Low Power Mode; Activating Low Power Mode - Motorola G24 Developer's Manual

Low Power Mode

The G24 incorporates an optional low power mode, called Sleep Mode, in which it operates in
minimum functionality, and therefore draws significantly less current. During low power mode
the G24 network connection is not lost. G24 continues to monitor the GSM network constantly
for any incoming calls or data.
During low power mode, all of the G24 interface signals are inactive and are kept in their
previous state, prior to activating low power mode. To save power, all the G24 internal clocks and
circuits are shut down, and therefore serial communications is limited.
Important:
Important:

Activating Low Power Mode

By default, the G24 powers on in Idle mode. In this mode the G24 interfaces and features are
functional and the module is fully active.
Low power mode is activated by the ATS24 command. The value set by this command
determines the delay duration, in seconds, that will take the G24 to enter sleep mode.
For example:
ATS24 = 1 activates low power mode within 1 second.
ATS24 = 5 activates low power mode within 5 seconds.
ATS24 = 0 disables low power mode (default).
Figure 2-8
Figure 2-8: ATS24 Operation
January 1, 2006
G24 will not enter low power mode in any case when there is data present on the
serial interface or incoming from the GSM network or an internal system task is
running. Only when processing of any external or internal system task has
completed, G24 will enter low power mode according to the ATS24 command
settings.
G24 will not enter low power mode when USB is operating. Connecting USB to the
G24 will disable the low power mode operation.
illustrates the ATS24 command operation.
Module Hardware Description
Chapter 2: Hardware Interface Description
19