HD66740 Datasheet, PDF (20/95 Pages) Hitachi Semiconductor – 112 x 80-dot Graphics LCD Controller/Driver

HD66740
Table 6 CT Bits and Variable Resistor Value of Contrast Adjuster
CT Set Value
CT5
CT4
CT3
CT2
CT1
CT0
Variable Resistor (VR)
0
0
0
0
0
0
3.20 x R
0
0
0
0
0
1
3.15 x R
0
0
0
0
1
0
3.10 x R
0
0
0
0
1
1
3.05 x R
0
0
0
1
0
0
3.00 x R
•
•
•
•
0
1
1
1
1
1
1.65 x R
1
0
0
0
0
0
1.60 x R
1
0
0
0
0
1
1.55 x R
1
0
0
0
1
0
1.50 x R
•
•
•
•
1
1
1
1
0
1
0.15 x R
1
1
1
1
1
0
0.10 x R
1
1
1
1
1
1
0.05 x R
BT1-0: When SW = 1, they switch the output of V5OUT between triple, quadruple, and five-times boost.
The liquid crystal display drive voltage level can be selected according to its drive duty ratio and bias.
A lower amplification of the booster consumes less current.
BS2-0: When SW = 1, they set the crystal display drive bias value within the range of 1/4 to 1/10 bias.
The liquid crystal display drive bias value can be selected according to its drive duty ratio and voltage.
For details, see the Liquid Crystal Display Drive Bias Selector section.
Table 7 BT Bits and Output Level
BT1
BT0
V5OUT Output Level
0
0
Triple boost
0
1
Quadruple boost
1
0
Five-times boost
1
1
Setting inhibited
20