External Divider Resistors For Lcd Controller - Fujitsu F2MC-8FX Hardware Manual

24.2.2

External Divider Resistors for LCD Controller

Models allow external divider resistors to be connected to the V1 to V3 pins.
Also, the brightness can be adjusted by connecting a variable resistor between the V
and V3 pins.
External Divider Resistors
If not using the internal divider resistors , you can connect external divider resistors to the LCD
drive power supply pins (V1 to V3) instead. Figure 24.2-5 shows an example of connecting
external divider resistors and Table 24.2-1 lists the LCD drive voltage settings for the bias
method.
Figure 24.2-5 Example of Connecting External Divider Resistors
Table 24.2-1 LCD Driving Voltage Settings
V1 to V3: Voltages at V1 to V3 pins
VLCD: LCD operating voltage
Vcc
V3
V2
V1
1/2 bias
V3
1/2 bias VLCD
1/3 bias VLCD
R
VLCD
R
1/3 bias
V2
1/2 VLCD
2/3 VLCD
CHAPTER 24 LCD CONTROLLER
Vcc
VR
V3
R
V2
VLCD
R
V1
R
V1
1/2 VLCD
1/3 VLCD
CC
437