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HT1670
12832 LCD Controller for I/O MCU
Rev. 1.10
1
September 17, 2004
Features
Operating voltage: 2.7V~5.2V
Built-in 32kHz RC oscillator
External 32.768kHz crystal oscillator or 32kHz fre-
quency source input
Standby current: <1
mA at 3V, <2mA at 5V
Internal resistor type: 1/6 bias or 1/5 bias, 1/32 duty,
and 1/16 duty
Three selectable LCD frame frequencies: 64Hz,
89Hz or 170Hz
Max. 128
32 patterns, 128 segments and 32 com-
mons
144 segments and 16 commons selectable by com-
mand method
Built-in bit-map display RAM: 4096 bits (=128
32 bits)
Built-in internal resistor type bias generator
Six-wire interface (four data wires)
Eight kinds of time base/WDT selection
Time base or WDT overflow output
R/W address auto increment
Built-in buzzer driver (2kHz/4kHz)
Power down command reduces power consumption
Software configuration feature
Data mode and Command mode instructions
Three data accessing modes
Provides VLCD pin to adjust LCD operating voltage
and max. VLCD voltage up to 7V
Provides three kinds of bias current programming
Control of TN-type and STN-type LCDs
208-pin QFP package
General Description
HT1670 is a peripheral device specially designed for I/O
type MCU used to expand the display capability. The
max. display segment of the device are 4096 patterns
(128 segments and 32 commons). It also supports four
data bits interface, buzzer sound, Watchdog Timer or
time base timer functions. The HT1670 is a memory
mapping and multi-function LCD controller. Since the
HT1670 can control TN-type (Twisted Nematic) or
STN-type (Super Twisted Nematic) LCDs. The software
configuration feature of the HT1670 make it suitable for
multiple LCD applications including LCD modules and
display subsystems. Only six lines (CS, WR, DB0~DB3)
are required for the interface between the host controller
and the HT1670.
Applications
Leisure products
Games
Personal digital assistant
Cellular phone
Global positioning system
Consumer electronics
Block Diagram
Pin Assignment
HT1670
Rev. 1.10
2
September 17, 2004
W a t c h d o g T i m e r
&
T i m e B a s e G e n e r a t o r
D i s p l a y R A M
L C D D r i v e r /
B i a s C i r c u i t
C o n t r o l
&
T i m i n g
C i r c u i t
