HD66421
(RAM-Provided 160 Channel 4-Level Grey Scale Driver for Dot
Matrix Graphics LCD)
ADE-207-300(Z)
Rev.2.0
99.12
Description
The HD66421 drives and controls a dot matrix graphic LCD(Liquid Crystal Display) using a bit-mapped
method. It provides a highly flexible display through its on-chip display RAM, in which each two bits of
data can be used to turn on or off one dot on LCD panel with four-level grey scale.
A single HD66421 can display a maximum of 160x100 dots using its powerful display control functions. It
can display only eight lines out of one hundred lines. This function realize low power consumption because
high voltage for driving LCD is not needed.
An MPU can access HD66421 at any time, because the MPU operations are asynchronous with the
HD66421’s system clock and display operation.
Its low-voltage operation at 2.2 to 5.5V and standby function provides low power dissipation, making the
HD66421 suitable for small portable device applications.
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Built-in bit-mapped display RAM: 30kbits (160
×
100
×
2 bits)
Grey scale display: PWM four-level grey scale can be selected from 32 levels
Grey scale memory management: Packed pixel
Monochrome display: two planes can be selected. One plane is displayed while the other plane is being
written.
Partial display: Eight-lines data can be displayed in any place
An 80-system MPU interface
Power supply voltage for operation : 2.2V to 5.5V
Power supply voltage for LCD : 17 V max.
Selectable multiplex duty ratio: 1/8, 1/64, 1/80, 1/100
LCD driving alternating cycle: 7, 11, 13 lines or flame
Built-in oscillator: external resister
Low power consumption:
Circuits for generating LCD driving voltage : Contrast control, Operational amplifier, and Resistive
dividers
Internal resistive divider: programmable bias rate
32-level programmable contrast control
1
HD66421
Pad Arrangement
Chip Size
Coordinate
Origin
BUMP Size
: 8.99
×
4.72 mm
: Pad center
: Chip center
: GND1, GND8, dummy A, dummy B
Power, I/O (Pad No. 276 to 321)
COM1 - 100, SEG1 - 160, dummy 1- 12
GND7
GND8
COM1
Type code
HD66421
70
×
70
µm
50
×
70
µm
35
×
50
µm
GND2
GND1
COM100
SEG24
dymmyA
dymmy1
dymmy12
SEG137
dymmy8
Pad Location Coordinate
Pin Pad
No. Name
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
COM1
COM2
COM3
COM4
COM5
COM6
COM7
COM8
COM9
COM10
COM11
COM12
COM13
COM14
COM15
COM16
COM17
COM18
COM19
COM20
COM21
COM22
COM23
Coordinate
X
–4217
–4217
–4217
–4217
–4217
–4217
–4217
–4217
–4217
–4217
–4217
–4217
–4217
–4217
–4217
–4217
–4217
–4217
–4217
–4217
–4217
–4217
–4217
Y
1731
1681
1631
1581
1531
1481
1430
1380
1330
1280
1230
1180
1130
1080
1030
980
930
880
830
780
730
680
630
Pin Pad
No. Name
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
COM24
COM25
COM26
COM27
COM28
COM29
COM30
COM31
COM32
COM33
COM34
COM35
COM36
COM37
COM38
COM39
COM40
COM41
COM42
COM43
COM44
COM45
COM46
Coordinate
X
–4217
–4217
–4217
–4217
–4217
–4217
–4217
–4217
–4217
–4217
–4217
–4217
–4217
–4217
–4217
–4217
–4217
–4217
–4217
–4217
–4217
–4217
–4217
Y
580
530
480
430
380
330
280
230
179
129
79
29
–21
–71
–121
–171
–221
–271
–321
–371
–421
–471
–521
Pin Pad
No. Name
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
COM47
COM48
COM49
COM50
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
SEG9
SEG10
SEG11
SEG12
SEG13
SEG14
SEG15
SEG16
SEG17
SEG18
SEG19
Coordinate
X
–4217
–4217
–4217
–4217
–4217
–4217
–4217
–4217
–4217
Y
–571
–621
–671
–721
–798
–848
–898
–948
–998
Pin Pad
No. Name
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
SEG20
SEG21
SEG22
SEG23
SEG24
dummyA
dummy1
dummy2
dummy3
dummy4
dummy5
dummy6
SEG25
SEG26
SEG27
SEG28
SEG29
SEG30
SEG31
SEG32
SEG33
SEG34
SEG35
Coordinate
X
–4217
–4217
–4217
–4217
–4217
–4217
–4029
–3907
–3827
–3619
–3497
–3419
–2822
–2772
–2722
–2672
–2622
–2572
–2522
–2472
–2422
–2372
–2322
Y
–1749
–1799
–1849
–1899
–1949
–2082
–2082
–2082
–2082
–2082
–2075
–2075
–2082
–2082
–2082
–2082
–2082
–2082
–2082
–2082
–2082
–2082
–2082
–4217 –1049
–4217 –1099
–4217 –1149
–4217 –1199
–4217 –1249
–4217 –1299
–4217 –1349
–4217 –1399
–4217 –1449
–4217 –1499
–4217 –1549
–4217 –1599
–4217 –1649
–4217 –1699
4