3.2.2 Target USB Connection

For USB applications on the WLR089U0 module, there is a directly connected USB port designated as TARGET_USB, which is exposed as a Micro-AB jack (J201). The TARGET_USB port includes required ESD suppression and power management circuitry. A General Purpose I/O (GPIO) pin is used to detect the VBUS voltage on the connector, to detect when a TARGET USB cable is connected in Self-Powered mode. In the USB Host mode, the 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.