BU9728 Ver la hoja de datos (PDF) - ROHM Semiconductor
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BU9728 Datasheet PDF : 24 Pages
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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
○ 140Segment (SEG35×COM4) Driver BU9795AKV/FV/GUW
BU9728AKV 128Segment (SEG32×COM4) Driver
・・・・・・・P.1
・・・・・・・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=25C, 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
This document is not delivery specifications.
Jul. 2008
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