GSM/GPRS Module
M85 Hardware Design
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EMERG_OFF
(INPUT)
STATUS
(OUTPUT)
Delay >2s
6us
Pulldown
>20ms
PWRKEY
(INPUT)
Figure 13: Timing of Restarting System after Emergency Shutdown
3.5. Power Saving
Based on system requirements, there are several actions to drive the module to enter low current
consumption status. For example, ―AT+CFUN‖ can be used to set module into minimum functionality
mode and DTR hardware interface signal can be used to lead system to SLEEP mode.
3.5.1. Minimum Functionality Mode
Minimum functionality mode reduces the functionality of the module to a minimum level. The consumption
of the current can be minimized when the slow clocking mode is activated at the same time. The mode is
set with the ―AT+CFUN‖ command which provides the choice of the functionality levels <fun>=0, 1, 4.
0: minimum functionality
1: full functionality (default)
4: disable both transmitting and receiving of RF part
If the module is set to minimum functionality by ―AT+CFUN=0‖, the RF function and SIM card function
would be disabled. In this case, the UART port is still accessible, but all AT commands related with RF
function or SIM card function will be not available..
If the module has been set by the command with ―AT+CFUN=4‖, the RF function will be disabled, but the
UART port is still active. In this case, all AT commands related with RF function will be not available.
After the module is set by ―AT+CFUN=0‖ or ―AT+CFUN=4‖, it can return to full functionality by
―AT+CFUN=1‖.
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