LE910Cx
Hardware User Guide
1VV0301298 Rev. 1.05 - 2017-06-18
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Page
48 of 117
5.
Hardware Commands
5.1.
Turning on the LE910Cx Module
To turn on the LE910Cx module, the ON/OFF# pad must be asserted 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. This pin is internally
pulled up; customers should expect to see ~ 800 mV on the output.
Figure 4 illustrates a simple circuit to power on the module using an inverted buffer output.
Figure 4: Power-on Circuit
NOTE:
Recommended values R2 = 47k
Ω
, R1 = 10k
Ω
.
5.2.
Initialization and Activation State
After turning on the LE910Cx module, the LE910Cx is not yet activated because the SW initialization
process of the LE910Cx module is still in process internally. It takes some time to fully complete the
HW and SW initialization of the module.
For this reason, it is impossible to access LE910Cx during the Initialization state.
As shown in Figure 5, the LE910Cx becomes operational (in the Activation state) at least 20 seconds
after the assertion of ON_OFF.
NOTE:
During the Initialization state, AT commands are not available. The DTE host must wait for the
Activation state prior to communicating with the LE910Cx.