FAN enable
Added by Keith Murison 4 days ago
Hello,
Is there a Linux software command to enable the +5V Fan from the HPS ? or a register we can write to to enable the FAN ?
We see that the SOM PCBA gets relatively hot > +50C, and we do not want to over stress the development board kit.If there is no easy way to enable the FANhttps://www.digikey.ca/en/products/detail/onsemi/FDV301N/458851Can we simply add a pull-up resistor to enable the N-CH mosfet? Vgs_th = 1.06V ... I assume the FPGA bank IO voltage is 1.8V .. but I am not 100% sure .. maybe it is 1.2V
Thank you,
Keith.
Replies (1)
RE: FAN enable - Added by Mike Fiorenza 4 days ago
Keith,
The FAN_EN GPIO can be enabled by exporting the GPIO in sysfs and driving it high.
root@mitysom-agilex5:~# cat /sys/kernel/debug/gpio gpiochip3: GPIOs 400-423, parent: platform/10c03300.gpio, 10c03300.gpio: gpio-420 (ETH1_RESETN ) gpio-423 (FAN_EN ) gpiochip2: GPIOs 424-447, parent: platform/10c03200.gpio, 10c03200.gpio: gpio-427 (USB_RESETN ) gpio-429 (SDCARD_PRESENT ) gpiochip1: GPIOs 448-479, parent: platform/10d120e8.gpio, 10d120e8.gpio: gpiochip0: GPIOs 480-511, parent: platform/10d120e4.gpio, 10d120e4.gpio: gpio-480 (FABRIC_RESET ) gpio-481 (DEBUG_LED1 |:status ) out lo gpio-482 (DEBUG_LED2 |:status_1 ) out lo root@mitysom-agilex5:~# echo 423 > /sys/class/gpio/export root@mitysom-agilex5:~# echo out > /sys/class/gpio/gpio423/direction root@mitysom-agilex5:~# echo 1 > /sys/class/gpio/gpio423/value
