User's Guide
LE866 HARDWARE USER GUIDE 1vv0301210 Rev.0 – Preliminary • 2015-09-02 30 of 68
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Reset
To unconditionally reboot 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
I
G4
OPERATING LEVELS
The RESET* line is connected to VBATT with a Pull Up so the electrical levels are on this pin are aligned
to the main supply level.
WARNING:
The hardware unconditional Reset 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.