BU9728 View Datasheet(PDF) - ROHM Semiconductor

Part Name

Description

Manufacturer

BU9728

For 128～ 140 Segment type LCD, LCD Segment Driver

ROHM Semiconductor 

* BU9795AGUW

● Block Diagram

VDD

LCD voltage generator

COM0……COM3

SEG2……SEG32

common

driver

Segment

driver

VLCD

INHb

OSCIN

VSS

＋

－

LCD

BIAS

SELECTOR

＋

common blink timing

DDRAM

counter

generator

－

OSCILLATOR

Power On Reset

Command

register

Command

Data Decoder

serial inter face

IF FILTER

TEST

CSB

SD

SCL

Fig. BU9795AKV /AFV /AGUW-2C

BU9795AGUW Block diagram

● Pin Arrangement

1

2

3

4

5

6

7

G (NC) SEG13 SEG15 SEG18 SEG20 SEG22 (NC)

F SEG11 SEG12 SEG16 SEG17 SEG21 SEG23 SEG24

E SEG9 SEG10 SEG14 SEG19 SEG25 SEG27 SEG26

D SEG7 SEG6 SEG8 SEG5 SEG30 SEG28 SEG29

C SEG4 SEG3 SEG2 CSB COM3 SEG32 SEG31

B

INHb

SD

VSS VDD COM1 COM0

A (NC) TEST2 SCL OSCIO VLCD COM2 (NC)

Fig. BU9795AKV /AFV /AGUW-3C

BU9795AGUW Pin arrangement

● Terminal description

Terminal

I/O

Function

INHb

TEST

OSCIO

SD

I

Input terminal for turn off display

H: turn on display L: turn off display

I

Test input (ROHM use only)

Must be connect to VSS

External clock input

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

Must be connect to VSS when use internal oscillation circuit.

I serial data input

SCL

I serial data transfer clock

CSB

I Chip select : “L” active

VSS

GND

VDD

Power supply

VLCD

I Power supply for LCD driving

SEG2-32

O SEGMENT output for LCD driving

COM0-3

O COMMON output for LCD driving

(Caution) About terminal number, please refer to above pin arrangement

14/23

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