Power On/Off Operation
14 Module Hardware Description May 31, 2008
Figure 2-4 illustrates the power-on process using the IGN signal.
Figure 2-4: IGN Power On Timing
Turning the W24 Off
There are several ways to turn the W24 off:
•Asserting the ON_N signal low for a minimum of 2 seconds.
•Setting the IGN signal low.
•Turning the W24 Off using AT+iMRST.
Note: If the unit was powered up by ON_N signal, W24 will ignore attempt to turn it off by
setting the IGNITION to low.
Attempts to power off the module within first 8 seconds from powerup must not be done.
The unit will ignore such attempts.

Turning the W24 Off Using ON_N

The ON_N signal is internally pulled-up when power is applied to W24.
Asserting the ON_N signal low for a minimum of 2 seconds will turn W24 off. This will initiate a
normal power-off process, which includes G24 power down (stacked configuration) and disabling
of all applications interfaces (UART, USB, etc.).