SM8140A

NIPPON PRECISION CIRCUITS—3

BLOCK DIAGRAM

PIN DESCRIPTION

SSOP

chip

Pin Name

i / o

Function

1

11

CHV

i

DC high voltage pin

−

12

MONG

o

Monitor gate

2

13

LDR

o

Step

− up inductor driver output

3

14

VSS1

−

GND

−

4

VSS2

−

GND

4

15

OCL2

o

CR oscillator pin for step

− up inductor and charge pump.

External resistor at this pin determines oscillator frequency.

5

16

OCL1

i

6

1

OCE2

i

CR oscillator pin for output

7

2

OCE1

o

External resistor at this pin determines oscillator frequency

8

3

ENA

1. "ip" defines input pin with pull down internal resistor

Output control pin. Output from OUT1 and OUT2 pins are stopped When "L".

9

5

VDD

−

Power supply pin

10

6

CPO

o

Charge pump output (Voltage output for driving high voltage MOS)

11

7

CP1

o

Charge pump external capacitor pin

12

8

CP2

o

Charge pump external capacitor pin

13

9

OUT2

o

Output for EL

14

10

OUT1

o

Output for EL

Oscillation Circuit

for Voltage Booster

CP1

ENA

Divider

CP2

CPO

Oscillasion Circuit

for output

Divider

Level Shifter

High Voltage

Switching Circuit

Enable Circuit

Charge Pump

Circuit