¡ Semiconductor

4

MSM6585

PIN DESCRIPTION

Symbol Type

Description

S1

I

Pins to determine the sampling frequency.

The sampling frequencies of 32k, 16k, 8k, and 4kHz can be selected by

combinations. (See the sampling frequencies in FUNCTIONAL

DESCRIPTION on the selection of combinations.)

T3

I

Pin to test the internal circuit. Set this pin to a high level or make it open

because it has a built-in pull-up resistor.

D0-D3

I

Input pins for ADPCM data.

T4

O

Pin to test the internal circuit. Make this pin open.

GND

—

Ground pin

AOUT

O

Pin to output the analog voice from the low-pass filter. Connect a 0.01 mF

capacitor to this pin. (See the AOUT connecting circuit in FUNCTIONAL

DESCRIPTION on the connecting circuit.)

DAO

O

Pin to output the analog voice from the DA converter.

T1

I

Pins to test the internal circuit. Set these pins to a low level or make them

open because pull-down resistors are included.

VCK

O

This pin outputs the sampling frequency selected by the combinations of

S1 and S2.

The voice synthesis starts or stops by synchronizing with VCK.

RESET

I

Reset pin. The voice synthesis circuit is initialized by synchronizing with

VCK. If this pin is set to a high level, the D0 to D3 data inputs are disabled

become the state of no voice.

XT

I

Pin to connect an oscillator. When the external clock is used, input it

from this pin.

XT

O

Pin to connect an oscillator.

When the external clock is used, make this pin open.

—

Power supply pin. Insert a bypass capacitor of 0.1 mF or more between

this pin and the GND pin.

DIP SOP SSOP

111

S2

222

336

4-7

5, 7,

8, 10

7-10

811

14

912

15

10

13

16

11

14

17

12

16

21

T2

13

17

22

14

18

23

15

20

24

16

22

25

17

23

29

18

24

30

Pin

Pin to test the internal circuit. Make this pin open.