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
FIGURE 4 – ON_N power-on timings
ON_N
V
CC
CTS_N
RESET_N
<5000ms
200ms min
2.3.1.2 Turning on the module using IGN
This section applies only for the C-Lite standard model (without charger).
To turn on the module this signal must be set high. The IGN signal must remain high for the duration of
the module’s operation. The module powers down when the IGN signal is returned to its low state.
The following figure illustrates the power-on process using the IGN signal.
FIGURE 5 – IGN power-on timings
IGN
V
CC
CTS_N
RESET_N
<5000ms
A typical IGN implementation is shortening IGN to VCC. In this method applying power to the module,
shall also turn on the module simultaneously.
2.3.2 Turning the Module Off
There are several ways to turn the module off:
Asserting the ON_N signal low for a minimum of 1.5 seconds.
Setting the IGN signal low
Low power automatic shut down
AT command
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