The HP Module Breakout Board (XB112) designed to make the interfaces from the XM112 module accessible for evaluation and debug. It also enables the flashing of the XM112 via USB-UART or SW-DP. The XM112 is connected to the XB112 via a board-to-board connector on the top side of the PCB.
The XB112 is powered via USB connectors. USB1 powers the USB-UART chip (U4) and the XM112. USB2 powers the USB-SPI chip (U5). If no SPI data is needed, the USB2 can be left unconnected. USB1 must however always be connected. If the USB-UART interface is not used, a dedicated USB charger can be inserted into USB1.