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ST7568 Datasheet(PDF) 43 Page - Sitronix Technology Co., Ltd.

Part # ST7568
Description  68 x 102 Dot Matrix LCD Controller/Driver
PDF  73 Pages
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Manufacturer  SITRONIX [Sitronix Technology Co., Ltd.]
Direct Link  http://www.sitronix.com.tw
Logo SITRONIX - Sitronix Technology Co., Ltd.

ST7568 Datasheet(HTML) 43 Page - Sitronix Technology Co., Ltd.

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ST7568
Ver 2.2
43/73
2008/01/04
GD3=WD3, LD3, DD3, BD3 GA2=WD2, LD2, DD2, BD2 GA1=WD1, LD1, DD1, BD1 GA0=WD0, LD0, DD0, BD0
LCD bias voltage
Symbol
Bias voltage for 1/8 bias
Symbol
Bias voltage for 1/8 bias
VLCDIN
VLCDIN
V3
2/8 X VLCDIN
V1
7/8 X VLCDIN
V4
1/8 X VLCDIN
V2
6/8 X VLCDIN
VSS
VSS
Set VOP value:
The operation voltage VLCD can be set by software.
V0=( a + VOP×b )
(1)
The parameters are explained in table 4.The maximum voltage that can be generated is depending on the VDD voltage
and the display load current. Two overlapping VLCD ranges are selectable via the command “Booster control”. For the
LOW (PS=0) range a=a1 and for the HIGH (PRS=1) range a=a2 with steps equal to “b” in both ranges. Note that the
charge pump is turned off if VOP [6;0] and the bit PRS are all set to zero.
The V0 Temperature Gradient is -0.05%/
oC
Table 4 Typical values for parameter for the HV-Generator programming
SYMBOL
VALUE
UNIT
a1
2.94(PRS=0)
V
a2
6.75(PRS=1)
V
b
0.03
V
00
01
02
03
04
05
06
.....
7E
7F
00
7D
01
02
03
04
05
06
.....
7E
7D
7F
a1+b
b
a2
VL2
LOW(PRS=0)
HIGH(PRS=1)
VOP [6:0](programmed) {00 hex
… 7F hex}
Fig.21 VOP programming of ST7568



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