CHAPTER 3 LCD CONTROLLER/DRIVER
User’s Manual U18438EJ2V0UD
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3.9 Supplying LCD Drive Voltages V
LC0
, V
LC1
, and V
LC2
A LCD drive power supply can be generated using either of three types of methods: internal resistance division
method, external resistance division method, or internal voltage boosting method.
3.9.1 Internal resistance division method
Voltage divider resistors for generating LCD drive power supplies are incorporated. Using internal voltage divider
resistors, a LCD drive power supply that meet each bias method listed in Table 3-10 can be generated, without using
external voltage divider resistors.
Table 3-10. LCD Drive Voltages (with On-Chip Voltage Divider Resistors)
Bias Method
No Bias (Static)
1/2 Bias Method
1/3 Bias Method
LCD Drive Voltage Pin
V
LC0
V
LCD
V
LCD
V
LCD
V
LC1
V
LCD
V
LCD
Note
V
LCD
V
LC2
V
LCD
V
LCD
Note
For the 1/2 bias method, it is necessary to connect the V
LC1
and V
LC2
pins externally.
Figure 3-25 shows examples of generating LCD drive voltages internally according to Table 3-10.
2
3
2
3
1
2
1
3
1
3