RA8806
Preliminary Version 1.0
Two Layers Character/Graphic LCD Controller
4-4 LCD Driver Interface
Pin Name
YD
I/O
Description
Start Signal of LCD Per Frame
YD is the reset pulse for the COM driver, it’s active during the last COM
period of each frame and latched by LP signal.
O
LCD AC Wave Output
This signal controls the Level Shift of LCD driver. Normally it works as
VDD/GND interlacing to prevent the liquid cystal polarization.
LCD Common Latch
LP is the latch pulse for the shift register of SEG driver to SEG output. It is
also used as COM driver shift clock.
O
O
FR
LP
LCD Clock
XCK is the latch pulse of the LCD driver data(LD[7:0]) for SEG driver. The
falling edge of XCK will latch the LD[7:0] (or LD[3:0] for 4-bits driver) to the
shift register.
LCD Display Off
This signal is used to control the LCD Display On or Off.
O
O
XCK
ZDOFF
0 : Display off.
1 : Display on.
LCD Driver Data Bus
When 8-bits LCD driver IC is used. LD[7:0] are connected to LCD driver
data bus. When 4-bits driver is used, LD[3:0] are connected to LCD driver
data bus and LD[7:4] keep floating.
O
LD[7:0]
RA8806T1N supports LD[3:0] only.
4-5 Power
Pin Name
VDDH
I/O
Description
5V Power
This is the source power for DC to DC converter. In 5V power application,
it is connected to 5V. If 3V application is used, then keep this pin floating.
P
3V Power
If the pin VDDH connects to 5V power then the pin will driving 3V power,
and must add an external 1uF capacitor to GND. If 3V application is used,
then connecting this pin to external 3V power directly.
P
VDD
Power for I/O Buffer
VDDP can be 3V or 5V.
Analog Power for ADC Touch Panel Controller
AVDD can be 3V or 5V.
P
P
VDDP
AVDD
GND
Ground
P
P
GNDP
Analog Ground for ADC Touch Panel Controller
Connect this pin to 0V earth ground(GND).
AGND
Test Mode
This pin is used for test only. It has internal pull-low and need to keep
floating.
Test Pin
The pin is used for test function, It has internal pull-low and need to keep
floating.
I
I
TESTMD
TESTI
RAiO TECHNOLOGY INC.
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RAIO [ RAIO TECHNOLOGY INC. ]
