Usually you would reset the STEF05 using e.g. a MOSFET, as shown in the datasheet, fig. 4.
The datasheet gives a recommendation how to handle the Enable/Fault pin (section 5.4): "[...]the device can be reset either by cycling the supply voltage or by pulling down the Enable pin below the Vil threshold and then releasing it."
The datasheet also contains the value of Vil.
/Peter
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