HT16C22 datasheet(13/30 Pages) HOLTEK

13 / 30 page

Rev. 1.20

May 10, 2011

HT16C22/HT16C22G

SEG n+2

VLCD

VSS

SEG n

COM0

COM1

State1

(on)

State1

(on)

State2

(off)

State2

(off)

LCD segment

tLCD

COM2

SEG n+3

COM3

SEG n+1

(VLCD+VSS)/2

VLCD

VSS

(VLCD+VSS)/2

VLCD

VSS

(VLCD+VSS)/2

VLCD

VSS

(VLCD+VSS)/2

VLCD

VSS

(VLCD+VSS)/2

VLCD

VSS

(VLCD+VSS)/2

VLCD

VSS

(VLCD+VSS)/2

VLCD

VSS

(VLCD+VSS)/2

LCD Bias Generator

The full-scale LCD voltage (Vop) is obtained from VLCD – VSS. The LCD voltage may be temperature compensated

externally through the Voltage supply to the VLCD pin.

Fractional LCD biasing voltages are obtained from an internal voltage divider of three series resistors connected

between VLCD and VSS. The centre resistor can be switched out of the circuits to provide a 1/2 bias voltage level for

the 1/4 duty conﬁguration.

LCD Drive Mode Waveforms

●

When two columns are provided in the LCD, the 1/4duty drive mode applies. The HT16C22/HT16C22G can use

1/2 or 1/3

bias types in output waveforms as shown as follows:

Waveforms for 1/4 duty drive mode with1/2 bias (VOP=VLCD-VSS)

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