ST7282B5 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST7282B5

ROM FROM EPROM

STMicroelectronics 

ST7282A5 - ST7282B5 - ROM FROM EPROM

2.2.2 External Divider Chain

The different display voltage levels are supplied by an external resistor chain as shown in fig. below.

Two different configurations with five or four display voltage levels can be chosen.

The resistors have to have a good matching within < 1% to avoid DC voltage levels on the liquid crystal

device.

DC levels trigger electrode reactions on the liquid crystal cell, deteriorating display quality rapidly.

Figure 3. External Divider Chain

VLCD

VLCD

R5

C4

VLCD45

R4

C3

VLCD35

R3

C2

VLCD25

R2

C1

VLCD15

R1

GND

R4

C3

VLCD45

R3

VLCD35

C2

VLCD25

R2

C1

VLCD15

R1

GND

ST6LCD3 4.DS4

R1 = R2 = R3 = R4 = R5 = 1 ... 200kΩ

C1 = C2 = C3 = C4 = 0.1 ... 0.3µF

Family

ST7

Issuer Ref.

PG-RO

Chrono

97115

7282A5B5

March 26, 1997

Previous Ref

Edition

Target C

Page 13/23

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