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HT9B92 Fiches technique(PDF) 11 Page - Holtek Semiconductor Inc |
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HT9B92 Fiches technique(HTML) 11 Page - Holtek Semiconductor Inc |
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11 / 25 page ![]() 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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