SM8143A

NIPPON PRECISION CIRCUITS—2

BLOCK DIAGRAM

PIN DESCRIPTION

Pin number

Name

I / O

Function

1

N . C.

–

No connection (must be open)

2

C H V

I

High-voltage DC input

3

N . C.

–

No connection (must be open)

4

L D R

O

Booster coil driver output

5

N . C.

–

No connection (must be open)

6

V S S

–

Ground

7

N . C.

–

No connection (must be open)

8

O C L

I

Coil driver oscillator (oscillator frequency determined by external resistor)

9

O C E

I

EL driver oscillator (oscillator frequency determined by external resistor)

1 0

E N A

I

Enab le input (built-in pull-down resistor)

1 1

V D D

–

Supply

1 2

N . C.

–

No connection (must be open)

1 3

OUT2

O

Output 2

1 4

N . C.

–

No connection (must be open)

1 5

OUT1

O

Output 1

1 6

N . C.

–

No connection (must be open)

VSS

OCL

OCE

VDD

CHV

LDR

OUT2

OUT1

Oscillator for

Boosting

Switching Circuit

Dividing Circuit

1/4

Oscillator for

EL driving

Dividing Circuit

1/1024

ENA

Boosting Block

ENA from microcontroller

EL sheet

<

When ENA is logical "H", SM8143A is active.

Oscillation Block