> 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

![](https://1329960936-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-L9GLtb-Tz_XaKbQu-Al%2F-LVsC1W9Lh4_z_Pu846c%2F-LVsCg8ZlLrqLDXCpkrB%2FC-SPI.png?alt=media\&token=de539d86-3cb4-479a-b93d-ff2869522a34)

## RDDRONE-FMUK66 Rev. B schematic

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

![](https://1329960936-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-L9GLtb-Tz_XaKbQu-Al%2F-LOrvCVzlhjwif35PmiG%2F-LOrtzOW_Izl4BWIVsYQ%2FSPI.PNG?alt=media\&token=8147777b-4a47-48e4-888c-794b204d8855)