Power - Acconeer XM122 Hardware User's Manual

IoT module EVK hardware user guide

3.1.2. Power

The XB122 is powered via the USB connector. The USB 5V power domain supplies the USB-UART
chip (U1). If the USB-UART interface is not used, a dedicated USB charger can be used.
When the LED D1 on the XB122 is lit, the USB-UART chip is powered and ready to use. If SW1 is
set to "VBUS" it also means that XM122 is powered and ready to use (if connected to the board-to-
board connector on the top side of XB122).
The XM122 can be powered either from the USB 5V power domain or from a CR2477 battery
connected to the battery connector CON1. The CR2477 battery is not included in the EVK. The power
source for XM122 is determined by the setting of the switch "SW1". The XM122 is powered via the
board-to-board connector J3. If XM122 is powered from the battery, the XB122 can still be powered
from the USB 5V. If one doesn't want to use the USB-UART interface and XM122 is powered from
the battery, the USB can be left unconnected. For details regarding the power management on XB122,
refer to the XB122 product brief.
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