SM8142

NIPPON PRECISION CIRCUITS—3

BLOCK DIAGRAM

I

SM8142A

I

SM8142B

PIN DESCRIPTION

VSS

OCL

OCE

VDD

CHV

LDR

OUT2

OUT1

EL sheet

Oscillator for

Boosting Voltage

High Voltage

Switching Circuit

Dividing Circuit

Oscillator for

EL Driving

Dividing Circuit

VSS

OSC

ENA

VDD

CHV

LDR

OUT2

OUT1

EL sheet

Oscillator for

Boosting Voltage and EL Driving

High Voltage

Switching Circuit

Dividing Circuit

Dividing Circuit

Pin number

V er.

N a m e

I / O

Function

VSOP-8

SON-8

1

7

A / B

C H V

I

High-voltage DC input

2

8

A / B

L D R

O

Booster coil driver output

3

1

A / B

V S S

–

G round

42

A

O C L

I

Coil driver oscillator (oscillator frequency determined by external resistor)

B

OSC

I

Coil and EL driver oscillator

(oscillator frequency determined by external resistor)

53

A

O C E

I

EL driver oscillator (oscillator frequency determined by external resistor)

B

ENA

1. Built-in pull-down resistor

E n a b le input (HIGH: enable, LOW : disable)

6

4

A / B

V D D

–

Supply

7

5

A / B

O U T 2

O

Output 2

8

6

A / B

O U T 1

O

Output 1