BU9728AKV_08 datasheet(4/24 Pages) ROHM

Part #	BU9728AKV

Description	For 128-140 Segment type LCD LCD Segment Driver

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Manufacturer	ROHM [Rohm]

Direct Link	http://www.rohm.com

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Block Diagram (BU9728AKV)

●Pin Arrangement (BU9728AKV)

Fig. BU9728AKV-5 Block diagram

Fig. BU9728AKV-6

arrangement

●

Terminal description (BU9728AKV)

Terminal

No.

Type

Function

OSC1

OSC2

1

2

I

O

Int clock use mode, connect resister between OSC1 and OSC2.

Ext clock use mode, input clock from OSC1, OSC2 keep OPEN.

V1～V3

3～5

Power supply for LCD driving.

Keep VDD≧V1≧V2≧V3≧VSS condition.

VSS

6

VSS terminal

VDD

7

VDD terminal

SCK

8

I

Serial clock input

SD

9

I

Serial data input

CS

_________

10

I

Chip select input “L”: active

C

_____

/

____

D

_____

11

I

Command data judgment input

“L”: display data, “H”: command

COM0～3

12～15

O

LCD COMMON output

RESET

16

I

Reset input terminal.

It will be initialized with "L" level input.

Reset address counter, Set display off status.

SEG0～

31

17～48

O

LCD SEGMENT output

Serial

Interface

SD

SCK

C/D

CS

Command/Data

Register

Command

Decoder

Address

Counter

Timing

Generator

Common

Counter

Display Data RAM

(DD RAM)

LCD

Segment

Driver

32bits

SEG0

SEG1

SEG31

LCD

Common

Driver

4bits

COM1

COM2

COM0

COM3

LCD Driver

Bias Circuit

VSS

V1

VDD

V2

V3

RESET

123456789

10

11

12

13

14

15

16

24

23

22

21

20

19

18

17

COM1

COM2

COM3

SEG7

SEG1

SEG2

SEG20

SEG21

SEG22

SEG23

SEG24

SEG25

SEG26

SEG27

SEG3

SEG4

SEG5

SEG6

RESET

SEG0

36

35

34

33

32

31

30

29

28

27

26

25

SEG28

SEG29

SEG30

SEG31

47

46

45

44

48

37

38

39

40

41

42

43

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