SM1350AAQM

SEIKO NPC CORPORATION - 3

PIN DESCRIPTION

No.

Pin Name

I/O

State

*1

Description

1

VDD

-

-

Supply pin

2

S0

3

S1

4

S2

5

S3

I

SU

Binary select mode : Phrase select pins.

Serial select mode : S0 and S1 control melody output.

6

MODE

I

SU

Melody select mode control. Binary mode when LOW, and serial

mode when HIGH.

7

LH

I

SU

Melody output mode control. One-shot when LOW, and level hold

when HIGH.

8

STOP

I

U

One-shot melody mode : Melody output stop control.

Level hold melody mode : invalid input.

9

STN

I

U

Melody start control

10

BUSYN

O

C

Busy output signal. LOW when a melody is output.

11

CT

O

C

External control pulse output

12

ICN

I

U

Initialization clear input

13

VSS

-

-

Ground pin

14

VOL

I

-

Volume adjusts control. Volume adjusted using an external resistor.

15

SPN

O

P

VOL current output

16

SP

O

P

10-bit D/A converter output

17

EBUSYIN

I

U

It is not necessary to use it usually. It should connect VDD or OPEN.

When this terminal is made LOW, BUSYN compulsorily becomes

LOW. A pop sound might be emitted.

18

ENDN

O

C

Pulse signal when melody output ends

19

T1N

I

U

20

T2N

I

U

21

T3N

I

U

Test signal inputs

This terminal cannot be used. It should connect VDD or OPEN.

22

TO

O

C

Test signal output. 62.5kHz output when not in test mode.

23

XTN

O

-

Oscillator output

24

XT

I

-

Oscillator input

*1. U : pull-up resistor connection

SU : pull-up resistor connection only when melody output starts

(Function for current consumption decrease when driving with battery. Only when the terminal is read, the pull-up

resistor is connected.)

P : p-channel open drain

C : complementary output