ra8803 RAIO Technology Inc., ra8803 Datasheet - Page 32

• Manufacturer Part Number: ra8803
• Description: Two Layers Character/graphic Lcd Controller Specification
• Manufacturer: RAIO Technology Inc.

Version 2.5
RAiO
6-12 Power
TECHNOLOGY INC.
The RA8803/8822 also provides a Busy signal. When BUSY Flag is “1”, which means RA8803/8822 is
in busy status that RA8803/8822 couldn’t access data of DDRAM but still accept the commands from
registers. If BUSY is ‘0’, which means RA8803/8822 is in idle state.
Normally, this BUSY pin is connected to MPU I/O input, and then MPU have to monitor this pin before
accessing RA8803/8822.
6-12-1 Power Architecture
6-12-2 Power Saving Mode
The power architecture of RA8803/8822 is show as Figure 6-7. The I/O power is VDDP and GNDP.
The analog power for internal ADC are AVDD and AGND. The RA8803/8822 built-in a 5V to 3V
DC/DC Converter. The input power of this Converter is VDD5, and VDD3 is the output. VDD3
supply the power of internal core and DAC. If the system uses 3V only, then connect the 3V power
to VDDP, VDD3 and AVDD directly. Please refer t to AP note Appendix B-2.
The RA8803/8822 provide two operation modes: Normal Mode and Off Mode. Please refer to
Chapter 5-2 for Register WLCR explanation. When RA8803/8822 is under Off Mode, it can accept
the following three methods to Wake-up.
1. Directly Command REG[00h], then it will return to Normal Mode
2. Touch event is detected
3. Key Scan is detected
VDDP
VDD3
VDD5
AVDD
Figure 6-7: Power Architecture
RA8803/8822
5V
Core
ADC
32/48
3V
Two Layers Character/Graphical LCD Controller
DAC
GNDP
GND
AGND
RA8803/8822
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