User's Guide

LE910Cx HW User Guide
Doc#: 1VV0301298
Rev. 13.0 Page 43 of 124 2019-07-15
Figure 5: LE910Cx Initialization and Activation
NOTE:
SW_RDY signal is available on GPIO_08 (by default GPIO_08 functions as
SW_RDY)
NOTE:
To check whether the LE910Cx has completely powered on, monitor the
SW_RDY hardware line. When SW_RDY goes high, the module has
completely powered on and is ready to accept AT commands.
NOTE:
During SW initialization of the LE910Cx, the SW configures all pads and
interfaces to their 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 internally
pulled up. 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.
1 Sec < T_Hold < 2 Sec
VBATT
ON_OFF
SW_RDY
T_RDY < 20 Sec
V_AUX
PWRMON
18 Sec < T_PWRMON < 20 Sec
OFF State Initialization State Active State
OK to Send AT
commands
All interfaces and pins
configured