LE910Cx Hardware Design Guide
1VV0301298 Rev.40 Page 45 of 149 2023-03-16
Not Subject to NDA
A flow chart showing the AT commands managing procedure is displayed below:
Note: To check whether the LE910Cx has completely powered on,
monitor the SW_RDY hardware line. When SW_RDY becomes high,
the module is completely powered on and is ready to accept AT
commands.
Note:
During the SW initialization of the LE910Cx, the SW configures
all pads and interfaces to the desired mode. When PWRMON goes
high, this indicates that the initialization of all I/O pads is completed.
Note:
Do not use any pull-up resistor on the ON_OFF_N line as it is
pulled up internally. Using a pull-up resistor may cause latch-up
problems on the LE910Cx power regulator and improper powering
on/off of the module. The ON_OFF_N line must be connected only in
an open-collector configuration.
Note: For systems not requiring controlled power ON/OFF,
automatic power on can be supported by shorting the ON_OFF
signal directly to GND
In this case, the module will start power on sequence immediately
after VBATT supply is applied
Note:
Active low signals are labeled with a name that ends with "#" or with
“_N”
Note:
To avoid a back-powering effect, it is recommended to prevent any
HIGH logic level signal from being applied to the module’s digital pins when
it is powered OFF or during an ON/OFF transition.
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