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 20 of 63
4. Hardware Commands
4.1. Turning on the CE910-DUAL module
To turn on the CE910-DUAL, 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 CE910-DUAL module, the CE910-DUAL module is not active yet because
the boot sequence of CE910-DUAL 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-DUAL during the Initialization
state as below. The CE910-DUAL module needs at least 10 seconds after the PWRMON goes
High to become operational by reaching the activation state.