ST7567 View Datasheet(PDF) - Unspecified
Part Name
Description
MFG CO.
'ST7567' PDF : 73 Pages View PDF
ST7565S
VDD
VSS
VDD
External
power
supply
C2
C2
C2
C2
C2
IRS
VSS2
VOUT
CAP3-
CAP1+
CAP1-
CAP2+
CAP2-
V5
VR
VDD
V1
V2
V3
V4
V5
M/S
CAP4-
CAP5-
VSS
IRS
VDD
External power supply
VSS2
VOUT
CAP3-
CAP1+
CAP1-
CAP2+
CAP2-
V5
VR
VDD
V1
V2
V3
V4
V5
VDD
M/S
CAP4-
CAP5-
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 V1, V2, V3 and V4 which are output from the
VDD,V0
R4
R4
C2
V1
V2
V3
V4
built-in voltage follower.
Examples of shared reference settings When V5 can vary
between –8 and 12 V
Item Set value units
c1
1.0 to 4.7
uF
c2
0.1 to 4.7
uF
C1 and C2 are determined by the size of
the LCD being driven
R4
R4
V5
Reference set value R4: 100KΩ ~ 1MΩ It is recommended crystal display and the drive waveform.
to set an optimum resistance value R4 taking the liquid
Figure 15
* 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 0.3c
40/72
2002/07/22
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