S6B0755 Datasheet, PDF (31/68 Pages) Samsung semiconductor – 128 SEG / 65 COM DRIVER & CONTROLLER FOR STN LCD

128 SEG / 65 COM DRIVER & CONTROLLER FOR STN LCD
PRELIMINARY SPEC. VER. 1.0
S6B0755
In Case of Using Internal Resistors, Ra and Rb (INTRS = "H”)
When INTRS pin is "H", resistor Ra is connected internally between VR pin and VSS, and Rb is connected
between V0 and VR. We determine V0 by two instructions, "Regulator Resistor Select" and "Set Reference
Voltage".
1 + (Rb / Ra)
Table 11. Internal Rb / Ra Ratio depending on 3-bit Data (R2 R1 R0)
3-bit data settings (R2 R1 R0)
000
001
010
011
100
101
110
2.3
3.0
3.7
4.4
5.1
5.8
6.5
111
7.2
Figure 21 Shows V0 voltage measured by adjusting internal regulator register ratio (Rb / Ra) and 6-bit electronic
volume registers for each temperature coefficient at Ta = 25 °C.
16.00
14.00
12.00
10.00
8.00
6.00
4.00
2.00
0.00
0
(1, 1, 1)
(1, 1, 0)
(1, 0, 1)
(1, 0 ,0)
(0, 1, 1)
(0, 1, 0)
(0, 0, 1)
(0, 0, 0)
8
16
24
32
40
48
56
63
Electronic volume register (0 to 63)
63
Figure 21. Electronic Volume Level (Temp. Coefficient = -0.05% / °C)
28