User's Manual
Table Of Contents
- Revision History
- 1 Regulatory Requirement
- 2 Hardware Interface Description
- 2.1 Operating Modes
- 2.2 Power Supply
- 2.3 Power On/Off Operation
- 2.4 Low Power Mode
- 2.5 Real Time Clock
- 2.6 Serial Interfaces
- 2.7 Removable-User Identify Module (R-UIM) Interface
- 2.8 Audio Interface
- 2.9 A/D Interface
- 2.10 Control and Indicators Interface
- 2.11 Antenna Interface
C24 Hardware Interface Manual
Version 0.3
Temporary termination of low power mode occurs when the module switches from Sleep mode to Idle
mode for a defined period, and then returns automatically to Sleep mode.
Using the WKUPI_N signal
The WKUPI_N signal is an active low input, which is set high by default. By asserting this signal low the
application can wake-up the module from low power mode and switch to Idle mode.
The module will remain in Idle mode, awake and fully active, as long as WKUPI_N signal remains low.
When this signal is set high again, the module will return to Sleep mode automatically, according to the
ATS24 settings.
FIGURE 11 – WKUPI_N signal operation
CTS_N
Module
A
TS24
Sleep
Idle
Disabled
Enabled
WKUPI_N
15ms
The WKUPI_N signal must be used to wake up the module from low power mode if the serial interface
has been disabled by the AT+MSCTS command.
Incoming Network Data
During low power mode the module continues to monitor the network for any incoming data, message or
voice call.
When the module 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 it wakes up to
Idle mode all the interfaces are enabled.
Depending on the type of network indication and the application settings, the module may operate several
methods, which are configurable by AT commands, to alert the application of the incoming data:
Enable the WKUPO_N 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_N) signal.
Data on the Serial interface
During low power mode, serial communications is limited to short periods, while the module is paging the
network. When the serial interface is active, data can be exchanged between the application and the
module.
The module will not return to low power mode until the serial interface transmission is completed and all
the data is processed.
Only when the serial interface transfer is completed and the data is processed, The module will return to
low power mode automatically, according to the ATS24 settings.
FIGURE 12 – Serial Interface data
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