V8600A Hardware Manual
RC SYSTEMS
V8600A VOICE SYNTHESIZER
V8600A
CMOS, 5 Volt-only
Voice Synthesizer Module
FEATURES
APPLICATIONS
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Robotics
Talking OCR systems
Talking e-mail/telecommunications
Remote diagnostic reporting
Industrial controllers
Electronic test and measurement
Security and warning systems
Aids for the orally or visually disabled
High speech quality, unlimited vocabulary
Converts any ASCII text into speech automatically
Add/modify messages by simply editing a text file
Requires only a single +5 V supply and speaker
User programmable greeting and default settings
Flexible exception dictionary support
2 KB input buffer
Software control of all voice parameters
Real-time and pre-recorded playback of sound files
GENERAL DESCRIPTION
Three-voice musical tone generator
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.
Only a 5 V power supply and speaker are needed for operation.
Dual sinusoidal generator
DTMF (Touch-Tone) dialer
CMOS design – TTL compatible inputs and outputs
Low power:
The V8600A is designed to be piggy-backed onto a host PCB,
such as a system’s controller board, via two 12-pin headers. An
eight bit bidirectional data bus and read/write control pins enable
the V8600A to be easily interfaced to virtually any microprocessor
bus. Stand-alone applications are also possible with the V8600A’s
built in printer and serial ports.
– 110 mW typ active
– 5 mW typ idle
– 250 µW typ standby
• Three built-in interfaces:
– Microprocessor bus
For additional information about using and programming the
V8600A, please refer to the DoubleTalk RC8650 Chipset User’s
Manual, available from http://www.rcsys.com.
– Asynchronous serial port
– Parallel printer port
LOGIC SYMBOL
8
µP
INTERFACE
PARALLEL
PORT
PIN CONFIGURATION
D0-D7
RD#
WR#
SYNC
CONTROL
OUTPUT
VCC
D0
D1
D2
D3
D4
D5
D6
D7
RES#
RD#
WR#
ACK#
BUSY
SP+
SERIAL
PORT
TXD
RXD
SP–
ANALOG
OUTPUTS
LINE
CTS#
SEN
VCC
GND
RES# STBY#
1
2
3
4
5
6
7
8
9
10
11
12
COMPONENT
SIDE
24
23
22
21
20
19
18
17
16
15
14
13
GND
STBY#
SYNC
CTS#
SEN
RXD
TXD
BUSY
ACK#
SP–
SP+
LINE
+5V
V8600A Hardware Manual Rev B1
Revised 2/21/02
1
© 1999-2001 RC Systems, Incorporated
RC SYSTEMS
V8600A VOICE SYNTHESIZER
PIN DEFINITIONS
VCC Power Supply Voltage (+5 V ±10%).
TXD Transmit Data (output, active High). This pin transfers serial
data to the host, least significant bit (LSB) first.
D0-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→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.
RXD Receive Data (input, active High). 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 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.
RES# Reset (input, active Low). A Low on this pin forces a hardware reset: speech production 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.
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, acknowledging 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.
As shown in the Block Diagram, the V8600A contains an internal
power-on reset (POR) circuit, allowing the Reset pin to be left unconnected in most applications. Because the POR circuit drives
the Reset pin through a 47K resistor, it will not contend with external circuitry connected to the Reset pin. Caution: If external voltages are present on one or more of the V8600A's pins before VCC
is applied (therefore exceeding the maximum VIH rating), the internal POR circuit may not operate reliably. In this case, RES# must
be driven from an external source.
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 DoubleTalk RC8650 Chipset User’s Manual for further
details.
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.
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.
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.
Driving STBY# Low for 250 ms or longer 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
(50 µA 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 handshake 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.
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 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 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 ACcoupled, 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 highimpedance state when the V8600A is idle or asleep.
If the V8600A is not in Standby mode, driving STBY# Low for less
than 250 ms initializes the V8600A’s internal memory. Any exception 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.
ACK# Acknowledge (output, active Low). This pin produces a 9
µs 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 becomes available. ACK# is inactive when using the serial port.
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 allowed to float. The pullup resistor is automatically reconnected
once Idle mode has been re-established.
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 last write operation, BUSY will remain
High until room becomes available.
GND Ground (ground reference). This pin must be connected to
system ground.
2
RC SYSTEMS
V8600A VOICE SYNTHESIZER
FUNCTIONAL 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.
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.
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.
Controller. The controller is responsible for processing text and
commands from the host and converting input text into speech.
Tone generation and I/O port flow control are also performed by
the controller.
ROM. The ROM contains the internal operating system and textto-speech algorithms. Some of the ROM is re-writable and used
for storing pre-recorded PCM encoded speech, user dictionary
and custom settings.
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 D0-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#.
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.
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 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 bps. The V8600A determines which baud
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 bridgetied-load output configuration.
