AP8821 Datasheet, PDF (2/13 Pages) Aplus Intergrated Circuits – 21 sec VOICE OTP

Integrated Circuits Inc. aP8821
21 sec VOICE OTP
„Features
z 21 Sec Voice Length at 6 KHz
z Combination of voice building blocks
extends the duration of playback
z Voice data re-use saves memory space
z Maximum 14 voice groups
z 4 trigger pins, S1 to S4 for the 4 voice
groups ( group1 ~ 4 )
z SBT for sequential playblack for the rest
of voice groups & CPU mode trigger
z CPU trigger mode for all 14 voice
groups
z Holdable, Unholdable, Edge, Level
triggering option
z Debounce time : 21ms ( Key mode ) /
85us (CPU mode ) - 6K sampling rate
z IRP interrupt pin for master reset
z 3 programmable Outputs for STP stop
pulse, BUSY and LED
z Built-in oscillator with a single external
resistor to determine the sampling rate
z Built-in D/A converter, EPROM
z ADPCM data compression provides
high sound quality
z Optional POP noise elimination function
z C_OUT pin drives speaker with a transistor
z V_OUT1 and V_OUT2 drives buzzer or
speaker directly
zAuto-power down
z2.4V – 4.8V single power supply
operation
zLow standby current (<5uA at 3V)
zDevelopment 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.
A pair of PWM output pins, V_OUT1 and V_OUT2 provides direct drive to buzzer or speaker.
A current output pin, C_OUT, 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.
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