SM8145A

NIPPON PRECISION CIRCUITS—2

BLOCK DIAGRAM

PIN DESCRIPTION

Pin number

Name

I / O

Function

1

L D R

O

Booster coil driver output

2

N . C.

–

No connection (must be open)

3

V S S

–

G round

4

N . C.

–

No connection (must be open)

5

OCL1

I

Coil driver oscillator 1 (oscillator frequency determined by external resistor)

6

OCL2

I

Coil driver oscillator 2 (oscillator frequency determined by external resistor)

7

N . C.

–

No connection (must be open)

8

OCL3

I

Coil driver oscillator 3 (oscillator frequency determined by external resistor)

9

O C E

I

EL driver oscillator (oscillator frequency determined by external resistor)

1 0

ENA2

1. Built-in pull-down resistor.

Enab le input 2 (HIGH: enable, LOW : disable)

1 1

ENA1

Enab le input 1 (HIGH: enable, LOW : disable)

1 2

N . C.

–

No connection (must be open)

1 3

V D D

–

Supply

1 4

N . C.

–

No connection (must be open)

1 5

O U T 2

O

Output 2

1 6

O U T C O M

O

Output (common)

1 7

N . C.

–

No connection (must be open)

1 8

O U T 1

O

Output 1

1 9

N . C.

–

No connection (must be open)

2 0

C H V

I

High-voltage DC input

VSS

ENA2

VDD

CHV

LDR

OUTCOM

OUT1

EL 1

High Voltage Switching Circuit

Oscillator

Divider

OUT2

EL 2

Control logic

ENA1

OCE

Divider

Oscillator

OCL2

OCL1

OCL3