SM8144 データシートの表示（PDF） - Nippon Precision Circuits

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SM8144

EL sheet driver

Nippon Precision Circuits  

BLOCK DIAGRAM

SM8144B

EL sheet

< 80cm2

VDD

LDR

CHV

OUT1 OUT2

Boosting Block

Switching Circuit

Dividing Circuit

1/4

Dividing Circuit

1/1024

Oscillator for

Boosting and EL driving

VSS

OSC

ENA

ROSC

Oscillation Block

ENA from microcontroller

When ENA is logical "H", SM8144B is active.

PIN DESCRIPTION

Pin number Name

I/O

1

CHV

I

2

LDR

O

3

VSS

–

4

OSC

I

5

ENA

I

6

VDD

–

7

OUT2

O

8

OUT1

O

Function

High-voltage DC input

Booster coil driver output

Ground

Coil and EL driver oscillator (oscillator frequency determined by external resistor)

Enable input (built-in pull-down resistor)

Supply

Output 2

Output 1

NIPPON PRECISION CIRCUITS—2

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