Exposing USB Pins on nRF52x

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frednikgohar
 
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Joined: Wed Aug 11, 2021 2:33 pm

Exposing USB Pins on nRF52x

Post by frednikgohar »

I'm 3D printing housing for the project I use my Itsy boards in and I'd like a simple way to update the firmware without having to open the housing. I tried exposing the micro usb port to the outside but the plastic housing is not reliable enough to support usb cable inserted/removed multiple times.

Since I'm making my own PCB to mount everything, I was hoping there'd be an easy way to expose the USB on a simple 4pin header... but what pins would they be? Is there any documentation on this?

I'd appreciate anything anyone can share.

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dastels
 
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Re: Exposing USB Pins on nRF52x

Post by dastels »

It would depend on the exact chip you're using, but you would need 5v, ground, as well as D+ and D-. All the Adafruit boards have schematics available so if there's one with the chip you're using, that can be used to find which MCU pins you need. Or you could just check the datasheet for the MCU you're using.

Dave

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frednikgohar
 
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Joined: Wed Aug 11, 2021 2:33 pm

Re: Exposing USB Pins on nRF52x

Post by frednikgohar »

This is the board I'm using:

https://www.adafruit.com/product/4481

I understand on the schematics the connector connects to the nRF chip... but are they exposed anywhere on the PCB board? I prefer not having to wire-wrap things... so hoping the pins (D+ and D-) are exposed somehow somewhere.

Any thoughts?

Here's the schematic: https://cdn-learn.adafruit.com/assets/a ... 1579387035

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