HT16L21
Block Diagram
RSTB
VDD
Power_on reset
VDD voltage supported range
VSS
SDA/DIO
SCL/CLK
CSB
IFS
VE bit
Internal RC
Oscillator
I2C or 3-wire
Controller
8
Display RAM
Timing
generator
Column
/Segment
driver
output
COM0
COM3
VLCD
Regulator
SEG0
R
－
＋
OP1
R
LCD
Voltage
Selector
Segment
/LED driver
output
SEG23
SEG24/LED7
－
＋
R
OP0
LCD bias generator
SEG31/LED0
VLCD voltage supported range
Pin Assignment
SEG23
LED7/SEG24
LED6/SEG25
LED5/SEG26
LED4/SEG27
LED3/SEG28
LED2/SEG29
LED1/SEG30
LED0/SEG31
VSS
IFS
CSB
CLK/SCL
DIO/SDA
RSTB
VDD
VLCD
COM0
COM1
COM2
COM3
SEG0
44 43 42 41 40 39 38 37 36 35 34
33
1
32
2
31
3
30
4
29
5
HT16L21
28
44 LQFP
6
27
7
26
8
25
9
24
10
23
11
12 13 14 15 16 17 18 19 20 21 22
SEG22
SEG21
SEG20
SEG19
SEG18
SEG17
SEG16
SEG15
SEG14
SEG13
SEG12
SEG11
SEG10
SEG9
SEG8
SEG7
SEG6
SEG5
SEG4
SEG3
SEG2
SEG1
Rev. 1.10
2
December 27, 2011
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