BLOCK DIAGRAM
RAM
WR#
D0-D7
DATA
REGISTER
DAC
INPUT BUFFER
AUDIO BUFFER
8
VOL
STATUS
REGISTER
RD#
TXD
RXD
CTS#
SEN
ROM
LINE
TTS CONVERTER
PHONEME TABLES
EXCEPTION DICT.
LPF
SERIAL
PORT
SP+
POWER-ON
DETECTION
AMP
SP–
CONTROLLER
47K
POWER
CONDITIONING
RES#
SYNC BUSY ACK# STBY#
3
VCC
GND
RC SYSTEMS
V8600A VOICE SYNTHESIZER
ABSOLUTE MAXIMUM RATINGS†
TEST CIRCUIT
Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +6.5 V
+5V
DC input voltage, VI . . . . . . . . . . . . . . . . . . . –0.3 V to VCC + 0.3 V
Operating temperature, TA . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C
mA
Storage temperature, TS . . . . . . . . . . . . . . . . . . . . –55°C to +125°C
1
VCC
†
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 specifications is
not implied. Exposure to absolute maximum rating conditions for extended periods may
affect device reliability.
10
RES#
SP+
S1
14
8Ω
V8600A
23
SP–
STBY#
15
S2
GND
24
Pressing S1 then S2 for < 0.25 sec causes message to be spoken
DC CHARACTERISTICS
TA = 0°C to +70°C; VCC = +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
VCC + 0.3
V
VHYR
Input hysterisis, RES#
0.2
1.8
V
VOL
Output voltage, Low
D0-D7
All other outputs
0.3
0.5
V
V
IOL = 6 mA
IOL = 2 mA
V
V
IOH = –6 mA
IOH = –2 mA
VOH
IIL
Output voltage, High
D0-D7
All other outputs
VCC – 0.5
VCC – 0.5
Input current, Low
D0-D7
All other inputs
–10
–120
µA
µA
VI = 0 V
VI = 0 V
IIH
Input current, High
10
µA
VI = VCC
IOZ
Output leakage current, D0-D7
±5
µA
VI = 0 to VCC
RL
Output load impedance, SP+, SP–
POUT
Speaker peak output power
500
mW
ICC
Supply current
Active
Idle
Sleep/Standby
55
3
100
mA
mA
µA
Ω
8
22
1
50
4
RL = 8 Ω
All outputs open;
all inputs = VCC
RC SYSTEMS
V8600A VOICE SYNTHESIZER
AC CHARACTERISTICS
TA = 0°C to +70°C; VCC = +5 V ±10%
Symbol
1
2
3
Parameter
Min
Typ
Max
Unit
tDRV
RD# to Data valid delay
25
61
ns
tDRZ
RD# to Data float delay
23
61
ns
tSDW
Data setup to WR# delay
25
ns
tHWD
Data hold from WR# delay
5
ns
tWWR
WR# pulse width
tDWB
WR# to BUSY , CTS# delay
tWAK
ACK# pulse width
tWRS
RESET# pulse width
tDRR
RESET# recovery delay
250
Test Conditions
ns
15
µs
Note 1
µs
9
3
2
µs
After VCC stable [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
D0-D7
OUTPUT
tDRV
INPUT
tDRZ
RD#
tSDW
tHWD
tWWR
WR#
tDWB
[Note 1]
BUSY/
CTS#
ACK#
1
tDWB applies to the BUSY and CTS# pins and RDY status flag.
5
tWAK
RC SYSTEMS
V8600A VOICE SYNTHESIZER
TIMING DIAGRAMS, CONT’D
Reset
tWRS
RES#
tDRR
INTERFACING THE V8600A
The V8600A includes microprocessor bus, printer, and serial interfaces. Detailed schematics illustrating their uses are shown in
the Application Examples.
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, acknowledging receipt of each character.
Microprocessor Bus Interface
In the microprocessor bus configuration, the V8600A is connected 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.
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.
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.
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.
V8600A Status Bits
STBY. This bit is set to 1 when the V8600A is in Standby mode.
D7
D6
D5
D4
D3
D2
D1
D0
0
SYNC
SYNC
RDY
AF
AE
STBY
0
TYPICAL INTERFACES
µP
V8600A
RD#
RD#
STB#
CS#
WR#
D0-D7
V8600A
PRINTER
PORT
WR#
D0-D7
Microprocessor
WR#
D0-D7
D0-D7
ACK#
ACK#
BUSY
BUSY
Printer Port
6
ASYNC
DTE
RS232C LINE
DRVR/RCVR
V8600A
TXD
RXD
RXD
TXD
CTS
CTS#
RS-232 Serial
RC SYSTEMS
V8600A VOICE SYNTHESIZER
The flowchart below illustrates the recommended method of writing data to the V8600A’s microprocessor interface. This method
should be used for writing all types of data, including text, commands, tone generator and real time audio data.
