HT1330
Pin/Pad Description
Pin No. Pad No. Pad Name I/O
Description
Input to start/stop the timer
I
I
11
14
16
17
18
20
24
25
26
27
28
29
30
31
33
34
35
36
37
38
39
46
47
4
1
S3
Input for minute setting
Input for hour setting
Negative voltage supply for LCD display
For voltage doubling capacitor
For voltage doubling capacitor
Common 1 drive
2
S2
I
3
S1
¾
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
I
4
VEE
CAP2
CAP1
COM1
BC3
AG3
FE3
BC2
ADG2
FE2
COD3
BC1
AG1
FE1
KD1
COM2
OSC1
OSC2
BUSY
T2
5
6
7
Segment drive
8
Segment drive
9
Segment drive
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
Segment drive
Segment drive
Segment drive
Segment drive
Segment drive
Segment drive
Segment drive
Segment drive
Common 2 drive
Oscillator input
O
O
Oscillator output
Timer busy flag, active high
I/O Chip test pin
I/O Fast-test control pin
T1
Negative power supply
Positive power supply
Option pin for countdown recycle
Piezo drive
¾
¾
I
5
VSS
VDD
OP
6
8
O
O
9
BZ
Piezo drive
10
BZB
3
August 10, 2000
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
