HT1621
Application Circuits
Host controller with an HT1621 display system
C
S
D
V
D
D
*
*
R
V
R
W
D
R
V
L
C
D
A
T
A
m
C
H
T
1
6
2
1
B
*
B
Z
R
P
i
e
z
o
I
R
Q
B
Z
O
O
S
S
C
C
I
O
C
l
o
c
k
O
u
t
C
O
M
0
~
C
O
M
3
S
E
G
0
~
S
E
G
3
1
E
E
x
x
t
t
e
e
r
r
n
n
a
a
l
l
C
C
o
o
l
l
c
c
k
k
1
2
1
/
2
o
r
1
/
3
B
i
a
s
;
1
/
2
,
1
/
3
o
r
1
/
4
D
u
O
n
-
c
h
i
p
O
S
C
L
C
D
P
a
n
e
l
C
r
y
s
t
a
l
3
2
7
6
8
H
z
Note:
The connection of IRQ and RD pin can be selected depending on the requirement of the mC.
The voltage applied to VLCD pin must be lower than VDD
.
Adjust VR to fit LCD display, at VDD=5V, VLCD=4V, VR=15kW±20%.
Adjust R (external pull-high resistance) to fit user s time base clock.
17
January 10, 2001
ETC [ ETC ]
