[PXCT-1434] Force Boot mode

content/hardware/02.uno/boards/uno-q/tutorials/11.host-mode/host-mode.md

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+---
+title: Force USB Host Mode on UNO Q
+description: USB host mode is not automatically enabled when the UNO Q is powered via its 5V / VIN pin. This tutorial explains how to enable it.
+author: Karl Söderby
+tags: [UNO Q, USB, Host Mode, JCTL, PMIC]
+---
+
+When the **Arduino® UNO Q** is powered externally via the 5V/VIN pin rather than the USB-C® port, the **Power Management Integrated Circuit (PMIC)** does not detect a USB connection and therefore does not enable the VBUS lines, preventing USB peripherals connected to the USB-C® port from being properly powered and initialized/detected.
+
+To work around this, you can force USB host mode by bridging two pins on the **JCTL** header. This instructs the USB-C® controller to operate as a host regardless of how the board is powered.
+
+## Requirements
+
+- (x1) [Arduino® UNO Q 2GB](https://store.arduino.cc/products/uno-q) or [UNO Q 4GB](https://store.arduino.cc/products/uno-q-4gb)
+- (x1) [USB-C® cable](https://store.arduino.cc/products/usb-cable2in1-type-c)
+- Female-to-female jumper cable or jumper cap
+
+## Force Host Mode
+
+With the board **powered off**, short the two designated pins on the **JCTL** header using a jumper cable or cap, as shown in the image below.
+
+![Short the JCTL pins to force host mode](assets/enable-host-mode.png)
+
+Power the board on. The USB-C® controller will now operate in host mode and USB peripherals will be detected as expected.
+
+<Alert type="info">
+
+The JCTL header operates at **1.8 V** logic. Never attempt applying 3.3 V or 5 V signals to these pins (in this tutorial, we are simply bridging them).
+
+</Alert>
+