NL865B1 HW Design Guide
1VV0301450 Rev. 1
Page
35
of
72
2017-11-20
Unconditional Restart
To unconditionally restart the NL865B1, 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 1 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 NL865B1 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 application board
as the software must be able to use it as an emergency exit procedure.
PIN DESCRIPTION
Signal
Function
I/O
PAD
RESET*
Unconditional Reset of the Module
I
47
OPERATING LEVELS
The RESET* line is connected to 1.8V with a Pull Up so the electrical levels are on this pin
are aligned with the other CMOS 1.8V digital I/O’s.
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.
