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HT9B92 Datasheet(PDF) 11 Page - Holtek Semiconductor Inc

Part # HT9B92
Description  RAM Mapping 36횞4 LCD Driver
PDF  25 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT9B92 Datasheet(HTML) 11 Page - Holtek Semiconductor Inc

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Rev. 1.20
11
November 25, 2015
HT9B92
LCD Bias Generator
FractionalLCDbiasingvoltages,knownas1/2or1/3biasvoltage,areobtainedfromaninternalvoltagedivider
ofthreeseriesresistorsconnectedbetweenVLCDandVDD.Thecentreresistorcanbeswitchedoutofcircuitsto
providea1/2biasvoltagelevelconfiguration.
LCD Drive Mode Waveforms
• WhentheLCDdrivemodeisselectedas1/4dutyand1/2bias,thewaveformandLCDdisplayisshownasfollows:
SEG n+2
SEG n+2
SEG n
SEG n
COM0
COM0
COM1
COM1
State1
(on)
State1
(on)
State2
(off)
State2
(off)
LCD segment
LCD segment
tLCD
COM2
COM2
SEG n+3
SEG n+3
COM3
COM3
SEG n+1
SEG n+1
VDD
VDD
Vop/2
Vop/2
VLCD
VLCD
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
VDD
VDD
VLCD
VLCD
VDD
VDD
VLCD
VLCD
VDD
VDD
VLCD
VLCD
VDD
VDD
VLCD
VLCD
VDD
VDD
VLCD
VLCD
VDD
VDD
VLCD
VLCD
VDD
VDD
VLCD
VLCD
VDD
VDD
Vop/2
Vop/2
VLCD
VLCD
B Type inversion
B Type inversion
VDD
VDD
Vop/2
Vop/2
VLCD
VLCD
VDD
VDD
Vop/2
Vop/2
VLCD
VLCD
VDD
VDD
Vop/2
Vop/2
VLCD
VLCD
VDD
VDD
Vop/2
Vop/2
VLCD
VLCD
VDD
VDD
Vop/2
Vop/2
VLCD
VLCD
VDD
VDD
Vop/2
Vop/2
VLCD
VLCD
VDD
VDD
Vop/2
Vop/2
VLCD
VLCD
Vop/2
Vop/2
Vop/2
Vop/2
Vop/2
Vop/2
Vop/2
Vop/2
Vop/2
Vop/2
Vop/2
Vop/2
Vop/2
Vop/2
Waveforms for 1/4 duty drive mode with 1/2 bias (VOP=VDD-VLCD)
Note: tLCD=1/fLCD



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