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complacentsee
MemberUnfortunately the repair didn’t go as planned. I didn’t have any issue replacing the mcu but it doesn’t run. I can flash xboot onto it and it verifies but it can’t be flashed with avrdude. I flashed the full firmware onto it but that either doesn’t work or only responds with errors serially.
Not sure if it is my AVRISP clone or some other issue. Perhaps my board is damaged.
MemberFrom what I can tell it works fine on windows as well. When I paired it it just generated a COM3 and COM4 and chillipeppr was able to find it fine. My TinyG is still waiting it’s replacement uProc so I can only assume it will work beyond that.
MemberThanks for the link. Amazon has one available on prime so I had to pick one up. I think I’ll be able to repair my unit with something like that.
Right now it looks like functional again now that I have the 5 volt rail repaired but the microprocessor lost it’s program or needs to be replaced.
MemberYeah. They are USB 2.0 full speed and not high speed. The FTDI on the TinyG indicates its full speed on the data sheets.
The chip can do low speed and full speed but needs manual selection. I jushard circuited mine for full speed and decided to take the 5V directly from the TinyG instead of dealing with another adaptor. Plus I didn’t want to have another adaptor that may for some reason reference ground differently and protect the PC but not the TinyG.
MemberBasically it would be using an Analog Devices ADuM4160 USB digital isolator.
I tossed my eagle schematics and board files for a prototype on my github account. User complacentsee/USB-Isolation. It’s just using the recommended layout and hasn’t been tested. I just ordered the prototype from OSHpark tonight and will test once sometime December.
The upstream side of the ADuM4160 gets power from the host device, in this case your computer. The downstream side of the ADuM4160 will need to get it’s power from the TinyG driver boards 5V rail.
Last night my TinyG was still working (FTDI was destroyed but uProcessor and drivers working) until I killed the 7805. Hopefully I can replace a couple components and get it running. The solder mask is damaged but the traces all look good.
MemberI think im going to use the Advanced Devices chip to make sure I’m isolated in the future. Shouldn’t be to big of a pain to make work as I just need to pull 5v and ground to the isolator. They are priced pretty competitively.
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