MSM9831 View Datasheet(PDF) - Oki Electric Industry

Part Name

Description

Manufacturer

MSM9831

VOICE SYNTHESIS LSI with on-chip 384Kbit MASK ROM

Oki Electric Industry 

¡ Semiconductor

MSM9831-xxx

PIN DESCRIPTIONS

Pin

Symbol I/O

1

ST

I Playback starter pin.

Description

Phrase Address (number) is determined by the number of times of input to

PI pin while ST being held "L". Playback starts on ST's rising edge with

phrase address data loaded into the LSI. When no pulse input to PImade

while ST being held "L", the LSI recognizes it as "Stop Code" to stop

playback.

2

PI

I Address input pin.

The phrase number to playback is determined by the times of pulse pulse

input to PI pin while ST being held "L".

32-time pulse input has the internal counter initialized.

3

GND

— GND pin.

4

AOUT

O Analog output pin.

Built with N-MOS open-drain type, wave-form output is made in the form of

changing output current. While PDWN being held "H", AOUT maintains 1/2

level output, thus the current keeps on flowing.

The Pop-Noise Canceller is put into works when standby is reset to return to

be active, and when entering into standby mode.

5

VDD

— Power supply pin. Insert a 0.1mF or larger by-pass capacitor in-between GND

pin and this pin.

6

XT

I Wired to the ceramic oscillator when a ceramic oscillator is in use.

Input the clock signal to this pin when the external clock is selected as the

timing source.

Using a ceramic oscillator or an external clock can be selected with OKI's

Analizing and Editing Tool.

7

XT

O Wired to the ceramic oscillator when a ceramic oscillator is in use.

When the external clock is in use, keep this pin open.

8

PDWN

I The LSI remains in standby mode while this pin is being held "L".

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