W R
O S C I
C S
R D
C O M 0
C O M 3 1
S E G 0
S E G 1 2 7
T o n e F r e q u e n c y
G e n e r a t o r
B Z
B Z
I R Q
V S S
V D D
V L C D
O S C O
D B 0
D B 3
N o t e : C S : C h i p s e l e c t i o n
B Z , B Z : T o n e o u t p u t s
W R , R D : W R I T E c l o c k , R E A D c l o c k
D B 0 ~ D B 3 : D a t a b u s
C O M 0 ~ C O M 3 1 , S E G 0 ~ S E G 1 2 7 : L C D o u t p u t s
I R Q : T i m e b a s e o r W D T o v e r f l o w o u t p u t
1 5 6
1 5 5
1 5 4
1 5 3
1 5 2
1 5 1
1 5 0
1 4 9
1 4 8
1 4 7
1 4 6
1 4 5
1 4 4
1 4 3
1 4 2
1 4 1
1 4 0
1 3 9
1 3 8
1 3 7
1 3 6
1 3 5
1 3 4
1 3 3
1 3 2
1 3 1
1 3 0
1 2 9
1 2 8
1 2 7
1 2 6
1 2 5
1 2 4
1 2 3
1 2 2
1 2 1
1 2 0
1 1 9
1 1 8
1 1 7
1 1 6
1 1 5
1 1 4
1 1 3
1 1 2
1 1 1
1 1 0
1 0 9
1 0 8
1 0 7
1 0 6
1 0 5
2 0 8
1
2
3
4
5
6
7
8
9
1 0
1 1
1 2
1 3
1 4
1 5
1 6
1 7
1 8
1 9
2 0
2 1
2 2
2 3
2 4
2 5
2 6
2 7
2 8
2 9
3 0
3 1
3 2
3 3
3 4
3 5
3 6
3 7
3 8
3 9
4 0
4 1
4 2
4 3
4 4
4 5
4 6
4 7
4 8
4 9
5 0
5 1
5 2
5 3
2 0 7 2 0 6 2 0 5 2 0 4 2 0 3 2 0 2 2 0 1 2 0 0 1 9 9 1 9 8 1 9 7 1 9 6 1 9 5 1 9 4 1 9 3 1 9 2 1 9 1 1 9 0 1 8 9 1 8 8 1 8 7 1 8 6 1 8 5 1 8 4 1 8 3 1 8 2 1 8 1 1 8 0 1 7 9 1 7 8 1 7 7 1 7 6 1 7 5 1 7 4 1 7 3 1 7 2 1 7 1 1 7 0 1 6 9 1 6 8 1 6 7 1 6 6 1 6 5 1 6 4 1 6 3 1 6 2 1 6 1 1 6 0 1 5 9 1 5 8 1 5 7
H T 1 6 7 0
2 0 8 Q F P - A
5 4 5 5 5 6 5 7 5 8 5 9 6 0 6 1 6 2 6 3 6 4 6 5 6 6 6 7 6 8 6 9 7 0 7 1 7 2 7 3 7 4 7 5 7 6 7 7 7 8 7 9 8 0 8 1 8 2 8 3 8 4 8 5 8 6 8 7 8 8 8 9 9 0 9 1 9 2 9 3 9 4 9 5 9 6 9 7 9 8 9 9
1 0 0 1 0 1 1 0 2 1 0 3 1 0 4
C O M 2 2
C O M 2 1
C O M 2 0
C O M 1 9
C O M 1 8
C O M 1 7
C O M 1 6
N C
N C
N C
N C
N C
N C
N C
N C
N C
C S
R D
W R
D B 0
D B 1
D B 2
D B 3
V S S
O S C I
O S C O
V D D
V L C D
I R Q
B Z
B Z
T 1
T 2
T 3
T 4
T 0 0 0
V L C D
N C
N C
N C
N C
N C
N C
N C
N C
C O M 0
C O M 1
C O M 2
C O M 3
C O M 4
C O M 5
C O M 6
S
E
G
4
2
S
E
G
4
1
S
E
G
4
0
S
E
G
3
9
S
E
G
3
8
S
E
G
3
7
S
E
G
3
6
S
E
G
3
5
S
E
G
3
4
S
E
G
3
3
S
E
G
3
2
S
E
G
3
1
S
E
G
3
0
S
E
G
2
9
S
E
G
2
8
S
E
G
2
7
S
E
G
2
6
S
E
G
2
5
S
E
G
2
4
S
E
G
2
3
S
E
G
2
2
S
E
G
2
1
S
E
G
2
0
S
E
G
1
9
S
E
G
1
8
S
E
G
1
7
S
E
G
1
6
S
E
G
1
5
S
E
G
1
4
S
E
G
1
3
S
E
G
1
2
S
E
G
1
1
S
E
G
1
0
S
E
G
9
S
E
G
8
S
E
G
7
S
E
G
6
S
E
G
5
S
E
G
4
S
E
G
3
S
E
G
2
S
E
G
1
S
E
G
0
C
O
M
1
5
C
O
