Low Power Mode; Activating Low Power Mode; Ats24 Operation - Motorola 8900 - Blackberry Curve Cell Phone OEM Car Charger Developer's Manual

Low Power Mode

Low Power Mode
The C24 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 C24 network connection is not lost. C24 continues to monitor the CDMA network constantly
for any incoming calls or data.
During low power mode, all of the C24 interface signals are inactive and are kept in their
previous state, prior to activating low power mode. To save power, all the C24 internal clocks and
circuits are shut down, and therefore serial communications is limited.

Activating Low Power Mode

By default, the C24 powers on in Idle mode. In this mode the C24 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 inactive state duration required by C24, in seconds, after which C24 will enter
sleep mode.
For example:
ATS24 = 1 activates low power mode after 1 second of inactivity.
ATS24 = 5 activates low power mode after 5 seconds of inactivity.
ATS24 = 0 disables low power mode (default).
Figure 2-6
Figure 2-6: ATS24 Operation
Important:
16
illustrates the ATS24 command operation.
C24 will not enter low power mode in any case when there is data present on the
serial interface or incoming from the network or an internal system task is running.
Only when processing of any external or internal system task has completed, and
C24 is inactive for the duration of ATS24, it will enter low power mode.
C24 Module Hardware Description December 15, 2008