Rev. 1.00

26

November 22, 2011

HT16C21

When the internal VLCD voltage adjustment function is enabled and the Segment/VLCD shared pin is set as

VLCD pin, the bias voltage is supplied by the internal adjusted voltage, derived from the VDD voltage, determined

by the DA3~DA0 bits and the VLCD pin is used as an output pin of which the voltage is detected by the external

MCU host.

●

1/4 duty

LCD panel

COM0~COM3

SEG0~SEG18

COM0~COM3

SEG0~SEG18

SCL

SDA

VDD

VSS

HOST

VDD

VSS

HT16C21

VDD

VSS

0.1uF

VLCD

4.7KΩ

4.7KΩ

●

1/8 duty

LCD panel

COM0~COM7

SEG0~SEG14

COM0~COM7

SEG4~SEG18

SCL

SDA

VDD

VSS

HOST

VDD

VSS

HT16C21

VDD

VSS

0.1uF

VLCD

4.7KΩ

4.7KΩ