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.
Note from the AC Characteristics that the V8600A can take up to
15 µs (tDWB) 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 0 ensures that it will not
falsely show that the V8600A is ready for another byte the next
time the output routine is called.
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 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.
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 µs, a
software timeout should be enforced to avoid hanging up in the
wait loop. The time RDY stays 0 is relatively short (8 µs min.) and
can be missed if interrupted. The timeout should be at least 15 µs,
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 µs or longer before exiting, without checking for
RDY = 0 at all.
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
MICROPROCESSOR DRIVER FLOWCHART
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.
START
READ STATUS
REGISTER
RDY = 1
?
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, 0Dh, is recommended for locking the V8600A’s
baud rate. The character is not otherwise processed by the
V8600A; it is discarded.
NO
If the measured bit period corresponds with a valid baud rate, the
V8600A transmits the ASCII character “L” on the TXD pin, providing acknowledgment of lock acquisition.
YES
WRITE BYTE
TO V8600A
BAUD RATE DETECTION TIMING
READ STATUS
REGISTER
Start bit
NO
RXD
RDY = 0
?
YES
NO
15 µs
TIMEOUT
?
CTS#
Baud rate validation (≈75 ms)
YES
TXD
WRITE COMPLETE
7
“L”
RC SYSTEMS
V8600A VOICE SYNTHESIZER
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.
PCB SERIAL PORT OPTIONS
1 2 3
JP3
JP2
JP1
Fixed baud rate option
C104
C103
C102
C101
If automatic baud rate detection is not desired, the baud rate may
be set via jumpers JP1, JP2, and JP3 on the V8600A PCB. The
accompanying table lists the jumper connections for all of the
V8600A’s supported baud rates.
C105
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.
C101 through C105 are 0.1 µF 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.
RS-232 transceiver option
The V8600A’s serial port operates at 0/+5 V levels, which is directly compatible with most microcontroller and microprocessor
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 transceiver may be located on the board to
which the V8600A is mounted, or on the V8600A PCB itself.
U101
The V8600A supports four of the more popular RS-232 transceiver
chips. The industry standards MAX202 or MAX232A are the most
economical choices, but neither can be shut down through the
V8600A’s SEN pin. For power-sensitive applications the MAX222
or MAX242 should be used, because they can be shut down via
the SEN pin. All transceiver chips require that C101 through C105
be installed.
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 highquality 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 (0X) can help pick up the slack of the poor low-end
response of the speaker.
8
JP3
JP2
JP1
2-3
2-3
2-3
2-3
1-2
1-2
1-2
1-2
2-3
2-3
1-2
1-2
2-3
2-3
1-2
1-2
2-3
1-2
2-3
1-2
2-3
1-2
2-3
1-2
Baud Rate
300
600
1200
2400
4800
9600
19200
Automatic (default)
RC SYSTEMS
V8600A VOICE SYNTHESIZER
APPLICATION EXAMPLES
Driving Single-Ended Loads
Phone Line Interface
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
VCC/2. The value of C will depend on the impedance of the load—
100 µF minimum for 8 ohm loads.
This is a suggested circuit for applications requiring connection to
a telephone line. The XE0068 is an FCC Part 68 approved telephone 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
DRIVING SINGLE-ENDED LOADS
+5V
+5V
Additional circuitry
omitted for clarity
1
+5V
RJ11C
JACK
3
47K
26
XMIT
TIP
XE0068
DAA
C
SP+
4
14
3.3K
VCC
24
10K
18
14
SP+
.1 µF
RING
3.3K
V8600A
V8600A
SP–
15
47K
NC
D/V
LOAD
13
GND
14
OH
21
22
1 = SEIZE LINE
0 = RELEASE LINE
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
LINE
(13)
VOL
VOLUME
(REMOTE)
10K
(Internal to V8600A)
TO LPF
For best performance, adjust V8600A
volume control maximum clockwise.
9
SYNC
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 implementation, the board is mapped into the system as an IO port. Switch
bank SW1 selects the I/O address the board will use.
