Integrated Circuits Inc.

aP8821

6

Pin Description

Pin No.

Name

I/O/P

Function

1

OUT3

O

Programmable output 3

2

O

PWM audio signal output 1 for buzzer & speaker

3

O

PWM audio signal output 2 for buzzer & speaker

4

P

Power ground

5

OUT1

O

Programmable output 1

6

OUT2

O

Programmable output 2

7

O

Current output from internal DAC for speaker playback

8

OSC

I

Oscillator resistor pin to control sampling frequency

9

VPP

P

Program power,

must connect to VDD when playback

10

S1

I

Trigger switch 1 / CPU Addr.1( LSB ),

internal pull low, active high

11

S2

I

Trigger switch 2 / CPU Addr.2,

internal pull low, active high

12

P

Positive power supply

13

S3

I

Trigger switch 3 / CPU Addr.3,

internal pull low, active high

14

S4

I

Trigger switch 4 / CPU Addr.4 ( MSB ),

internal pull low, active high

15

SBT

I

Key Sequential/CPU trigger, internal pull low, active

high

16

IRP

I

Interrupt to stop playback, internal pull low, active high

Note: The following pins are used to program data into the memory:

pin 4, 5, 6, 8, 9, 12,15 and16.