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3.9 Supplying LCD Drive Voltages V
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
LCD Drive Voltage Pin
V
LC0
V
LC1
V
LC2
Note For the 1/2 bias method, it is necessary to connect the V
Figure 3-25 shows examples of generating LCD drive voltages internally according to Table 3-10.
46
CHAPTER 3 LCD CONTROLLER/DRIVER
, V
, and V
LC0
LC1
LC2
No Bias (Static)
V
LCD
2
V
LCD
3
1
V
LCD
3
User's Manual U18438EJ2V0UD
1/2 Bias Method
V
LCD
1
Note
V
LCD
2
and V
pins externally.
LC1
LC2
1/3 Bias Method
V
LCD
2
V
LCD
3
1
V
LCD
3
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