User Guide

LM960 HW Design Guide
1VV0301485 Rev. 15 Page 43 of 88 2020-08-13
Parameter Min Max Unit Comment
VOL Output low level 0V 0.4V [V]
IIL Low-level input leakage
current
-- 1000 [uA] No pull-up
IIH High-level input leakage
current
-20 20 [uA] No pull-down
Power On
The LM960 is automatically turning on when the VBATT is supplied.
Information – To turn on the LM960 module, the SYSTEM_RESET_N
pin must not be asserted low.
6.2.1. Initialization and Activation State
After turning on the LM960, the module is not instantly activated because the SW
initialization process takes some time to complete.
For this reason, it is recommended not to communicate with the LM960 during the
Initialization phase.
As soon as the AT command interface is accessible via USB port, Boot OK line transitions
to high but this does not imply that the device is fully operational yet.
One of GPIO pins can be configured as Shutdown indicator by means of AT#SHDNIND
command: in that case, that GPIO will also work as Boot OK line when the module is
booting.
Please refer to AT Commands Reference Guide for additional details.
In general, as shown in below figure, the LM960 becomes fully operational (in the
Activation state) at least 35 seconds after the VBATT is supplied.