ST7565S
(3) When the V/F circuit alone is used
(4) When the built-in power is not used
DD
V
V
DD
V
SS
IRS
M/S
IRS
M/S
V
V
SS2
V
V
SS2
V
SS
OUT
OUT
CAP3-
CAP1+
CAP1-
CAP2+
CAP2-
CAP4-
CAP5-
CAP3-
CAP1+
CAP1-
CAP2+
CAP2-
CAP4-
CAP5-
External
power
supply
V
V
5
V
V
5
R
R
V
DD
VDD
V
DD
V
DD
C2
C2
C2
C2
C2
V1
V2
V3
V4
V5
V1
V2
V3
V4
V5
External power supply
Note:
Item
Set value
Units
C1
C2
1.0 ~ 4.7
0.1 ~ 4.7
uF
uF
* C1 and C2 are determined by the size of the LCD being driven
Note:
1. Because the VR terminal input impedance is high, use short leads and shielded lines.
2. C1 and C2 are determined by the size of the LCD being driven. Select a value that will stabilize the liquid crystal drive
voltage.
Example of the Process by which to Determine the Settings:
ꢀ
ꢀ
Turn the voltage regulator circuit and voltage follower circuit ON and supply a voltage to VOUT from the outside.
Determine C2 by displaying an LCD pattern with a heavy load (such as horizontal stripes) and selecting a C2 that
stabilizes the liquid crystal drive voltages (V1 to V5). Note that all C2 capacitors must have the same capacitance value.
Next turn all the power supplies ON and determine C1.
ꢀ
Ver 0.6c
40/72
2009/09/07
SITRONIX [ SITRONIX TECHNOLOGY CO., LTD. ]
