DCS WDU models User's Guide download pdf (Page 20)

UC864-E/G/WD/WDU Hardware User Guide

1vv0300766a Rev.4

- 03/02/09

4.3. Turning OFF the UC864-E/G/WD/WDU

Turning off the device can be done in three ways:

• by software command (see UC864-E/G/WD/WDU 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.

4.3.1. Hardware Shutdown

To turn OFF UC864-E/G/WD/WDU the pad ON# must be tied low for at least 2

seconds and then released. Same circuitry and timing for the power on must be used.

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

4.3.2. Hardware Unconditional Restart

To unconditionally restart UC864-E/G/WD/WDU, the pad RESET# must be tied low

for at least 200 milliseconds and then released.

A simple circuit to do it is:

NOTE:

To turn OFF UC864-E version, first of all, you MUST cut off the supplying power to

the USB_VBUS, or the module does not turn off.

TIP:

To check if the device has powered off, hardware line PWRMON must be monitored.

When PWRMON goes low, the device has powered off.

RESET#

Unconditional Restart

impulse

GND

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DCS WDU models User's Guide Page 20