Telit Wireless Solutions HE910-EU V2, Hardware User'S Manual

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To turn on the HE910 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:
Upon turning on HE910 V2 module, the HE910 V2 module is not active yet because the boot
sequence of HE910 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 HE910 V2 during the Initialization state as
below. The HE910 V2 module needs at least 10 seconds after the PWRMON goes High to
become operational by reaching the activation state.