User Guide

LE866 Hardware Design Guide

1VV0301355 Rev. 5 Page 40 of 91 2019-04-05

Unconditional Restart

To unconditionally restart the LE866, the pad RESET* must be tied low for at least 200

milliseconds and then released.

The maximum current that can be drained from the RESET* pad is 0,15 mA.

The hardware unconditional Restart must not be used during normal operation of the

device since it does not detach the device from the network. It shall be kept as an

emergency exit procedure to be done in the rare case that the device gets stuck waiting

for some network or SIM responses.

Do not use any pull up resistor on the RESET* line nor any totem pole digital output.

Using pull up resistor may bring to latch up problems on the LE866 power regulator and

improper functioning of the module.

The line RESET* must be connected only in open collector configuration; the transistor

must be connected as close as possible to the RESET* pin.

The unconditional hardware restart must always be implemented on the boards and the

software must use it as an emergency exit procedure.

PIN DESCRIPTION

Signal

Function

I/O

Pad

RESET*

Unconditional Reset of the Module