User's Manual

LE910 Hardware User Guide

1vv0301089 Rev.3 – 09-06-2014

Upon turning on LE910 module, The LE910 is not activated yet because the boot sequence of

LE910 is still going on internally. It takes about 10 seconds to complete the initializing the

module internally.

For this reason, it would be useless to try to access LE910 during the Initialization state as

below.

To get the desirable stability, the LE910 needs at least 15 seconds after the PWRMON goes high

to become operational by reaching the activation state.

NOTE:

Don’t use any pull up resistor on the ON_OFF* line, it is internally pulled up. Using pull up

resistor may bring to latch up problems on the LE910 power regulator and improper power

on/off of the module. The line ON_OFF* must be connected only in open collector or open

drain configuration.

In this document all the lines that are inverted, hence have active low signals are labelled with a

name that ends with”#”,”*” or with a bar over the name.

During the Initialization state, any kind of AT-command is not available. DTE must be waiting

for the Activation state to communicate with LE910.

To check if the device has powered on, the hardware line PWRMON should be monitored.