> For the complete documentation index, see [llms.txt](https://nxp.gitbook.io/hovergames/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://nxp.gitbook.io/hovergames/rddrone-fmuk66/connectors/external-spi.md).

# External SPI bus

## Connector pinout

| Pin | Signal   | Voltage |
| --- | -------- | ------- |
| 1   | VCC      | +5.0V   |
| 2   | SPI CLK  | +3.3V   |
| 3   | SPI MISO | +3.3V   |
| 4   | SPI MOSI | +3.3V   |
| 5   | SPI CS   | +3.3V   |
| 6   | GPIO EXT | +3.3V   |
| 7   | GND      | GND     |

## RDDRONE-FMUK66 Rev. C schematic

![](/files/-LVsCg8ZlLrqLDXCpkrB)

## RDDRONE-FMUK66 Rev. B schematic

{% hint style="danger" %}
Rev. B (and older boards) are **not supported** anymore. This information is left for reference.
{% endhint %}

![](/files/-LOrtzOW_Izl4BWIVsYQ)