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ST7093 Datasheet(PDF) 30 Page - Sitronix Technology Co., Ltd.

Part # ST7093
Description  26 COM / 80 SEG LCD CONTROLLER/DRIVER
PDF  43 Pages
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Manufacturer  SITRONIX [Sitronix Technology Co., Ltd.]
Direct Link  http://www.sitronix.com.tw
Logo SITRONIX - Sitronix Technology Co., Ltd.

ST7093 Datasheet(HTML) 30 Page - Sitronix Technology Co., Ltd.

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ST7093
Ver 2.1
30/43
2003/09/23
Electronic contrast control (32 steps)
Electronic contrast control data bits is 10H = (C4, C3, C2, C1, C0 ), Voltage regulation is adjusted as 32-contrast
step According to the value of Electronic contrast control data bits. LCD drive voltage V0 has one of 32 voltage
values if 5-bit data is set to the electronic contrast control register (ICONRAM address 10H). When using the
electronic contrast control function, you need to turn the voltage regulators on using power control instruction.
When REF is “Low”
V0 = ( 1 + Rb / Ra ) x Ven ….. (3)
Ven = Vref - nα
( n = 0, 1, 2, ….. 30, 31 )
α = Vref / 150
When REF is “High”
V0 = ( 1 + Rb / Ra ) x Ven ….. (4)
Ven = Vext - nα
( n = 0, 1, 2, ….. 30, 31 )
α = Vext / 150
No. C7 C6 C5 C4 C3 C2 C1 C0
n
V0
Contrast
1
-
-
- 0
0
0
0 0
0 (default)
Maximum
High
2
-
-
-
0
0
0
0
1
1
.
.
3
-
-
-
0
0
0
1
0
2
.
.
4
-
-
-
0
0
0
1
1
3
.
.
.
.
.
.
.
.
.
.
.
.
.
.
31
-
-
-
1
1
1
1
0
30
.
.
32
-
-
- 1
1
1
1
1
31
Minimum
Low
Electronic contrast control register
(“-“ don’t care)
+
-
REF
Vo
Vout
VR
VEXT
Vss
Vref
Inside Chip
Ra
GND
Rb
+
Ven
-
-
+
Electronic contrast control circuit



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