S6A0092 Datasheet, PDF (40/54 Pages) Samsung semiconductor – 80 SEG / 26 COM DRIVER & CONTROLLER FOR STN LCD

S6A0092
26 COM / 80 SEG DRIVER & CONTROLLER FOR STN LCD
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 = "Low"
V0 = ( 1 +
Rb
) x VEV --- (3)
Ra
VEV = VREF - nα (n = 0, 1, 2, ..., 30, 31)
α = VREF / 150
When REF = "High"
Rb
V0 = ( 1 +
Ra
) x VEV --- (4)
VEV = VEXT - nα (n = 0, 1, 2, ..., 30, 31)
α = VEXT / 150
Table 15. Electronic Contrast Control Register
No. C7 C6 C5 C4 C3 C2 C1 C0
1
- - - 00000
2
- - - 00001
3
- - - 00010
4
- - - 00011
.
........
.
........
.
........
31 - - - 1 1 1 1 0
32 - - - 1 1 1 1 1
nα
0α (default)
1α
2α
3α
.
.
.
30 α
31α
V0
Maximum
.
.
.
.
.
.
.
Minimum
Contrast
High
.
.
.
.
.
.
.
Low
("-" Don`t care )
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