Fan
=====

The phyCORE-i.MX8X development kit provides fan connectivity via a 2-pin Hirose connector at X74 and a 3-pin connector at X73. The fan is intended to be mounted directly to the processor heat sink for thermal management, both of which are included with the phyCORE-i.MX8X development kit. The X74 connector is connected directly to the VCC_5V rail and the X73 connector is connected directly to the VCC_12V rail.

.. image:: ../../images/phycore-imx8x/pcm-065_fan-callouts.webp
  :width: 800px


Requirements
--------------

Below is a table that includes some information about the fan and heat sink included with the development kit.

.. list-table:: Recommended Fan Assembly
   :header-rows: 1

   * - Item
     - Description
     - Link
   * - Heat Sink
     - (29mmx29mmx9.5mm)
     - `Digikey link (heat sink) <https://www.digikey.com/en/products/detail/advanced-thermal-solutions-inc/ATS-55290D-C1-R0/1284984>`_
   * - Fan
     - DC axial fan, 25mm square x 10mm
     - `Digikey link (fan) <https://www.digikey.com/en/products/detail/sunon-fans/MF25100V1-1000U-A99/7805269>`_
   * - Female Connector
     - 2xpin keyed header
     - `Digikey link <https://www.digikey.com/en/products/detail/amphenol-cs-fci/10114826-00002LF/2658910>`_
   * - Crimping Terminals
     - 2x crimping jackets
     - `Digi link <https://www.digikey.com/en/products/detail/hirose-electric-co-ltd/DF13-2630SCF/566967>`_


Controlling the Fan
--------------------

* Enabling/disabling the fan is controlled by the IO_EXP_FAN_CTRL GPIO signal. The following commands can be used to enable/disable the fan.

  .. code-block:: none
    :caption: Target (Linux)

    root@imx8x-phycore-kit:~# echo 473 > /sys/class/gpio/export
    root@imx8x-phycore-kit:~# echo out > /sys/class/gpio/gpio473/direction
    root@imx8x-phycore-kit:~# echo 1 > /sys/class/gpio/gpio473/value
    root@imx8x-phycore-kit:~# echo 0 > /sys/class/gpio/gpio473/value