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HT9B95B Datasheet(PDF) 12 Page - Holtek Semiconductor Inc

Part # HT9B95B
Description  RAM Mapping 39×8 / 43×4 LCD Driver
PDF  32 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT9B95B Datasheet(HTML) 12 Page - Holtek Semiconductor Inc

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Rev. 1.10
12
November 25, 2015
HT9B95A/B/G
LCD Bias Generator
The max voltage level of the LCD driving voltage named as V0 can be adjusted through the LVA command
setting. The full-scale LCD voltage, VOP, is obtained from (V0-VSS).
Fractional LCD biasing voltages, known as 1/3 or 1/4 bias voltage, are obtained from an internal voltage divider
several of series resistors connected between VLCD and VSS. Certain resistors can be switched out of circuits to pro-
ertain resistors can be switched out of circuits to pro-
resistors can be switched out of circuits to pro-
s can be switched out of circuits to pro-
can be switched out of circuits to pro-
switched out of circuits to pro-
switched out of circuits to pro-
s to pro-
to pro-
vide a 1/3 or 1/4 bias voltage level configuration.
LCD Drive Mode Waveforms
• When the LCD drive mode is selected as 1/4 duty and 1/3 bias, the waveform and LCD display is shown as
follows:
SEG n+2
SEG n+2
SEG n
SEG n
COM0
COM0
COM1
COM1
State1
(on)
State1
(on)
State2
(off)
State2
(off)
tLCD
COM2
COM2
SEG n+3
SEG n+3
COM3
COM3
SEG n+1
SEG n+1
V0
V0
2Vop/3
2Vop/3
Vop/3
Vop/3
VSS
VSS
A Type inversion
A Type inversion
SEG n+2
SEG n+2
SEG n
SEG n
COM0
COM0
COM1
COM1
tLCD
COM2
COM2
SEG n+3
SEG n+3
COM3
COM3
SEG n+1
SEG n+1
V0
V0
2Vop/3
2Vop/3
Vop/3
Vop/3
VSS
VSS
V0
V0
2Vop/3
2Vop/3
Vop/3
Vop/3
VSS
VSS
V0
V0
2Vop/3
2Vop/3
Vop/3
Vop/3
VSS
VSS
V0
V0
2Vop/3
2Vop/3
Vop/3
Vop/3
VSS
VSS
V0
V0
2Vop/3
2Vop/3
Vop/3
Vop/3
VSS
VSS
V0
V0
2Vop/3
2Vop/3
Vop/3
Vop/3
VSS
VSS
V0
V0
2Vop/3
2Vop/3
Vop/3
Vop/3
VSS
VSS
V0
V0
2Vop/3
2Vop/3
Vop/3
Vop/3
VSS
VSS
B Type inversion
B Type inversion
V0
V0
2Vop/3
2Vop/3
Vop/3
Vop/3
VSS
VSS
V0
V0
2Vop/3
2Vop/3
Vop/3
Vop/3
VSS
VSS
V0
V0
2Vop/3
2Vop/3
Vop/3
Vop/3
VSS
VSS
V0
V0
2Vop/3
2Vop/3
Vop/3
Vop/3
VSS
VSS
V0
V0
2Vop/3
2Vop/3
Vop/3
Vop/3
VSS
VSS
V0
V0
2Vop/3
2Vop/3
Vop/3
Vop/3
VSS
VSS
V0
V0
2Vop/3
2Vop/3
Vop/3
Vop/3
VSS
VSS
LCD status
LCD status
Waveforms for 1/4 duty drive mode with 1/3 bias (VOP=V0-VSS)
Note: tLCD=1/fLCD



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