User's Manual

UE910 V2 Hardware User Guide
1VV0301065 Rev.1 – 2013-12-12
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved. Page 20 of 67
4. Hardware Commands
4.1. Turning on the UE910 V2 module
To turn on the UE910 V2, the pad ON_OFF* must be tied low for at least 1 second and then released.
The maximum current that can be drained from the ON_OFF* pad is 0.1 mA.
A simple circuit to power on the module is illustrated below:
4.1.1. Initialization and Activation State
Upon turning on UE910 V2 module, the UE910 V2 module is not active yet because the boot
sequence of UE910 V2 is still executing internally. It takes about 10 seconds to complete the
initialization of the module internally.
For this reason, it would be useless to try to access UE910 V2 during the Initialization state as below.
The UE910 V2 module needs at least 10 seconds after the PWRMON goes High to become
operational by reaching the activation state.