Integrated Circuits Inc.

aP8821

2

21 sec VOICE OTP

Features

21 Sec Voice Length at 6 KHz

Combination of voice building blocks

extends the duration of playback

Voice data re-use saves memory space

Maximum 14 voice groups

4 trigger pins, S1 to S4 for the 4 voice

groups ( group1 ~ 4 )

SBT for sequential playblack for the rest

of voice groups & CPU mode trigger

CPU trigger mode for all 14 voice

groups

Holdable, Unholdable, Edge, Level

triggering option

Debounce time : 21ms ( Key mode ) /

85us (CPU mode ) - 6K sampling rate

IRP interrupt pin for master reset

3 programmable Outputs for STP stop

pulse, BUSY and LED

Built-in oscillator with a single external

resistor to determine the sampling rate

Built-in D/A converter, EPROM

ADPCM data compression provides

high sound quality

Optional POP noise elimination function

speaker directly

Auto-power down

2.4V – 4.8V single power supply

operation

Low standby current (<5uA at 3V)

Development Tools Support

General Description

aP8821 is a high quality voice synthesizer capable of varying playback duration. A proprietary

ADPCM algorithm is used. The audio message is stored in a 512K bits on-chip EPROM which can

store up to 21 seconds of voice data at 6 KHz sample rate.

The

aP8821 eliminates the need of complicated circuitry in voice playback but still achieves high

voice quality for different kind of sounds. Combinations in sections achieve longer playback duration.

No complex filtering or amplifier circuit is needed. An automatic ramp-down function eliminates

undesired noise at the end of playback.