ISA BUS SYNTHESIZER
DB0
DB1
DB2
DB3
DB4
DB5
DB6
DB7
RESET
A2
A3
A4
A5
A6
A7
A8
A9
AEN
A9
A8
A7
A6
A4
A3
A2
B2
A29
2
A28
4
A27
8
A25
11
A24
13
15
A23
A22
A11
3
2
15
5
3
14
7
4
13
9
5
12
12
6
11
14
10
IOW#
GND
+5V
NC
REMOTE VOLUME
CONTROL (OPTIONAL)
P2
P3
2-9
P4
U2
1/6 74LS04
P5
1
P6
G#
P=Q#
19
10
2
Q2
4
Q3
Q4
Q6
18
5
I/O PORT ADDRESS
DECODING LOGIC
Q7
B13
B1, B31
B3, B29
10 µF
3
12
6
11
U3
1/2 74LS32
B14
+
10K
RES#
U4
V8600A
1
Q1
16
LINE
BD SEL#
Q0
Q5
D0-D7
13
VOL
2
P7
1
16
SW1
P1
17
1
U1
74ALS520
P0
6
A26
7
IOR#
8
A5
.1 µF
10
WR#
SP+
RD#
SP–
VCC
1
GND
24
14
SPEAKER/
PHONES
15
ZL ≥ 8 Ω
RC SYSTEMS
V8600A VOICE SYNTHESIZER
APPLICATION EXAMPLES, CONT’D
Stand-Alone Synthesizer
current and dropout voltage (35 mV at 100 mA), and constantly
monitors the output voltage, this circuit is ideal for battery-powered applications.
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
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
The 68 ohm 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.
STAND-ALONE SYNTHESIZER
DB-25
2
D0
3
D1
4
D2
5
D3
PARALLEL
PRINTER
PORT
8
6
D4
7
D5
8
D6
9
D7
1
11
10
STB#
BUSY
ACK#
SLCT
ERROR#
PE
GND
13
15
12
18
+5V
4.7K
12
17
2-9
16
WR# BUSY ACK#
U1
MAX202
DB-9
REMOTE VOLUME
CONTROL (OPTIONAL)
D0-D7
LINE
13
VOL
TXD
RXD
SERIAL
RS-232C PORT
USE
STRAIGHTTHRU CABLE
GND
CTS
DSR
3 (2)
13
12
19
2 (3)
7
10
18
5 (7)
8
9
8 (5)
14
11
6 (6)
7 (4)
TXD
U3
V8600A
SP+
CTS#
3
V–
SP–
6
C1+
GND
C1–
15
.1 µF
( ) DENOTE
CONNECTIONS FOR
DB25 CONNECTOR
10K
.1 µF
.1 µF
1
RTS
21
RXD
4
5
C2+
C2–
V+
VCC
VCC
RES#
1
10
1
14
PHONES
15
GND
24
+5V
2
10 µF
TANT
.1 µF
+
5
OUT
6
8
7
OUT SENSE RES#
16
3
+5V
4
5.2-10 VDC, 100 mA
.1 µF
11
IN
U2
TPS7350Q
(T.I.)
IN
GND
EN#
1
2
REGULATOR/SUPERVISORY CIRCUIT
68
8Ω
RC SYSTEMS
V8600A VOICE SYNTHESIZER
MECHANICAL DATA
All connections to the V8600A are made through two standard 12pin 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.
The V8600A may be secured to the host board with self-locking
nylon standoffs or threaded spacers at the four corner mounting
hole locations.
MODULE DIMENSIONS
4.250
3.850
3.700
0.650
24
0.100
2.700
1
2.300
COMPONENT
SIDE
13
0.450
0.156 DIA (4 PL)
12
0.200 TYP
0.275
ALL DIMENSIONS
IN INCHES
0.200 TYP
SOCKET STRIP = SAMTEC
SSQ-112-01-G-S OR EQUIV.
0.080 - 0.250
INSERTION DEPTH
COMPONENT
AREA
0.062
0.080 MAX
12
0.340
RC SYSTEMS
V8600A VOICE SYNTHESIZER
COMPARISON OF THE V8600A AND V8600/V8601
Item
V8600A
I/O pins
Memory
V8600/V8601
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)
2.0K
V8600: 2.7K
V8601: 26K
16K non-volatile (Note: internal format
of dictionary has changed; V8600
dictionaries must be recompiled)
V8600: 2.7K volatile (shared with
input buffer)
Input buffer
Exception
dictionary
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
Up to 130 seconds
None
Baud rate selection
Automatic, programmable or
jumper-selectable
Automatic only
RS-232 transceiver
External or on-board
External only
Performance†
Significantly more responsive; entire
voice speed range increased
Status obtainable via
serial port†
Speech start = “s”
Speech stop = “t”
Buffer almost empty (<100 bytes) = “e”
Buffer almost full (>1900 bytes) = “f”
Baud rate lock confirmation = “l”
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
Sleep timer or STBY# pin
Sleep timer only
RES# or STBY# pins
RES# pin only
Power supply tolerance
5 V ±10%
5 V ±5%
Supply current (typ)
22 mA
48 mA
Idle
1 mA
15 mA
Sleep
50 µA
50 µA
Via PC serial port
Must replace EPROM
Recorded
sound
Enter
Exit
Upgrades/updates
Active
† In V8600 Compatibility Mode (the default), the V8600A uses the V8600 speed range and status responses.
13
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 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
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