HT1622
Pad Coordinates
Unit: mil
Pad No.
X
Y
Pad No.
X
Y
1
71.78
59.46
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
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
-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
-71.91
-71.91
-10.67
-4.04
2.59
2
3
52.83
4
39.14
5
23.89
6
16.32
9.22
7
9.69
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
8
3.06
9
-3.57
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
-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
0.94
-5.70
-12.32
-18.95
-25.58
-32.22
-38.85
-45.47
-52.10
-58.74
5.48
15.00
21.63
28.26
34.89
41.52
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.
1
CS
I
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.
2
3
RD
I
I
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.
WR
4
5
DATA
VSS
I/O Serial data input or output with Pull-high resistor
Negative power supply, ground
¾
If the system clock comes from an external clock source, the external clock
source should be connected to the OSCI pad.
6
OSCI
I
7
VDD
Positive power supply
¾
I
8
VLCD
IRQ
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
9
O
O
I
10, 11
12~14
15~22
23~54
BZ, BZ
T1~T3
COM0~COM7
SEG0~SEG31
O
O
LCD common outputs
LCD segment outputs
Rev. 1.40
3
February 6, 2007