ST7282B5 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST7282B5

ROM FROM EPROM

STMicroelectronics 

ST7282A5 - ST7282B5 - ROM FROM EPROM

2.2.2.2 Working with 1/4 Bias

Depending on the selected display material, the

operating mode and the display voltage VLCD, it is

possible to reduce the LCD resistor chain to 4 re-

sistors, and operate with the 1/4 bias method.

If VLCD35 and VLCD25 are connected to the

same voltage, the segment and backplane drivers

will work in the same way as with 1/5 bias, but the

resulting waveforms will look a bit different :

Figure 5. Waveform on common and on segment output working with Bias 1/4

VLCD

VLCD

4/5

4/5

3/5

3/5

2/5

1/5

GND

0 101

SEGMENT SELECTED

2/5

1/5

GND

0101

SEGMENT OFF

VLCD

3/4

VLCD

3/4

ST6LC3 51 .DS4

2/4

1/4

GND

0 101

2/4

1/4

GND

0101

SEGMENT SELECTED

SEGMENT OFF

ST6LC362.DS4

Family

ST7

Issuer Ref.

PG-RO

Chrono

97115

7282A5B5

March 26, 1997

Previous Ref

Edition

Target C

Page 15/23

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