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.

../_images/pcm-065_fan-callouts.png

Requirements

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

Recommended Fan Assembly

Item

Description

Link

Heat Sink

(29mmx29mmx9.5mm)

Digikey link (heat sink)

Fan

DC axial fan, 25mm square x 10mm

Digikey link (fan)

Female Connector

2xpin keyed header

Digikey link

Crimping Terminals

2x crimping jackets

Digi link

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.

    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