AGX Orin Fan PWM pull down resistor in Design Guide

Autonomous Machines Jetson & Embedded Systems Jetson AGX Orin
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1

Hello, I am designing a carrier board for an AGX Orin module. On the fan section, I noticed that the FAN_PWM signal is an open-drain per the design guide. However, the pin is pulled down via a 100k Ohm resistor, which will not do anything.

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The reference design also have a pull down resistor too.

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Is it a mistake on the design guide or is it something that I might have missed

3

Hi, the 100k is to set a stable pin status when no output. This pin is not used as OD function. It is used as SFIO in pinmux as PWM output.