M
1
4
C
O
M
1
3
C
O
M
1
2
C
O
M
1
1
C
O
M
1
0
C
O
M
9
C
O
M
8
C
O
M
7
S E G 8 4
S E G 8 3
S E G 8 2
S E G 8 1
S E G 8 0
S E G 7 9
S E G 7 8
S E G 7 7
S E G 7 6
S E G 7 5
S E G 7 4
S E G 7 3
S E G 7 2
S E G 7 1
S E G 7 0
S E G 6 9
S E G 6 8
S E G 6 7
S E G 6 6
S E G 6 5
S E G 6 4
N C
N C
N C
N C
N C
N C
N C
N C
N C
N C
S E G 6 3
S E G 6 2
S E G 6 1
S E G 6 0
S E G 5 9
S E G 5 8
S E G 5 7
S E G 5 6
S E G 5 5
S E G 5 4
S E G 5 3
S E G 5 2
S E G 5 1
S E G 5 0
S E G 4 9
S E G 4 8
S E G 4 7
S E G 4 6
S E G 4 5
S E G 4 4
S E G 4 3
S
E
G
8
5
S
E
G
8
6
S
E
G
8
7
S
E
G
8
8
S
E
G
8
9
S
E
G
9
0
S
E
G
9
1
S
E
G
9
2
S
E
G
9
3
S
E
G
9
4
S
E
G
9
5
S
E
G
9
6
S
E
G
9
7
S
E
G
9
8
S
E
G
9
9
S
E
G
1
0
0
S
E
G
1
0
1
S
E
G
1
0
2
S
E
G
1
0
3
S
E
G
1
0
4
S
E
G
1
0
5
S
E
G
1
0
6
S
E
G
1
0
7
S
E
G
1
0
8
S
E
G
1
0
9
S
E
G
1
1
0
S
E
G
1
1
1
S
E
G
1
1
2
S
E
G
1
1
3
S
E
G
1
1
4
S
E
G
1
1
5
S
E
G
1
1
6
S
E
G
1
1
7
S
E
G
1
1
8
S
E
G
1
1
9
S
E
G
1
2
0
S
E
G
1
2
1
S
E
G
1
2
2
S
E
G
1
2
3
S
E
G
1
2
4
S
E
G
1
2
5
S
E
G
1
2
6
S
E
G
1
2
7
C
O
M
3
1
C
O
M
3
0
C
O
M
2
9
C
O
M
2
8
C
O
M
2
7
C
O
M
2
6
C
O
M
2
5
C
O
M
2
4
C
O
M
2
3
Pad Assignment
Chip size: 4950
5750 (mm)
2
* The IC substrate should be connected to VSS in the PCB layout artwork.
Pad Coordinates
Unit:
mm
Pad No.
X
Y
Pad No.
X
Y
Pad No.
X
Y
1
-2343.20
2715.30
62
-848.60
-2594.80
123
2343.05
1090.25
2
-2343.20
2581.20
63
-713.20
-2594.80
124
2343.05
1190.25
3
-2343.20
2461.20
64
-567.90
-2594.80
125
2343.05
1290.25
4
-2343.20
2341.20
65
-432.30
-2594.80
126
2343.05
1390.25
5
-2343.20
2221.20
66
-290.20
-2594.90
127
2343.05
1490.25
6
-2343.20
2101.20
67
-156.70
-2599.30
128
2343.05
1590.25
7
-2343.20
1990.25
68
-18.50
-2599.30
129
2343.05
1690.25
8
-2343.20
1890.25
69
119.80
-2666.95
130
2343.05
1790.25
9
-2343.20
1790.25
70
209.15
-2531.95
131
2343.05
1890.25
HT1670
Rev. 1.10
3
September 17, 2004
( 0 , 0 )
1
2
3
4
5
6
7
8
9
1 0
1 1
1 2
1 3
1 4
1 5
1 6
1 7
1 8
1 9
2 0
2 1
2 2
2 3
2 4
2 5
2 6
2 7
2 8
2 9
3 0
3 1
3 2
3 3
3 4
3 5
3 6
3 7
3 8
3 9
4 0
4 1
4 2
4 3
4 4
4 5
4 6
4 7
4 8
4 9
5 0
5 1
5 2
5 3
5 4 5 5 5 6 5 7 5 8
5 9 6 0
6 1 6 2 6 3 6 4 6 5 6 6 6 7 6 8
6 9
7 0
7 1 7 2 7 3 7 4 7 5 7 6 7 7 7 8 7 9
8 0 8 1 8 2 8 3 8 4 8 5
1 3 8
1 3 7
1 3 6
1 3 5
1 3 4
1 3 3
1 3 2
1 3 1
1 3 0
