®
IS22C022
VERSATILE 20 SEC INSTANT
VOICE ROM
ISSI
SEPTEMBER1999
FEATURES
GENERALDESCRIPTION
• Minimum 20 second voice length at 6 KHz
• Versatile features for playback
IS22C022 is a high quality voice synthesizer capable of
varyingplaybackduration. AproprietaryADPCMalgorithm
is used. The audio message is stored in a 512K bits
on-chip EPROM which can store up to 20 seconds of
voice data at 6 KHz sample rate.
• Combination of voice building blocks
extends the duration of playback
• Voice data re-use saves memory space
• Four trigger pins, S1 to S4 for eight groups
• SBT for sequential play-all or random play
TheIS22C022eliminatestheneedofcomplicatedcircuitry
in voice playback but still achieves high voice quality.
Sounds such as human speech, animal sounds, musical
soundsandevenspecialsoundeffectscanbesynthesized.
Versatilecombinationsinsectionsachievelongerplayback
duration. In addition, devices can be cascaded to achieve
longer voice duration. Two devices can be configured in
parallel in order to achieve signal mixing without an
external mixer in which speech can be mixed with
background music each from one of two different chips.
• Holdable and unholdable, edge and level
triggering option
• 15 ms debounce time suitable for CDS
• IRP interrupt pin for master reset
• Three programmable output pins for STP Stop
Pulse, BUSY Signal, and LED
The IS22C022 provides wide operating voltage range
from 2.4V to 6.0V. PWM digital amplifier output pins,
VOUT1 and VOUT2 provides direct drive to buzzer or
speaker.
• Built-in oscillator with variable sample rate
• Single external resistor to determine sample rate
• Built-in D/A converter, EPROM
A current output pin, COUT, enables the device to drive a
speaker through a low cost NPN transistor. No complex
filtering or amplifier circuit is needed. An automatic
ramp-down function eliminates undesired noise at the end
of playback.
• ADPCM data compression provides high sound
quality
• Optional pop noise elimination function
• COUT pin drives speaker with a transistor
Group of sections
The voice data memory area of the IS22C022 can be
subdivided into 126 sections. Any combination of these
sections will form an individual group for data playback. A
maximum of eight groups are available with activation
controlled by S1 to S4 pins. The SBT pin can be used to
trigger multiple groups playback in sequence.
• VOUT1 and VOUT2 drives buzzer or speaker di-
rectly
• Auto-power down
• 2.4V-6V single power supply operation
• Low standby current (<5 µA at 3V)
• Development tools support
This specification contains ADVANCE INFORMATION data. 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 1999, Integrated Silicon Solution, Inc.
Integrated Silicon Solution, Inc. — 1-800-379-4774
Rev. A
1
11/15/99
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