Technical information

Low Power Mode
20 G30 - Module Hardware Description December 15, 2009
Temporary Termination of Low Power Mode
Temporary termination of low power mode occurs when G30 switches from Sleep mode to Idle
mode for a defined period, and then returns automatically to Sleep mode.
Low power mode may be terminated temporarily by several sources, some of which are user
initiated and others are initiated by the system.
Using the WKUPI signal
The WKUPI signal is an active low input, that is set high by default. By asserting this signal low
the application can wake-up G30 from low power mode and switch to Idle mode.
G30 will remain in Idle mode, awake and fully active, as long as WKUPI signal remains low.
When this signal is disabled and set high again, G30 will return to Sleep mode automatically,
according to the ATS24 settings (see Figure 2-8).
Figure 2-8: WKUPI Signal Operation
The WKUPI signal is the recommended method to temporarily wake-up G30 from low power
mode. It provides the application full control of the G30 operating mode and guarantees that data
on the serial interface will not be lost or misinterpreted.
The WKUPI signal must be used to wake up G30 from low power mode if the serial interface has
been disabled by the AT+MSCTS command.
Incoming Network Data
During low power mode, G30 continues monitoring the GSM network for any incoming data,
message or voice calls.
When G30 receives an indication from the network that an incoming voice call, message or data
is available, it automatically wakes up from low power mode to alert the application. When G30
has completed to process all the tasks related to the incoming data, it will automatically return to
low power mode according to the ATS24 settings.
Depending on the type of network indication and the application settings, G30 may operate in
several methods, which are configurable by AT commands, to alert the application of the
incoming data:
• Enable the WKUPO signal to wake-up the application from low power.
• Send data to the application over the serial interface.
• Enable the serial interface's Ring Indicator (RI) signal.