User's Manual
CE910-DUAL Hardware User Guide
1vv0301010 Rev .0 – 2012-07-10
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved. Page 24 of 63
TIP:
To check if the device has powered off, hardware line VAUX/PWRMON must be monitored.
When VAUX/PWRMON goes low, the device has powered off.
4.3. Hardware Unconditional Shutdown
To unconditionally shutdown the CE910-DUAL, the pad HW_SHUTDOWN* must be tied
low for at least 800 milliseconds and then released.
A simple circuit to unconditionally shutdown the module is illustrated below:
NOTE:
Do not use any pull up resistor on the HW_SHUTDOWN* line or any totem pole digital
output. Using a pull up resistor may bring latch up problems on the CE910-DUAL power
regulator and result in improper functioning of the module. The line HW_SHUTDOWN*
must be connected only in open collector configuration.