R
Hardware Schematic Diagram
The voltage and contrast settings must be configured before the LCD panel is ready for
operation. Figure C-6 shows the initialization procedure required to set up the LCD
controller.
Setup Instruction Flow
Power ON
Board Power Supply Start
RESETB Pin is Kept LOW
Start FPGA Configuration
RESETB Pin is Kept LOW
FPGA Configured and Application Running
RESETB Pin is Taken HIGH
ADC Select
- ADC = 0 SEG1 --> SEG132
- ADC = 1 SEG132 --> SEG1
SHL Select
- SHL = 0 COM1 --> COM64
- SHL = 1 COM64 --> COM1
ADC Select
SHL Select
LCD Bias Select
Voltage Converter ON
Voltage Regulator ON
Voltage Follower ON
Regulator Resistor Select
Set Reference Voltage
End Initialization
LCD Bias
DUTY0, 1 is "11".
LCD Bias 0 = 1/7
LCD Bias 1 = 1/9
Wait between each instruction longer
than 1 ms to let the voltages stabilize.
The on-chip resistors are used.
Therefore, the selection MUST be
set to 101.
Setting Reference Voltage
is a two-pass instruction:
- Set Reference Voltage Mode
- Set Reference Voltage Register
UG202_C_06_050906
Figure C-6:
LCD Controller Initialization Flow
Operation Example of the 64128EFCBC-3LP
The KS0713 LCD controller has several default settings of operation on the LCD panel
display PCB. Some settings are forced through direct bonding on the chip. The default
settings are:
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?
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Master mode
Parallel mode
Internal oscillator
Duty cycle ratio is set to 1/65
Voltage converter input is between 2.4V ≤ VDD ≤ 3.6V, where VDD connects to 3.3V
Internal voltage divider resistors
Temperature coefficient is set to -0.05%/ ° C
ML550 Networking Interfaces Platform
UG202 (v1.4) April 18, 2008
73
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