1 2 9
1 2 8
1 2 7
1 2 6
1 2 5
1 2 4
1 2 3
1 2 2
1 2 1
1 2 0
1 1 9
1 1 8
1 1 7
1 1 6
1 1 5
1 1 4
1 1 3
1 1 2
1 1 1
1 1 0
1 0 9
1 0 8
1 0 7
1 0 6
1 0 5
1 0 4
1 0 3
1 0 2
1 0 1
1 0 0
9 9
9 8
9 7
9 6
9 5
9 4
9 3
9 2
9 1
9 0
8 9
8 8
8 7
8 6
1 3 9
1 4 0
1 4 1
1 4 2
1 4 3
1 4 4
1 4 5
1 4 6
1 4 7
1 4 8
1 4 9
1 5 0
1 5 1
1 5 2
1 5 3
1 5 4
1 5 5
1 5 6
1 5 7
1 5 8
1 5 9
1 6 0
1 6 1
1 6 2
1 6 3
1 6 4
1 6 5
1 6 6
1 6 7
1 6 8
1 6 9
1 7 0
1 7 1
1 7 2
1 7 3
1 7 4
1 7 5
1 7 6
1 7 7
1 7 8
1 7 9
1 8 0
1 8 1
S E G 8 6
S E G 8 7
S E G 8 8
S E G 8 9
S E G 9 0
S E G 9 1
S E G 9 2
S E G 9 3
S E G 9 4
S E G 9 5
S E G 9 6
S E G 9 7
S E G 9 8
S E G 9 9
S E G 1 0 0
S E G 1 0 1
S E G 1 0 2
S E G 1 0 3
S E G 1 0 4
S E G 1 0 5
S E G 1 0 6
S E G 1 0 7
S E G 1 0 8
S E G 1 0 9
S E G 1 1 0
S E G 1 1 1
S E G 1 1 2
S E G 1 1 3
S E G 1 1 4
S E G 1 1 5
S E G 1 1 6
S E G 1 1 7
S E G 1 1 8
S E G 1 1 9
S E G 1 2 0
S E G 1 2 1
S E G 1 2 2
S E G 1 2 3
S E G 1 2 4
S E G 1 2 5
S E G 1 2 6
S E G 1 2 7
C O M 3 1
C O M 3 0
C O M 2 9
C O M 2 8
C O M 2 7
C O M 2 6
C O M 2 5
C O M 2 4
C O M 2 3
C O M 2 2
C O M 2 1
C
O
M
2
0
C
O
M
1
9
C
O
M
1
8
C
O
M
1
7
C
O
M
1
6
C
S
R
D
W
R
D
B
0
D
B
1
D
B
2
D
B
3
V
S
S
O
S
C
I
O
S
C
O
V
D
D
V
L
C
D
I
R
Q
B
Z
B
Z
T
1
T
2
T
3
T
4
T
0
0
0
V
L
C
D
C
O
M
0
C
O
M
1
C
O
M
2
C
O
M
3
C
O
M
4
C
O
M
5
C
O
M
6
S E G 4 2
S E G 4 1
S E G 4 0
S E G 3 9
S E G 3 8
S E G G 3 7
S E G 3 6
S E G 3 5
S E G 3 4
S E G 3 3
S E G 3 2
S E G 3 1
S E G 3 0
S E G 2 9
S E G 2 8
S E G 2 7
S E G 2 6
S E G 2 5
S E G 2 4
S E G 2 3
S E G 2 2
S E G 2 1
S E G 2 0
S E G 1 9
S E G 1 8
S E G 1 7
S E G 1 6
S E G 1 5
S E G 1 4
S E G 1 3
S E G 1 2
S E G 1 1
S E G 1 0
S E G 9
S E G 8
S E G 7
S E G 6
S E G 5
S E G 4
S E G 3
S E G 2
S E G 1
S E G 0
C O M 1 5
C O M 1 4
C O M 1 3
C O M 1 2
C O M 1 1
C O M 1 0
C O M 9
C O M 8
C O M 7
S
E
G
4
3
S
E
G
4
4
S
E
G
4
5
S
E
G
4
6
S
E
G
4
7
S
E
G
4
8
S
E
G
4
9
S
E
G
5
0
S
E
G
5
1
S
E
G
5
2
S
E
G
5
3
S
E
G
5
4
S
E
G
5
5
S
E
G
5
6
S
E
G
5
7
S
E
G
5
8
S
E
G
5
9
S
E
G
6
0
S
E
G
6
1
S
E
G
6
2
S
E
G
6
3
S
E
G
6
4
S
E
G
6
5
S
E
G
6
6
S
E
G
6
7
S
E
G
6
8
S
E
G
6
9
S
E
G
7
0
S
E
G
7
1
S
E
G
7
2
S
E
G
7
3
S
E
G
7
4
S
E
G
7
5
S
E
G
7
6
S
E
G
7
7
S
E
G
7
8
S
E
G
7
9
S
E
G
8
0
S
E
G
8
1
S
E
G
8
2
S
E
G
8
3
S
E
G
8
4
S
E
G
8
5
Pad No.
