AP8821 APLUS [Aplus Intergrated Circuits], AP8821 Datasheet - Page 2

• Manufacturer Part Number: AP8821
• Description: 21 sec VOICE OTP
• Manufacturer: APLUS [Aplus Intergrated Circuits]

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.
A pair of PWM output pins, V
A current output pin, C
No complex filtering or amplifier circuit is needed. An automatic ramp-down function eliminates
undesired noise at the end of playback.
General Description
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
OUT
, enables the device to drive a speaker through a low cost NPN transistor.
21 sec VOICE OTP
OUT1
Integrated Circuits Inc.
and V
OUT2
provides direct drive to buzzer or speaker.
2
Auto-power down
2.4V – 4.8V single power supply
operation
Low standby current (<5uA at 3V)
Development Tools Support
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
C
V
speaker directly
OUT
OUT1
pin drives speaker with a transistor
and V
OUT2
aP8821
drives buzzer or