M10 Hardware Design
PWRKEY
（INPUT）
Pulldown >20ms
Delay>2s
EMERG_OFF
（INPUT）
Figure 12 : Timing of restart system after emergency shutdown
3.5 Power saving
There are two methods for the module to enter into low current consumption status. “AT+CFUN”
is used to set module into minimum functionality mode and DTR hardware interface signal can be
used to lead system to be SLEEP mode (or slow clocking mode).
3.5.1 Minimum functionality mode
Minimum functionality
mode reduces the functionality of the module to a minimum and, thus,
minimizes the current consumption to the lowest level. This mode is set with the “AT+CFUN”
command which provides the choice of the functionality levels <fun>=0，
1，4.
z 0: minimum functionality;
z 1: full functionality (default);
z 4: disable phone both transmitting and receive RF circuits;
If the module has been set to minimum functionality by “AT+CFUN=0”, the RF function and SIM
card function will be closed. In this case, the serial port is still accessible, but all AT commands
correlative with RF function or SIM card function will not be accessible.
If the module has been set by “AT+CFUN=4”, the RF function will be closed, the serial port is
still active. In this case, all AT commands correlative with RF function will not be accessible.
After the module has been set by “AT+CFUN=0” or “AT+CFUN=4”, it can return to full
functionality by “AT+CFUN=1”.
For detailed information about “AT+CFUN”, please refer to document [1].
M10_HD_V1.00 - 30 -
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