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ST7282 Datasheet(PDF) 13 Page - STMicroelectronics

No. de pieza ST7282
Descripción Electrónicos  ROM FROM EPROM
PDF  23 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST7282 Datasheet(HTML) 13 Page - STMicroelectronics

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ST7282A5 - ST7282B5 - ROM FROM EPROM
Family
Issuer Ref.
Chrono
March 26, 1997
Previous Ref
Edition
ST7
PG-RO
97115
7282A5B5
Target C
Page 13/23
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
R1 = R2 = R3 = R4 = R5 = 1 ... 200kΩ
C1 = C2 = C3 = C4 = 0.1 ... 0.3µF
VLCD
VLCD
C4
C3
C2
C1
C3
C2
C1
R5
R4
R3
R2
R1
VLCD45
VLCD35
VLCD25
VLCD15
VLCD45
VLCD35
VLCD25
VLCD15
GND
GND
R4
R3
R2
R1
ST6LCD3 4.DS4



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