Feather add-on that adds USB Host capability via the MAX3421E chip, communicating over SPI plus an IRQ pin. Includes a 5 V 1 A booster with 500 mA fuse. Supports HID (keyboard, mouse) and basic mass storage via TinyUSB on RP2040, ESP32-S2/S3, nRF52840, and SAMD21/51.
USB Type-A host port for sending or receiving data from an attached USB device with the MAX3421E, source: https://learn.adafruit.com/adafruit-usb-host-featherwing-with-max3421e/pinouts
SPI MOSI signal between Feather host and MAX3421E USB host chip, source: https://learn.adafruit.com/adafruit-usb-host-featherwing-with-max3421e/pinouts
SPI MISO signal between Feather host and MAX3421E USB host chip, source: https://learn.adafruit.com/adafruit-usb-host-featherwing-with-max3421e/pinouts
SPI clock signal between Feather host and MAX3421E USB host chip, source: https://learn.adafruit.com/adafruit-usb-host-featherwing-with-max3421e/pinouts
SPI chip-select for the MAX3421E on the FeatherWing, also broken out near the middle of the board, source: https://learn.adafruit.com/adafruit-usb-host-featherwing-with-max3421e/pinouts
Interrupt request output from the MAX3421E USB host chip to the Feather host, source: https://learn.adafruit.com/adafruit-usb-host-featherwing-with-max3421e/pinouts
MAX3421E general-purpose multiplexed push-pull output pin for advanced users, source: https://learn.adafruit.com/adafruit-usb-host-featherwing-with-max3421e/pinouts
Disable 5V power to the USB-A port by tying this pin to ground, source: https://learn.adafruit.com/adafruit-usb-host-featherwing-with-max3421e/pinouts
Open rear jumper; soldering it connects 5V enable to MAX3421E GPOUT0 for software control over SPI, source: https://learn.adafruit.com/adafruit-usb-host-featherwing-with-max3421e/pinouts
Reset line connected to the FeatherWing reset button and reset pin, source: https://learn.adafruit.com/adafruit-usb-host-featherwing-with-max3421e/pinouts
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| USB-A | left-end | Unknown | USB Type-A host port for sending or receiving data from an attached USB device with the MAX3421E, source: https://learn.adafruit.com/adafruit-usb-host-featherwing-with-max3421e/pinouts | 5V bus power from onboard 5V 1A boost supply when enabled |
| MOSI | SPI | SPI MOSI signal between Feather host and MAX3421E USB host chip, source: https://learn.adafruit.com/adafruit-usb-host-featherwing-with-max3421e/pinouts | ||
| MISO | SPI | SPI MISO signal between Feather host and MAX3421E USB host chip, source: https://learn.adafruit.com/adafruit-usb-host-featherwing-with-max3421e/pinouts | ||
| SCK | SPI | SPI clock signal between Feather host and MAX3421E USB host chip, source: https://learn.adafruit.com/adafruit-usb-host-featherwing-with-max3421e/pinouts | ||
| CS | SPI | SPI chip-select for the MAX3421E on the FeatherWing, also broken out near the middle of the board, source: https://learn.adafruit.com/adafruit-usb-host-featherwing-with-max3421e/pinouts | ||
| IRQ | GPIO | Interrupt request output from the MAX3421E USB host chip to the Feather host, source: https://learn.adafruit.com/adafruit-usb-host-featherwing-with-max3421e/pinouts | ||
| GPX | towards-centre | GPIO | MAX3421E general-purpose multiplexed push-pull output pin for advanced users, source: https://learn.adafruit.com/adafruit-usb-host-featherwing-with-max3421e/pinouts | |
| 5V Enable | towards-centre | Control | Disable 5V power to the USB-A port by tying this pin to ground, source: https://learn.adafruit.com/adafruit-usb-host-featherwing-with-max3421e/pinouts | Controls 5V USB-A bus power; active behaviour is disable when tied to GND |
| 5V Enable Jumper | back | Unknown | Open rear jumper; soldering it connects 5V enable to MAX3421E GPOUT0 for software control over SPI, source: https://learn.adafruit.com/adafruit-usb-host-featherwing-with-max3421e/pinouts | |
| RST | top-left-button | Control | Reset line connected to the FeatherWing reset button and reset pin, source: https://learn.adafruit.com/adafruit-usb-host-featherwing-with-max3421e/pinouts |
USB Type-A host port for sending or receiving data from an attached USB device with the MAX3421E, source: https://learn.adafruit.com/adafruit-usb-host-featherwing-with-max3421e/pinouts
SPI MOSI signal between Feather host and MAX3421E USB host chip, source: https://learn.adafruit.com/adafruit-usb-host-featherwing-with-max3421e/pinouts
SPI MISO signal between Feather host and MAX3421E USB host chip, source: https://learn.adafruit.com/adafruit-usb-host-featherwing-with-max3421e/pinouts
SPI clock signal between Feather host and MAX3421E USB host chip, source: https://learn.adafruit.com/adafruit-usb-host-featherwing-with-max3421e/pinouts
SPI chip-select for the MAX3421E on the FeatherWing, also broken out near the middle of the board, source: https://learn.adafruit.com/adafruit-usb-host-featherwing-with-max3421e/pinouts
Interrupt request output from the MAX3421E USB host chip to the Feather host, source: https://learn.adafruit.com/adafruit-usb-host-featherwing-with-max3421e/pinouts
MAX3421E general-purpose multiplexed push-pull output pin for advanced users, source: https://learn.adafruit.com/adafruit-usb-host-featherwing-with-max3421e/pinouts
Disable 5V power to the USB-A port by tying this pin to ground, source: https://learn.adafruit.com/adafruit-usb-host-featherwing-with-max3421e/pinouts
Open rear jumper; soldering it connects 5V enable to MAX3421E GPOUT0 for software control over SPI, source: https://learn.adafruit.com/adafruit-usb-host-featherwing-with-max3421e/pinouts
Reset line connected to the FeatherWing reset button and reset pin, source: https://learn.adafruit.com/adafruit-usb-host-featherwing-with-max3421e/pinouts
Shield
Verify supply voltage and logic levels before powering up.
Module pins: MOSI, MISO, SCK. Schematik maps them to your board in the app.
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