UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

4.2Turning OFF the UC864-E

The turning off of the device can be done in three ways:

By software command (see UC864-E Software User Guide)

By hardware shutdown

By Hardware Unconditional Restart

When the device is shut down by software command or by hardware shutdown, it issues to the network a detach request that informs the network that the device will not be reachable any more.

4.2.1 Hardware shutdown

To turn OFF UC864-E, first, you MUST cut off supplying power to the USB_VBUS pin, then the pad ON# must be tied low for at least 2 seconds and then released.

The same circuitry and timing for the power on shall be used.

The device shuts down after the release of the ON# pad.

NOTE: To turn OFF UC864-E, first of all, you MUST cut off supplying power to the USB_VBUS, or the module does not turn off

TIP: To check if the device has powered off, the hardware line PWRMON should be monitored. When PWRMON goes low, the device has powered off.

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Telit Wireless Solutions manual Turning OFF the UC864-E, Hardware shutdown