User's Manual

A8000 User Guide
Confidential
A8000_User_Guide_V1.0 Page 8 of 22 2009/05/13
RESET_N 42 I
A8000 system reset Logic LOW effective
GND 1,2,4,5,20
,21,49,59,
60
- Ground
-
2.1.2 Turn On / Off A8000
2.1.2.1 Turn On A8000
To turn on A8000, the following procedures may be used:
• As default settings, A8000 will be turning on automatically when detecting voltage applied on
VBAT pad over 3.5V;
• If ON/OFF key function needed, the signal SWITCH_ON could be defined as power key to turn
on the system by pulling it up to VDD_LRTC.
2.1.2.2 Turn Off A8000
To turn off A8000, the following procedures may be used:
• As default settings, A8000 will be turning off automatically when detecting voltage applied on
VBAT pad below 3.3V;
• If ON/OFF key function needed, the signal SWITCH_ON could be defined as power key to turn
off the system by pulling it up to VDD_LRTC.
2.1.3 Power Saving
SLEEP mode can shut down unnecessary functions of the A8000 module to minimizes the power
consumption to the lowest level.
2.1.3.1 Sleep Mode
When no on air or audio activity required and no any hardware interrupt (such as GPIO interrupt or
data on serial port), A8000 will enter SLEEP mode automatically after 5 seconds, which can shut
down unnecessary functions of the A8000 module to minimizes the power consumption. In sleep
mode, A8000 can still receive paging or SMS from network and the serial will not be accessible
until A8000 be waked up.
2.1.3.2 Wake Up A8000 From SLEEP Mode
When A8000 is SLEEP mode, the following method can wake up the module.