I am switching out a Pololu A4988 for a TMC2209, and I would be grateful if someone could help me understand the requirements of the TMC2209 chip vs. the breakout board from Watterrott, which already includes some of the required component changes. This is not for use in a 3D printer, and there is very little guidance available (this thread contains some information, but did not answer my question).
I would like to use the TMC2209 in 1/16 StealthChop mode. Do I need to tie the SPRD pin to ground to activate this mode? (This is the MS3 pin on the A4988, and needs to be tied high for 1/16 mode). Also, can I leave the PDN and UART pins floating on the TMC2209? Finally, should I include Schottky diodes as recommended here?
I am implementing the Enable pin the same as I did on the A4988... that is, connected to a digital pin on the Arduino, and the code sets the pin low when the motor is in use, high when it is idle. Here is a picture of my current setup. Thank you for your help!
Thanks Railroader. Sorry, I should have said the parts in question are pictured here. 12V feeds into a regulator which powers both the minimal Arduino and the TMC2209. I'm just not clear on what to do with the pins that deviate from the A4988. The TMC2209 claims to be a drop in replacement, but I'm not entirely sure that is the case. For example, on my A4988 circuit (which works fine, it's just too loud), RST is tied to SLP (PDN and UART on 2209), and MS3 is tied high (SPRD on 2209). It sounds to me like SPRD needs to be tied to ground for StealthChop, and PDN may also need to go to ground to activate "automatic standstill current reduction." Here is the schematic for the Watterrott breakout. There are some jumper pads related to PDN and UART I don't quite understand. I appreciate your help! SilentStepStick-TMC2209_v20.pdf (61.5 KB)
Sorry Railroader, that's not helpful. I provided links to datasheets, schematics, and pinouts in my post, so clearly I still have questions after referencing those materials. I'll see if someone else chimes in.
I had no idea to be short or nosy. Your link shows the names of the pins but there's more to find.
Digging deeper, using this link
and downloading the first data sheet, up to the left, I find much more, an explanation how to use the device, its pins and functions.
Let's see if it copies. No it doesn't.
Follow the link above and download the first suggested data sheet, in .PDF. Then go down a bit and look for section 2.2 Signal Descriptions TMC220.
