HT1622
Pad Coordinates
Pad No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
X
-68.43
-68.43
-68.43
-69.19
-69.36
-69.36
-69.36
-69.36
-69.36
-69.36
-69.36
-69.36
-69.36
-69.36
-69.36
-69.36
-39.23
-32.60
-20.19
-13.56
-1.15
5.48
15.00
21.63
28.26
34.89
41.52
Y
71.78
59.46
52.83
39.14
23.89
16.32
9.69
3.06
-3.57
-16.92
-33.83
-43.52
-50.15
-56.78
-63.41
-70.04
-71.14
-71.14
-71.14
-71.14
-71.14
-71.14
-71.91
-71.91
-71.91
-71.91
-71.91
Pad No.
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
X
48.15
54.78
69.32
69.32
69.32
69.32
69.32
69.32
69.32
69.32
69.32
69.32
69.32
69.32
69.32
14.19
7.57
0.94
-5.70
-12.32
-18.95
-25.58
-32.22
-38.85
-45.47
-52.10
-58.74
Y
-71.91
-71.91
-10.67
-4.04
2.59
9.22
15.85
22.48
29.11
35.74
42.37
49.00
55.63
62.26
68.89
71.78
71.78
71.78
71.78
71.78
71.78
71.78
71.78
71.78
71.78
71.78
71.78
Unit: mil
Pad Description
Pad No.
Pad Name
I/O
Description
Chip selection input with Pull-high resistor. When the CS is logic high, the
data and command read from or written to the HT1622 are disabled. The se-
rial interface circuit is also reset. But if CS is at logic low level and is input to
the CS pad, the data and command transmission between the host controller
and the HT1622 are all enabled.
READ clock input with Pull-high resistor. Data in the RAM of the HT1622 are
clocked out on the falling edge of the RD signal. The clocked out data will ap-
pear on the data line. The host controller can use the next rising edge to latch
the clocked out data.
WRITE clock input with Pull-high resistor. Data on the DATA line are latched
into the HT1622 on the rising edge of the WR signal.
Serial data input or output with Pull-high resistor
Negative power supply, ground
If the system clock comes from an external clock source, the external clock
source should be connected to the OSCI pad.
Positive power supply
LCD operating voltage input pad
Time base or Watchdog Timer overflow flag, NMOS open drain output
2kHz or 4kHz tone frequency output pair
Not connected
LCD common outputs
LCD segment outputs
1
CS
I
2
RD
I
3
4
5
6
7
8
9
10, 11
12~14
15~22
23~54
WR
DATA
VSS
OSCI
VDD
VLCD
IRQ
BZ, BZ
T1~T3
COM0~COM7
SEG0~SEG31
I
I/O
¾
I
¾
I
O
O
I
O
O
Rev. 1.40
3
February 6, 2007
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
