The USB Host Shield manual explains board layout, power options, and how to modify pins for full‑size and Mini versions.
This manual describes the hardware of the USB Host Shield, covering both the full‑size 2.0 revision and the Mini 1.1 revision. It details connectors, pads, jumpers, and the differences between the two form factors, as well as how to adapt the shield to non‑standard Arduino boards and alternative power configurations.
The guide also provides step‑by‑step instructions for power selection (5 V or 3.3 V), interface modifications such as re‑assigning the SS and INT pins, and optional boost‑converter solutions for supplying 5 V VBUS when using 3.3 V‑only boards.
| USB host controller | MAX3421E |
|---|---|
| Crystal frequency | 12 MHz |
| Operating voltage of controller | 3.3 V |
| VBUS voltage (USB spec) | 5 V |
| Power select jumpers | 5 V and 3.3 V |