User's Manual

LE920A4 HW User Guide Hardware Commands
Doc#: 1VV0301261 Turning off the Module
Rev. 4.3 Page 52 of 123 2017-12-07
NOTE:
Asserting t
RESET
low for period longer than 2000 milliseconds will cause the
module to shut down.
5.3.4. Unconditional Hardware Shutdown
To unconditionally shut down the module, the SHDN_N pad must be tied low for at least
200 milliseconds and then released.
A simple circuit for applying unconditional shutdown is shown below:
Figure 9: Circuit for Unconditional Hardware Shutdown
The system power down timing for using SHDN_N is shown below
Figure 10 Power down timing using SHDN_N
200mS Sec < T_Hold
VBATT
SHDN_N
SW_RDY
T_RDY ~0 Sec
V_AUX
PWRMON
T_PWRMON ~0 Sec
OFF StateActive State