ra8816 RAIO Technology Inc., ra8816 Datasheet - Page 43

• Manufacturer Part Number: ra8816
• Description: 144x65 Character/graphic Lcd Driver
• Manufacturer: RAIO Technology Inc.

Preliminary Version 1.6
RAiO TECHNOLOGY INC.
6-10 Power Control
The RA8816 supports Normal Mode and Sleep Mode for operation. If write “0” to bit0 of register PWRR,
then RA8816 will enter sleep mode. The functions of LCD display and driver will stop. All of the signals
of COM and SEG will keep low, Key Strobe signals will keep high, and I/O keep the original state.
Because the RC clock was stop, so the power consumption is very low.
The RA8816 provide three way to wake up the system:
In wake up phase, the RA8816 will wake up the RC oscillator first, and it will take around 250ms. Then
the RA8816 is enable to accept the command from MPU and LCD driver wake up for activity.
The VDD power operation range of RA8816 is 2.5~3.6V. But on the COG module, some power
consumption will lose on the connection of FPC and chip that due to the ITO layout issue. So normally
the VDD power range of COG module on the FPC side is around V2.7~3.8V.
1. Write ”1” to the bit0 of register PWRR.
2. Key-scan to wake up
3. I/O wake up
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144x65 Character/Graphic LCD Driver
www.raio.com.tw
RA8816