X
Y
Pad No.
X
Y
Pad No.
X
Y
10
-2343.20
1690.25
71
378.85
-2553.20
132
2343.05
1990.25
11
-2343.20
1590.25
72
525.35
-2594.90
133
2343.05
2101.20
12
-2343.20
1490.25
73
660.75
-2594.90
134
2343.05
2221.20
13
-2343.20
1390.25
74
820.45
-2594.90
135
2343.05
2341.20
14
-2343.20
1290.25
75
968.65
-2594.90
136
2343.05
2461.20
15
-2343.20
1190.25
76
1115.65
-2594.90
137
2343.05
2581.20
16
-2343.20
1090.25
77
1263.85
-2594.90
138
2343.05
2715.30
17
-2343.20
990.25
78
1410.85
-2594.90
139
2095.70
2715.30
18
-2343.20
890.25
79
1581.55
-2531.90
140
1959.25
2715.30
19
-2343.20
790.25
80
1707.05
-2702.70
141
1859.25
2715.30
20
-2343.20
690.25
81
1807.05
-2702.70
142
1759.25
2715.30
21
-2343.20
590.25
82
1907.05
-2702.70
143
1659.25
2715.30
22
-2343.20
490.25
83
2013.05
-2702.70
144
1559.25
2715.30
23
-2343.20
390.25
84
2123.05
-2702.70
145
1459.25
2715.30
24
-2343.20
290.25
85
2233.05
-2702.70
146
1359.25
2715.30
25
-2343.20
190.25
86
2343.05
-2702.70
147
1259.25
2715.30
26
-2343.20
90.25
87
2343.05
-2571.70
148
1159.25
2715.30
27
-2343.20
-9.75
88
2343.05
-2451.70
149
1059.25
2715.30
28
-2343.20
-109.75
89
2343.05
-2331.70
150
959.25
2715.30
29
-2343.20
-209.75
90
2343.05
-2215.05
151
859.25
2715.30
30
-2343.20
-309.75
91
2343.05
-2115.05
152
759.25
2715.30
31
-2343.20
-409.75
92
2343.05
-2015.05
153
659.25
2715.30
32
-2343.20
-509.75
93
2343.05
-1915.05
154
559.25
2715.30
33
-2343.20
-609.75
94
2343.05
-1815.05
155
459.25
2715.30
34
-2343.20
-709.75
95
2343.05
-1715.05
156
359.25
2715.30
35
-2343.20
-809.75
96
2343.05
-1609.75
157
259.25
2715.30
36
-2343.20
-909.75
97
2343.05
-1509.75
158
159.25
2715.30
37
-2343.20
-1009.75
98
2343.05
-1409.75
159
59.25
2715.30
38
-2343.20
-1109.75
99
2343.05
-1309.75
160
-40.75
2715.30
39
-2343.20
-1209.75
100
2343.05
-1209.75
161
-140.75
2715.30
40
-2343.20
-1309.75
101
2343.05
-1109.75
162
-240.75
2715.30
41
-2343.20
-1409.75
102
2343.05
-1009.75
163
-340.75
2715.30
42
-2343.20
-1509.75
103
2343.05
-909.75
164
-440.75
2715.30
43
-2343.20
-1609.75
104
2343.05
-809.75
165
-540.75
2715.30
44
-2343.20
-1709.75
105
2343.05
-709.75
166
-640.75
2715.30
45
-2343.20
-1809.75
106
2343.05
-609.75
167
-740.75
2715.30
46
-2343.20
-1909.75
107
2343.05
-509.75
168
-840.75
2715.30
47
-2343.20
-2009.75
108
2343.05
-409.75
169
-940.75
2715.30
48
-2343.20
-2109.75
109
2343.05
-309.75
170
-1040.75
2715.30
49
-2343.20
-2209.75
110
2343.05
-209.75
171
-1140.75
2715.30
50
-2343.20
-2309.75
111
2343.05
-109.75
172
-1240.75
2715.30
51
-2343.20
-2409.75
112
2343.05
-9.75
173
-1340.75
2715.30
52
-2343.20
-2509.75
113
2343.05
90.25
174
-1440.75
2715.30
53
-2343.20
-2609.75
114
2343.05
190.25
175
-1540.75
2715.30
54
-1850.15
-2702.70
115
2343.05
290.25
176
-1640.75
2715.30
55
-1750.15
-2702.70
116
2343.05
390.25
