HT1621
RAM Mapping 32´4 LCD Controller for I/O mC
Features
· Operating voltage : 2.4V~5.2V · Built-in 256kHz RC oscillator · External 32.768kHz crystal or 256kHz
48 S E G 8 47 S E G 9 46 S E G 10 45 S E G 11 44 S E G 12 43 S E G 13 42 S E G 14 41 S E G 15 40 S E G 16 39 S E G 17 38 S E G 18 37 S E G 19 36 S E G 20 35 S E G 21 34 S E G 22 33 S E G 23 32 S E G 24 31 S E G 25 30 S E G 26 29 S E G 27 28 S E G 28 27 S E G 29 26 S E G 30 25 S E G 31
SEG 7 1 SEG 6 2 SEG 5 3 SEG 4 4 SEG 3 5 SEG 2 6 SEG 1 7 SEG 0 8
CS 9 R D 10 W R 11 D A TA 12 V S S 13 O S C O 14 O S C I 15 V LC D 16 V D D 17 IR Q 1 8 B Z 19 B Z 20 C O M 0 21 C O M 1 22 C O M 2 23 C O M 3 24
5
July 26, 1999
HT1621
Pad Description
Pad No. Pad Name
1
CS
2
RD
3
WR
4
DATA
5
VSS
பைடு நூலகம்
7
OSCI
6
OSCO
8 9 10 11, 12 13~16 48~17
VLCD VDD IRQ BZ, BZ COM0~COM3 SEG0~SEG31
I/O
Function
1
48
2
47
3
46
4
45
5
44
6
43
7
42
8
41
9
40
10
39
11
38
12
37
13
36
14
35
15
34
16
33
17
32
18
31
19
30
20
29
21
28
22
27
23
26
24
25
H T1621 - 48 S S O P
SEG 8 SEG 9 S E G 10 S E G 11 S E G 12 S E G 13 S E G 14 S E G 15 S E G 16 S E G 17 S E G 18 S E G 19 S E G 20 S E G 21 S E G 22 S E G 23 S E G 24 S E G 25 S E G 26 S E G 27 S E G 28 S E G 29 S E G 30 S E G 31
SEG 7 SEG 9 S E G 11 S E G 13 S E G 15 S E G 17 S E G 19 S E G 21 S E G 23 S E G 25 S E G 27 S E G 29 S E G 31 COM 2
3
July 26, 1999
Pad Assignment
HT1621
S E G 15 S E G 14 S E G 13 S E G 12 S E G 11 S E G 10
SEG 9 SEG 8 SEG 7 SEG 6 SEG 5 SEG 4 SEG 3 SEG 2
SEG 1 SEG 0
CS
1 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33
T o n e F re q u e n c y G e n e ra to r
W a tc h d o g T im e r and
T im e B a s e G e n e r a to r
COM 0 COM 3 SEG 0
S E G 31 V LC D
IR Q
Notes:
CS: Chip selection BZ, BZ: Tone outputs WR, RD, DATA: Serial interface COM0~COM3, SEG0~SEG31: LCD outputs IRQ: Time base or WDT overflow output
pad, the data and command transmission between the host con-
troller and the HT1621 are all enabled.
READ clock input with pull-high resistor Data in the RAM of the HT1621 are clocked out on the falling I edge of the RD signal. The clocked out data will appear on the DATA line. The host controller can use the next rising edge to latch the clocked out data.
S E G 29 S E G 30 S E G 31 COM 3 COM 2 COM 1 COM 0
BZ
BZ
IR Q
Chip size: 127 ´ 129 (mil)2 * The IC substrate should be connected to VDD in the PCB layout artwork.
Chip selection input with pull-high resistor
When the CS is logic high, the data and command read from or
I
written to the HT1621 are disabled. The serial interface circuit is also reset. But if CS is at logic low level and is input to the CS
Selection Table
HT162X HT1620 HT1621 HT1622 HT16220 HT1623 HT1625 HT1626 HT1627 HT16270
COM
4
4
8
8
8
8
16
16
16
SEG
32
32
32
32
48
64
48
64
64
Built-in Osc.
Ö
Ö
Ö
Ö
Ö
Ö
Crystal Osc. Ö
6.33 12.96 19.59 58.14 58.14 58.14 58.14 58.14
Y
59.46 22.18 15.56 5.36 -4.51 -11.14 -34.76 -41.90 -49.13 -59.08 -59.08 -59.08 -59.08 -59.08 -59.08 -59.08 -59.08 -59.08 -59.08 -58.44 -51.81 -45.18 -38.55 -31.92
RD 2 WR 3
D ATA 4
(0 ,0 )
VSS 5
O SCO 6
O SCI 7 V LC D 8
VDD 9
10
11
12
13 14 15 16 17 18 19
32 S E G 16 31 S E G 17 30 S E G 18 29 S E G 19 28 S E G 20 27 S E G 21 26 S E G 22 25 S E G 23 24 S E G 24 23 S E G 25 22 S E G 26 21 S E G 27 20 S E G 28
H T1621B - 4 8 S S O P /D IP
HT1621
SEG 5 SEG 3 SEG 1
CS RD WR D ATA VSS V LC D VDD IR Q BZ COM 0 COM 1
1
28
2
27
3
26
4
25
5
24
6
23
7
22
8
21
9
20
10
19
11
18
12
17
13
16
14
15
H T1621D - 2 8 S k in n y
4
July 26, 1999
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
X
-55.04 -58.52 -58.52 -58.52 -58.52 -58.52 -58.52 -58.52 -58.52 -58.52 -44.07 -31.58 -20.70 -13.98 -7.05 -0.34
instructions · R/W address auto increment · Three data accessing modes · VLCD pin for adjusting LCD operating
voltage
General Description