4.3.2 Direct USB Connection

For USB applications on SAM R34, there is a directly connected USB port designated TARGET_USB. This is exposed as a Micro-B jack designated J201. The TARGET_USB port includes required ESD suppression and power management circuitry. A GPIO is used to detect the VBUS voltage on the connector, to detect when a TARGET USB cable is connected in Self-Powered mode. In USB Host mode, VBUS voltage is provided by the kit and cannot identify the connected device; therefore, another GPIO is used to detect the USB ID of the device.