177
-1740.75
2715.30
56
-1650.15
-2702.70
117
2343.05
490.25
178
-1840.75
2715.30
57
-1550.15
-2702.70
118
2343.05
590.25
179
-1940.75
2715.30
58
-1450.15
-2702.70
119
2343.05
690.25
180
-2040.75
2715.30
59
-1273.50
-2594.80
120
2343.05
790.25
181
-2173.20
2715.30
60
-1130.90
-2594.80
121
2343.05
890.25
61
-995.50
-2594.80
122
2343.05
990.25
HT1670
Rev. 1.10
4
September 17, 2004
Pad Description
Pad No.
Pad Name
I/O
Description
1~42
96~181
SEG86~SEG127
SEG0~SEG85
O
LCD segment outputs
43~58
80~95
COM31~COM16
COM0~COM15
O
LCD common outputs, under 144
16 command mode, COM16~COM31 will
share to SEG128~SEG143. COM31/SEG128, COM30/SEG129, COM29/
SEG130....., COM18/SEG141, COM17/SEG142, COM16/SEG143
59
CS
I
Chip selection input with pull-high resistor. When the CS is logic high, the
data and command read from or write to the HT1670 are disabled. The serial
interface circuit is also reset. But if the CS is at a logic low level and is input to
the CS pad, the data and command transmission between the host controller
and the HT1670 are all enabled.
60
RD
I
READ clock input with pull-high resistor. Data in the RAM of the HT1670 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.
61
WR
I
WRITE clock input with pull-high resistor. Data on the DATA line are latched
into the HT1670 on the rising edge of the WR signal.
62~65
DB0~DB3
I/O
Parallel data input/output with a pull-high resistor
66
VSS
Negative power supply for logic circuit, ground
67
68
OSCI
OSCO
I
O
The OSCI and OSCO pads are connected to a 32.768kHz crystal in order to
generate a system clock. If the system clock comes from an external clock
source, the external clock source should be connected to the OSCI pad. But
if an on-chip RC oscillator is selected, the OSCI and OSCO pads can be left
open.
69
VDD
Positive power supply for logic circuit
70, 79
VLCD
I
Power supply for LCD driver circuit
71
IRQ
O
Time base or Watchdog Timer overflow flag, NMOS open drain output.
72, 73
BZ, BZ
O
2kHz or 4kHz frequency output pair (tristate output buffer)
74~78
T1~T4, T000
I
Vary bias current pin
It is usually not connected
Absolute Maximum Ratings
Supply Voltage ...........................V
SS
-0.3V to V
SS
+5.5V
Storage Temperature ............................
-50C to 125C
Input Voltage.............................V
SS
-0.3V to V
DD
+0.3V
Operating Temperature...........................
-25C to 75C
Note: These are stress ratings only. Stresses exceeding the range specified under
Absolute Maximum Ratings may
cause substantial damage to the device. Functional operation of this device at other conditions beyond those
listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliabil-
ity.
HT1670
Rev. 1.10
5
September 17, 2004
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