13. Dot Matrix LCD Controller (H8/3857 Group)
Rev.3.00 Jul. 19, 2007 page 372 of 532
REJ09B0397-0300
V2OUT
V3OUT
V4OUT
V
SS
V5OUT
Vci
V1OUT
V
LCD
V3
V34
V4
SEG1 to SEG40
COM32/SEG41
to COM9/SEG64
COM1 to COM8
C1+
Control
circuit
Step-up
circuit
PWR = 1
OPON = 0
V
SS
0.47 to 1
μ
F
1.
2.
3.
4.
5.
6.
7.
8.
Rt is a test resistance. The V3 and V34 pins should be shorted.
A value of around 5 k
Ω
to 25 k
Ω
is recommended for external power supply division resistance R.
For contrast control, either insert a variable resistance between V
LCD
and V1, or adjust step-up
circuit reference voltage Vci. The built-in contrast control circuit cannot be used.
The output voltage after step-up should not be lower than V
CC
and should not exceed 7.0 V.
With 3X step-up, in particular, do not input a voltage of 2.3 V or above as the reference voltage
(Vci).
Vci is also used for the step-up circuit power supply. Use a transistor, etc., for current amplification
to ensure an adequate LCD drive current.
The Vci input level must not exceed V
CC
.
Care is required with connection when using capacitors with polarity.
Set V1OUT
≤
V
LCD
.
Notes:
Vci
V1
V2
R
R
R
R
R
V3
Rt
V4
V5
V
SS
OFF
V
R
C1
–
C2+
C2
–
VLOUT
+
0.47 to 1
μ
F
+
0.47 to 1
μ
F
+
Figure 13.18 Example of Connections when Using 3X Step-Up Circuit and External Bleeder
Resistances (1/5 Bias)
Summary of Contents for F-ZTAT H8 Series
Page 6: ...Rev 3 00 Jul 19 2007 page iv of xxiv REJ09B0397 0300...
Page 194: ...7 RAM Rev 3 00 Jul 19 2007 page 168 of 532 REJ09B0397 0300...
Page 234: ...8 I O Ports Rev 3 00 Jul 19 2007 page 208 of 532 REJ09B0397 0300...
Page 274: ...9 Timers Rev 3 00 Jul 19 2007 page 248 of 532 REJ09B0397 0300...
Page 352: ...12 A D Converter Rev 3 00 Jul 19 2007 page 326 of 532 REJ09B0397 0300...
Page 561: ......
