HT16C21
When the LCD drive mode is selected as 1/8 duty and 1/4bias, the waveform and LCD display is shown as
●
follows:
tLCD
LCD segment
LCD segment
V
LCD
LCD
V
State1
V
LCD- Vop/4
State1
(on)
V
LCD- Vop/4
(on)
COM0
COM0
V
LCD- 2Vop/4
LCD- 2Vop/4
V
V
LCD- 3Vop/4
LCD- 3Vop/4
V
V
SS
V
SS
V
LCD
V
LCD
State2
V
LCD- Vop/4
State2
(off)
V
LCD- Vop/4
(off)
COM1
COM1
V
LCD- 2Vop/4
LCD- 2Vop/4
V
V
LCD- 3Vop/4
LCD- 3Vop/4
V
V
SS
V
SS
V
LCD
V
LCD
V
LCD- Vop/4
V
LCD- Vop/4
COM2
COM2
V
LCD- 2Vop/4
LCD- 2Vop/4
V
V
LCD- 3Vop/4
LCD- 3Vop/4
V
V
SS
V
SS
V
LCD
V
LCD
V
LCD- Vop/4
V
LCD- Vop/4
COM3
COM3
V
LCD- 2Vop/4
LCD- 2Vop/4
V
V
LCD- 3Vop/4
LCD- 3Vop/4
V
V
SS
V
SS
V
LCD
V
LCD
V
LCD- Vop/4
V
LCD- Vop/4
COM4
COM4
V
LCD- 2Vop/4
LCD- 2Vop/4
V
V
LCD- 3Vop/4
LCD- 3Vop/4
V
V
SS
V
SS
V
LCD
V
LCD
V
LCD- Vop/4
V
LCD- Vop/4
COM5
COM5
V
LCD- 2Vop/4
LCD- 2Vop/4
V
V
LCD- 3Vop/4
LCD- 3Vop/4
V
V
SS
V
SS
V
LCD
V
LCD
V
LCD- Vop/4
V
LCD- Vop/4
COM6
COM6
V
LCD- 2Vop/4
LCD- 2Vop/4
V
V
LCD- 3Vop/4
LCD- 3Vop/4
V
V
SS
V
SS
V
LCD
V
LCD
V
LCD- Vop/4
V
LCD- Vop/4
COM7
COM7
V
LCD- 2Vop/4
LCD- 2Vop/4
V
V
LCD- 3Vop/4
LCD- 3Vop/4
V
V
SS
V
SS
V
LCD
V
LCD
V
LCD- Vop/4
V
LCD- Vop/4
SEG n
SEG n
V
LCD- 2Vop/4
LCD- 2Vop/4
V
V
LCD- 3Vop/4
LCD- 3Vop/4
V
V
SS
V
SS
V
LCD
V
LCD
V
LCD- Vop/4
V
LCD- Vop/4
SEG n+1
SEG n+1
V
LCD- 2Vop/4
LCD- 2Vop/4
V
V
LCD- 3Vop/4
LCD- 3Vop/4
V
V
SS
V
SS
V
LCD
V
LCD
V
LCD- Vop/4
V
LCD- Vop/4
SEG n+2
SEG n+2
V
LCD- 2Vop/4
LCD- 2Vop/4
V
V
LCD- 3Vop/4
LCD- 3Vop/4
V
V
SS
V
SS
V
LCD
V
LCD
V
LCD- Vop/4
V
LCD- Vop/4
SEG n+3
SEG n+3
V
LCD- 2Vop/4
LCD- 2Vop/4
V
V
LCD- 3Vop/4
LCD- 3Vop/4
V
V
SS
SS
V
Waveforms for 1/8 duty drive mode with1/4 bias (VOP = VLCD−VSS
)
Note: tLCD = 1/fLCD
Rev. 1.00
12
November 22, 2011
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
