L
LE920 Hardware User Guide
1vv0301026 Rev.0 - draft4 – 2013-05-
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved.
Page 32 of 76
4.4.
Summary of Turning ON and OFF the module
Below chart describes the overall sequences for Turning ON and OFF.
NOTE:
Do not use any pull up resistor on the SHDN_N line or any totem pole digital output. Using
pull up resistor may bring to latch up problems on the LE920 power regulator and improper
functioning of the module. The line SHDN_N must be connected only in open collector
configuration.
Note:
The unconditional hardware SHDN_N must always be implemented on the boards and the
software must use it as an emergency exit procedure, and
not
as a normal power-off operation
