BU9795 데이터 시트보기 (PDF) - ROHM Semiconductor

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BU9795

For 128～ 140 Segment type LCD, LCD Segment Driver

ROHM Semiconductor 

* BU9795AFV

● Block Diagram

VDD

LCD voltage generator

COM0……COM3

SEG4……SEG30

common

driver

Segment

driver

VLCD

INHb

OSCIN

VSS

＋

－

LCD

BIAS

SELECTOR

＋

common blink timing

DDRAM

counter

generator

－

OSCILLATOR

Power On Reset

TEST

Command

register

Command

Data Decoder

serial inter face

IF FILTER

CSB

SD

SCL

Fig. BU9795AKV /AFV /AGUW-2B

BU9795AFV Block diagram

● Pin Arrangement

40

21

1

20

Fig. BU9795AKV /AFV /AGUW-3B

BU9795AFV Pin arrangement

● Terminal description

Terminal

INHb

TEST

OSCIO

SD

SCL

CSB

VSS

VDD

VLCD

SEG4-30

COM0-3

Terminal

No.

I/O

Function

36

I

Input terminal for turn off display

H: turn on display L: turn off display

35

I

Test input (ROHM use only)

Must be connect to VSS

External clock input

31

I Ex clock and Int clock can be changed by command.

Must be connect to VSS when use internal oscillation circuit.

34

I serial data input

33

I serial data transfer clock

32

I Chip select : “L” active

30

GND

29

Power supply

28

I Power supply for LCD driving

1-23,

37-40

24-27

O SEGMENT output for LCD driving

O COMMON output for LCD driving

13/23

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