TECHNICAL NOTE

LCD Segment Driver series

For 128～140 Segment type LCD

LCD Segment Driver

BU9728AKV, BU9795AKV/FV/GUW

● Outline

This is LCD segment driver for 126 to 140 segment type display. There is a lineup which is suitable for

multi function display and is integrated display RAM and power supply circuit for LCD driving with 4

common output type: BU9728AKV and BU9795AKV/FV/GUW.

○ 128Segment (SEG32×COM4) Driver BU9728AKV

・・・・・・・

P.1

○ 140Segment (SEG35×COM4) Driver BU9795AKV/FV/GUW

・・・・・・・

P.10

● Feature (BU9728AKV)

1) 4wire serial interface (SCK, SD, C

_____

/

____

D

_____

, CS

__________

)

2) Integrated RAM for display data (DDRAM) : 32 × 4bit (Max 128 Segment)

3) LCD driving port: 4 Common output, 32 Segment output

4) Display duty: 1/4 duty

5) Integrated Oscillator circuit (external resister type)

6) Integrated Power supply circuit for LCD driving (1/3 bias)

7) Low voltage / low power consumption design: +2.5～5.5V

● Uses (BU9728AKV)

DVC, Car audio, Telephone

● Absolute Maximum Ratings (Ta=25degree, VSS=0V) (BU9728AKV)

Parameter

Symbol

Limits

Unit

Remarks

Power Supply Voltage1

VDD

-0.3 ～ +7.0

V

Power supply

Power Supply Voltage2

VLCD

-0.3 ～ +7.0

V

LCD drive voltage

Allowable loss

Pd

400

mW

When use more than Ta=25

C, subtract

4mW per degree.

Operational temperature range

Topr

-40 ～ +85

degree

Storage temperature range

Tstg

-55 ～ +125

degree

Input voltage range

VIN

-0.3 to VDD+0.3

V

Output voltage range

VOUT

-0.3 to VDD+0.3

V

*This product is not designed against radioactive ray.

● Recommend operating conditions (Ta=25degree, VSS=0V) (BU9728AKV)

Parameter

Symbol

MIN

TYP

MAX

Unit

Remarks

Power Supply Voltage1

VDD

2.5

-

5.5

V

Power Supply Voltage2

VLCD

0

-

VDD

V

VDD≧V1≧V2≧V3≧VSS

Oscillator frequency

fOSC

-

36

-

KHz

Rf=470kΩ

Jul. 2008

This document is not delivery specifications.