TXD 6406 Figure 1 Serial Interface Baud Rate Selection The serial port s baud rate can be programmed using any of three methods pin strapping auto detect and by command Pin strap ping sets the baud rate according to the logic levels present on the 50 53 pins as shown in Table 2 Auto detect enables the serial port to automatically detect the baud rate of the incoming data The baud rate command described in the DoubleTalk RC8660 Chipset Users Manual allows the baud rate to be changed at any time effectively overriding the first two methods voice synthesizer BRS3 BRS2 BRS1 BRSO Baud Rate L L L L 300 L L L H 600 L L H L 1200 L L H H 2400 L H L L 4800 L H L H 9600 L H H L 19200 L H H H Auto detect H L L L 38400 H L L H 57600 H L H L 115200 All other settings Auto detect Table 2 Baud Rat
19. tamp s many features are text to speech con version audio recording and playback musical and sinusoidal tone generation a telephone dialer and four channel A D converter All features are accessed using a standard logic level serial interface The V Stamp mates with two standard 12 pin PC board connec tors Separate power pins are provided for the onboard digital and audio subsystems allowing for several possible output power and power consumption combinations For additional information about using and programming the V Stamp please refer to the DoubleTalk RC8660 Chipset User s Manual available from www rcsys com voice synthesizer COMPLIANT 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 e Industrial controllers e Security and warning systems e Aids for the orally or visually disabled V Stamp Product Summary Order Operating Recording Voltage Capacity VS5130 5V 2 RC8660F1C VS3130 3 3 V 2 min RC86L60F 11 VS3910 3 3 V 15 min RC86L60F3I VS3950 3 3 V 33 min RC86L60FAI Based on 8 kHz sampling rate with ADPCM encoding V Stamp User s Manual Rev 04 Revised 12 15 11 2004 2011 RC Systems Incorporated RC Systems 11 1 WM Stamp
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