Digi XBee 3 Cellular LTE-M, User Manual, Page: 144 / 331

Power saving features and design recommendations Deep Sleep mode
Digi XBee® 3 Cellular LTE-M/NB-IoT Global Smart Modem User Guide 144
Enable and configure the low voltage shutdown feature
1. Enable the feature by setting the DO command bit 4.
2. Set the base threshold for the voltage on the XBee VCC line using the %L command . When the
voltage for the XBee VCC line goes below the base threshold, the XBee goes into a shut down
state.
3. Set the reset offset for the XBee VCC line using the %M command . The XBee resets and
resumes normal operation when the voltage reaches the base threshold set in the %L
command , plus the value of the reset offset set in the %M command .
Example
The graph shown below demonstrates this feature. In this example, AT%L (Base Threshold) is set to
0xC1C (3100 mV) and AT%M (Reset Offset) is set to 0x64 (100 mV).
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After the XBee VCC voltage drops below the base threshold of 3100 mV (set by AT%L), the XBee
goes into the shutdown state.
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When in the shutdown state, the XBee VCC voltage must rise 100 mV (set by AT%M) above the
shutdown voltage (AT%L) to reset and then resume normal operation.
Deep Sleep mode
In Deep Sleep mode the cellular component is shut off and the XBee processor is put to sleep.
Note When the XBee Smart Modem enters deep sleep mode, any MicroPython code currently
executing is suspended until the device comes out of sleep.