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Topic: [Resolved] Arduino compatible device prototype working on some ports not others (Read 4283 times) previous topic - next topic


I added that soft start idea on the hot plug simulation and it looks good.
I changed the 10k to 1k, and set the P-CH model so it works sort of like the part I use, but you can change the values on the sim before closing the switch.
The P-CH MOSFET I have been using for this type of stuff is:
(DMB is the device label printed on package.)
my projects: https://github.com/epccs


Thank you so much Ron! This MOSFET will work perfectly! There will be about 0.02V max voltage across the MOSFET (VDS) when fully and supplying 200mA so it not a bit deal. One of these days I'll dig up some info on what determines this voltage in my physics books.

I have a few SOT-23-3 breakout boards so I can put this to a test once I get the parts.
Serial LCD keypad panel,phi_prompt user interface library,SDI-12 USB Adapter


More to report back. I finally removed the two 150 ohm resistors I placed inline with D- and D+. Bingo! Before removing them, with VCC disconnected from VUSB, the device is not recognized by one of the USB 3 ports (charging port) and recognized by the other. Now both recognize the device. The only remaining issue is the current spike if I connect VCC with VUSB. I'll address this issue with the P-channel enhancement MOSFET in my next board version.

Thank you both CR and Ron!
Serial LCD keypad panel,phi_prompt user interface library,SDI-12 USB Adapter

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