I have a power regulator with an output enable that can be used to shut the regulator off without actually unhooking it. I am trying to figure out how to control that using a GPIO port of a Jetson TX2 (1.8V logic).
The manufacturer of the regulator says that I will not be able to connect the output enable wire directly to a 1.8V GPIO pin because the output enable is internally pulled up to the regulator Vin (24V). They said to drive it properly I will need an open-drain circuit, which will allow your GPIO to switch the output enable pin between float and ground.
Using https://www.microcontrollertips.com/what-is-an-open-drain/ as a source I looked on Digikey to find an N-channel MOSFET that would work and I think one of these:
would. Is creating the open drain circuit a matter of connecting the output enable wire of the regulator to the mosfet drain, the Jetson GPIO to the gate and the mosfet source to ground like this? Or do I need a current limiting resistor between the GPIO and the gate?
Thanks for your help.