User Guide

LM960 HW Design Guide
1VV0301485 Rev. 15 Page 48 of 88 2020-08-13
Information – VBATT must not be removed before Shutdown
Indicator goes LOW.
Warning – Not following the recommended shut-down procedures
might damage the device and consequently void the warranty.
6.3.3. Unconditional Shutdown
To turn off the LM960, SYSTEM_RESET_N pad must be asserted low for more than 1
seconds and then it should be kept low.
When the SYSTEM_RESET_N is asserted low more than 1 second, the LM960 enters
finalization state and after the end of the shutdown process Shutdown Indicator will go to
low.
Usually, it takes the LM960 less than 100 milliseconds from asserting
SYSTEM_RESET_N until reaching a complete shutdown. The DTE should monitor the
status of Shutdown Indicator to observe the actual power-off.
Information – To completely shut down the LM960 module, the
SYSTEM_RESET_N pin must be asserted and kept low.
Otherwise, the LM960 will turn on again after shut down.
Information – To avoid a back-powering effect, it is recommended to
avoid having any HIGH logic level signal applied to the digital pins of
the module when it is powered OFF or during an ON/OFF transition.