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
VDD
0.1uF
VDD
VDD
4.7KΩ
4.7KΩ
COM0~COM3
COM0~COM3
SCL
HOST
HT16C21
LCD panel
SDA
VLCD
SEG0~SEG18
SEG0~SEG18
VSS
VSS
VSS
● 1/8 duty
VDD
0.1uF
VDD
HOST
VSS
VDD
4.7KΩ
4.7KΩ
COM0~COM7
COM0~COM7
SCL
HT16C21
LCD panel
SDA
VLCD
SEG4~SEG18
SEG0~SEG14
VSS
VSS
Rev. 1.00
26
November 22, 2011