HD66727 Datasheet, PDF (67/97 Pages) Hitachi Semiconductor – Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver with Key Scan Function

HD66727
HD66727
V_CC
V_CC
R
V2 ^R
R
+
–
V1
+
–
V2
V3 ^R
R
R
VR
V_EE
+
–
V3
+
–
V4
+
–
V5
CT
Figure 38 Contrast Adjuster
Table 30
CT3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Contrast-Adjust Bits (CT) and Variable Resistor Values
CT2
CT1
CT0
Variable Resistor Value (VR)
0
0
0
6.4 R
0
0
1
6.0 R
0
1
0
5.6 R
0
1
1
5.2 R
1
0
0
4.8 R
1
0
1
4.4 R
1
1
0
4.0 R
1
1
1
3.6 R
0
0
0
3.2 R
0
0
1
2.8 R
0
1
0
2.4 R
0
1
1
2.0 R
1
0
0
1.6 R
1
0
1
1.2 R
1
1
0
0.8 R
1
1
1
0.4 R
Static Drive System
Contrast for a statically-driven LCD, that is, annunciator display, can be adjusted through the AGND pin.
The annunciators are driven statically by the potential difference between V_CC and AGND. The AGND pin
level must be equal to or greater than the GND level.
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