Telit Wireless Solutions CE910-DC, Hardware User'S Manual

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To turn on the CE910, 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 CE910 module, the CE910 module is not active yet because the boot sequence of
CE910 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 CE910 during the Initialization state as below. The
CE910 module needs at least 10 seconds after the PWRMON goes High to become operational by
reaching the activation state.