Technical information

Chapter 2: Hardware Interface Description
November 15, 2008 G24-L Module Hardware Description 15
Turning the G24-L Off
There are several ways to turn the G24-L off:
• Asserting the ON_N signal low for a minimum of 2 seconds.
• Setting the IGN signal low.
• AT command.
Turning the G24-L Off Using ON_N
Asserting the ON_N signal low for a minimum of 2 seconds will turn G24-L 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.
Figure 2-5 illustrates the power-off timings when using the ON_N signal.
Figure 2-5: ON_N Power Off Timing
Turning the G24-L Off Using IGN
The IGN signal may be used to power off G24-L only if it was also used to power it on. When the
IGN signal is set low, G24-L 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 will not power off G24-L before 30 seconds have elapsed since G24-L was
powered-on. This delay mechanism is implemented to protect G24-L from unexpected transients
on the IGN line during power up, particularly when applying vehicle cranking waveforms.