User Manual

G610 GPRS Module Hardware User Manual Page 16 of 47
1 TX slot 1 Rx slot 19 300
DCS/PCS PCL=0 1400
15 300
I gprs-avg
Average current
GPRS Class 10
2 TX slot 2 Rx slot
GSM850/900
PCL=5 420
mA
19 150
DCS/PCS PCL=0 380
15 150
3.4 Power On/Off Operation
The G610 power on and off is the two primary phases, which are related at the interface
connector by the hardware signals POWER_ON, VDD.
The POWER_ON signal is main controller.
The VDD signal indicates whether G610 is powered on or off. When this signal is disable (0V),
G610 is powered-off. When it is output (2.85V), G610 is powered-on.
Important: When the VBAT power supplied, the G610 module will be turn on automatically.
Important: The VDD would be flowed backwards by other IOs which be connected extend
voltage. So DSR/CTS/LPG can be indicated the powered on process replaced.
Important: The TXD should be pulled up continuously between the G610 turn on process.
G610 Pin# G610 Signal name Description
10 POWER_ON
Power on and off module
Low level activated
9 VDD
Illustrating module start up
LDO power output 0V : G610 is power off
LDO power output 2.85V : G610 is start up
3.4.1 Turning the G610 On
When the G610 is powered off, the PMU operates at low power mode, with only the RTC timer
active. G610 will power on again when the POWER_ON signal is falling edge. Asserting the
POWER_ON signal low for a minimum of 800 milliseconds will turn G610 on.