IS22C040
IS22C040
32 to 40 SEC INSTANT VOICE ROM
GENERAL DESCRIPTION
ISSI
OCTOBER 1998
ISSI
®
®
FEATURES
• Voice length at
– 8 KHz sampling is 32 seconds
– 6 KHz sampling is 40 seconds
• Silence compression to save memory
• Eight trigger pins, S1 to S8 for 32 sections
• SBT pin play-all or sequential play-all
• 15 ms debounce time suitable for CDS
• IRP interrupt pin stops playback at once
• STP stop pulse generated at end of playback
• BUSY signal for CPU control
• Two LEDs flash at 3 Hz interval
• 3.0V to 6V single power supply operation
• Low standby current (<5
µA
at 3V)
• Auto-power down
• Built-in oscillator, D/A converter, EPROM
• ADPCM data compression
• Optional pop noise elimination function
• C
OUT
pin drives speaker with a transistor
• Development tools support
• V
OUT
1 and V
OUT
2 drives buzzer directly
• Sampling rate determined by external resistor
• Holdable and unholdable triggering option
• Industrial temperature available
IS22C040 is a high-quality voice synthesizer with a capacity
of 32 to 40 seconds. A proprietary ADPCM algorithm is
used. The audio message is stored in a 1024-Kbit on-chip
EPROM.
The IS22C040 eliminates the need of complicated circuitry
in voice playback (Figure 1) but still achieves high voice
quality. Sounds such as human speech, animal sounds,
musical sounds, and even special sound effects can be
synthesized. Devices can be cascaded to achieve longer
voice duration (Figure 3). Two devices can be configured
in parallel (Figure 4) in order to achieve signal mixing
without an external mixer allowing speeches to be mixed
with background music synthesis from two different chips.
The instant programming nature of the IS22C040 allows a
very short production turnaround time. There are no NRE
charges that are usually required with conventional voice
ROMs. Users now can apply a voice synthesis function as
an additional feature to their products even when production
volume is relatively small. It is also ideal for trial or
engineering prototyping. As a result, the initial investment
is minimal and the risk in the product development phase
is reduced.
The IS22C040 provides a wide voltage operating range
from 3.0V to 6.0V. A pair of PWM output pins, V
OUT
1 and
V
OUT
2 provide direct drive to a buzzer (Figure 2). Voice
quality from a buzzer is comparable to speaker output and
power consumption is much lower.
A current output pin, C
OUT
, enables the device to drive a
speaker with a low cost NPN transistor. No complex
filtering or amplifier circuit is needed. An automatic ramp
up/down function eliminates the undesired noise at the
end of playback.
Up to 32 sections are accessible through S1 to S8. The
SBT trigger pin can be programmed to playback all 32
sections or sequentially from section 1 to 32. An interrupt
pin (IRP) and stop pulse (STP) or BUSY signals provide
handshaking with microprocessors or other IS22C040
devices. All trigger pins give 15 ms debounce time and is
ideal for CDS applications as in Figure 6. Two LED drivers
are available, flashing on and off at approximately 3Hz
intervals (Figure 5). The internal voltage compensation
oscillator requires only one external resistor. Different
sampling frequencies are determined by the external
oscillator resistor value.
ISSI reserves the right to make changes to its products at any time without notice in order to improve design and supply the best possible product. We assume no responsibility for any errors which
may appear in this publication. © Copyright 1998, Integrated Silicon Solution, Inc.
Integrated Silicon Solution, Inc.
VP009-1C
10/01/98
1
IS22C040
BLOCK DIAGRAM
ISSI
®
OSC
OSCILLATOR
ADDRESS
SEQUENCER
CLOCK
GENERATOR
ADPCM
DECODER
CONTROL
LOGIC
POP NOISE
REDUCTION
LED
DRIVER
BUZZER
BUFFER
VOICE
EPROM
Vcc
GND
S1
S8
SBT
IRP
LED2
LED1
STP
D/A
C
OUT
V
OUT1
V
OUT2
Programmable Options
The IS22C040 provides different control functions for user
specified applications. They include:
• Non-sequential or Sequential Play-all
• Unholdable or Holdable trigger
• STOP or BUSY signal selection
• Automatic ramp-up/ramp-down or no ramp-up/ramp-down
Silence Compression
If a particular sound sequence includes periods of silence,
the IS22C040 will automatically compress the silence to
save memory space. This compression will not affect
playback of the sound sequence.
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
V
TERM
T
BIAS
T
STG
Parameter
Terminal Voltage with Respect to GND
Temperature Under Bias
Storage Temperature
Value
–0.5 to +7.0
–40 to +85
–55 to +125
Unit
V
°C
°C
Notes:
1. Stress greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the
device. This is a stress rating only and functional operation of the device at these or any other conditions above
those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect reliability.
OPERATING RANGE
Range
Ambient Temp.
0°C to +70°C
–40°C to +85°C
Vcc
3.0V to 6.0V
3.0V to 6.0V
Commercial
Industrial
2
Integrated Silicon Solution, Inc.
VP009-1C
10/01/98
IS22C040
PIN DESCRIPTIONS
Name
S8
I/O
I
O
O
O
—
O
O
O
I
I
I
—
I
I
—
I
I
I
I
I
Function
Trigger Switch 8, Internal Pull LOW,
Active HIGH
Drives First LED Flash at 3 Hz,
Active LOW
PWM Audio Signal Output for
Buzzer
Compliment PWM Audio Signal
Output for Buzzer
Power Ground
Generate 30 ms Pulse or Busy
Signal After Voice Playback
Drives Second LED Flash at 3 Hz,
Active LOW
Current Output from Internal DAC
for Speaker Playback
Oscillator Resistor Pin to Control
Sampling Frequency
Trigger Switch 5, Internal Pull LOW,
Active HIGH
Trigger Switch 6, Internal Pull LOW,
Active HIGH
Program Power Supply, No
Connect When Voice Playback
Trigger Switch 1, Internal Pull LOW,
Active HIGH
Trigger Switch 2, Internal Pull LOW,
Active HIGH
Positive Power Supply
Trigger Switch 3, Internal Pull LOW,
Active HIGH
Trigger Switch 4, Internal Pull LOW,
Active HIGH
One Key or Sequential Trigger,
Internal Pull LOW, Active HIGH
Interrupt to Stop Playback, Internal
Pull LOW, Active HIGH
Trigger Switch 7, Internal Pull LOW,
Active HIGH
ISSI
PIN CONFIGURATION
20-Pin 300-mil PDIP
®
LED1
V
OUT1
V
OUT2
GND
STP/BUSY
S8
LED1
V
OUT1
V
OUT2
GND
STP
LED2
C
OUT
OSC
S5
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
S7
IRP
SBT
S4
S3
V
CC
S2
S1
V
PP
S6
LED2
C
OUT
OSC
S5
S6
V
PP
S1
S2
V
CC
S3
S4
SBT
IRP
S7
Note:
1. The following pins are used to program data into the memory on the chip:
pins 5, 6, 7, 9, 12, 15, 18 and 19.
4
Integrated Silicon Solution, Inc.
VP009-1C
10/01/98
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