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UM3 TMC2208 Upgrade

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Posted (edited) · UM3 TMC2208 Upgrade

Hi all,


Just acquired a UM3 regular and looking to make some changes to it. I'm specifically interested in upgrading the drivers to TMC2208. I've only seen maybe 1-2 threads on this forum discussing that but without any guides. I'm somewhat experienced in EE and have no problem soldering QFNs or other small parts. However, there is only one shot at this, since if I connect something the wrong way, it will possibly fry the board. Has anyone here attempted to replace the allegro drivers with TMC2208? I've seen some aliexpress boards that offer TMC2208 drop in replacement for ultimakers, but I think that is for UM2 and I also don't trust aliexpress board designs. 


I know I can just get a newer duet or other board with TMC2208, but I'd like to preserve the Ultimaker LCD and camera functionality. I've found the schematic of UM3 here: https://github.com/Ultimaker/Ultimaker3/blob/master/PCB files/1548-I Ultimainboard/Schematics and layout pdf/Schematic Prints.PDF and here is a TMC2208 schematic for the driver: https://github.com/watterott/SilentStepStick/blob/master/hardware/SilentStepStick-TMC2208_v20.pdf


My understanding is that both drivers' pins are fully compatible, just some resistors/caps might need modifications. Is this correct? How would you go about setting the power to the 2208 driver? And I also read that you need to pre-program the driver before soldering it to put it in legacy mode? Is this true?

Any suggestions on how to go about this would be super helpful!

Edited by shai
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    • 2 weeks later...
    Posted · UM3 TMC2208 Upgrade

    So, I have gone ahead and done the hard work of figuring out what needs to change. This should work. I will update this thread after I have done some testing!



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