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參數資料
| 型號： | 22C040 |
| 廠商： | Integrated Silicon Solution, Inc. |
| 英文描述： | HEMOCLAMP/HEMOSTAT (CURVED) |
| 中文描述： | 32至40秒即時語音光盤 |
| 文件頁數： | 1/11頁 |
| 文件大小： | 58K |
| 代理商： | 22C040 |
IS22C040
IS22C040
32 to 40 SEC INSTANT VOICE ROM
Integrated Silicon Solution, Inc.
VP009-1C
10/01/98
1
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.
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
μ
A 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
GENERAL DESCRIPTION
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.
OCTOBER 1998
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