SM1350 series

NIPPON PRECISION CIRCUITS—3

PIN DESCRIPTION

Number

Name

I/O

1. U = pull-up resistor connection, SU : pull-up resistor connection only when melody output starts,

P = p-channel open drain, C = complementary output.

U or O = pull-up resistance or open drain (master slice)

2. BTL/A-class output mode is selected by mask option.

1

VDD

–

–

Supply pin

2S0

I

SU

Binary select mode: Phrase select pins.

Serial select mode: S0 and S1 control melody output.

3S1

I

SU

4S2

I

SU

5S3

I

SU

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 or O

One-shot melody mode: Melody output stop control.

Level hold melody mode: Invalid input.

9

STN

I

U or O

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 adjust control. Volume adjusted using an external resistor.

15

SPN

O

P

9-bit D/A converter output in BTL output mode.

VOL current output in A-class output mode.

16

SP

O

P

BTL output mode: 9-bit D/A converter output.

A-class output mode: 10-bit D/A converter output.

17

MSB

O

C

BTL output mode: Signed-bit output. HIGH when no melody is output.

I

U

A-class output mode: BUSYIN input

18

MSBN

O

C

BTL output mode: Signed-bit output. HIGH when no melody is output.

A-class output mode: ENDN output. HIGH when no melody is output.

19

T1N

I

U

Test signal inputs

20

T2N

I

U

21

T3N

I

U

22

TO

O

C

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

23

XTN

O

–

Oscillator output

24

XT

I

–

Oscillator input