ST7533 Sitronix Technology, ST7533 Datasheet - Page 29
![no-image](/images/no-image-200.jpg)
ST7533
Manufacturer Part Number
ST7533
Description
33 x 96 Dot Matrix LCD Controller/Driver
Manufacturer
Sitronix Technology
Datasheet
1.ST7533.pdf
(60 pages)
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ST7533
3. When the V/F circuit alone is used
5. When the built-in power circuit is used to drive a liquid
crystal panel heavily loaded with AC or DC, it is
recommended to connect an external resistor to stabilize
potentials of V
Reference set value R4: 100KΩ ~ 1MΩ It is recommended
to set an optimum resistance value R4 taking the liquid
* 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
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
• Next turn all the power supplies ON and determine C1.
Ver 1.0
liquid crystal drive voltages (V
C2
voltage.
R4
1
, V
V
V
V
R4
DD
DD
SS
2
, V
R4
3
R4
and V
External
power
supply
V
V1
V2
V3
V4
V5
DD,
4
C2
C2
C2
C2
C2
1
V
which are output from the
0
to V
5
). Note that all C2 capacitors must have the same capacitance value.
V
V
CAP3-
CAP1+
CAP1-
CAP2+
CAP2-
V
V
V
V1
V2
V3
V4
V5
SS2
OUT
5
R
DD
IRS
M/S
Figure 15
CAP4-
CAP5-
29/60
4. When the built-in power is not used
built-in voltage follower.
Examples of shared reference settings When V
between –8 and 12 V
crystal display and the drive waveform.
V
DD
External power supply
C1 and C2 are determined by the size of
the LCD being driven
Item
c1
c2
V
Set value
1.0 to 4.7
0.1 to 4.7
SS
V
V
CAP3-
CAP1+
CAP1-
CAP2+
CAP2-
V
V
V
V1
V2
V3
V4
V5
SS2
OUT
5
R
DD
IRS
units
uF
uF
M/S
V
DD
CAP4-
CAP5-
2003/07/21
5
can vary
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