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
um of 1.5 seconds will turn the module off. This will initiate a
ormal power-off process, which includes disabling of all applications interfaces (UART, SIM card, audio,
he following figure illustrates the power-off timings when using the ON_N signal.
l not power off the module before 30 seconds have elapsed since it was powered-on.
ansients on the IGN line
timings when using the IGN signal.
ON_N
2.3.2.1 Turning off the module using ON_N
The ON_N signal is set high through an internal pull up resistor when power is applied to the module.
Asserting the ON_N signal low for a minim
n
etc.) and closing the network connection.
T
FIGURE 6 – ON_N power off timings
2.3.2.2 Turning off the module using IGN
This section applies only to the C-Lite standard model (without charger).
The IGN signal may be used to power off the module only if it was also used to power it on. When the
IGN signal is set low the module will turn off. This will initiate a normal power-off process, which includes
disabling of all applications interfaces (UART, SIM card, audio, etc.) and closing the network connection.
The IGN signal wil
This delay mechanism is implemented to protect the module from unexpected tr
during power up.
The following figure illustrates the power-off
FIGURE 7 – IGN power off timings
V
CC
CTS_N
RESET_N
<50000m
1500ms min
IGN
VCC
CTS_N
RESET_N
<5000ms
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