@cvmichael said in TMC2660 on stepper channels 10 and 11:
"ENN - connect to ENN on the expansion bus" - what pins? I only see "En 10" and "En 11" on the CONN_LCD, but I don't see any 10, 11 on the expansion bus.
I mean the expansion bus on the 50-pin connector. You will need to tap into that bus, e.g. by clamping a 3rd IDC socket on the 50-way ribbon cable. Or you could have a couple of 50-way connectors on your expansion board, then use a short ribbon cable to connect the Duet to your expansion board and another ribbon cable to connect the DueX to your expansion board.
"CSN - connect to the corresponding ENABLE pin on CONN_LCD" - is this the "En 10" and "En 11" ?
Yes.
What is the "Stop 10" and "Stop 11" ? pins 3 & 4 on the CONN_LCD, is this for the CSN ?
No, those are for endstop switches.
"SDI, SDO, SCK - connect to SPI1_MOSI, SPI1_MISO and SPI_SCK on the expansion bus" - I already have a Duex5, and I don't see any pins for the SPI1 (I see quite a few for SPI0 though). Does this mean that I will have to sodder wires in the back of the Duet PCB to bring the SPI1 to my motor driver PCB?
See my comments on ENN above.
Since I want to make a PCB for both channels 10 & 11, I assume SPI is connected in parallel, but CSN is separate?
All the control inputs are in parallel except for CSN, STEP and DIR.
I created a schematic, if you have some time to take a look at it, and let me know if you see any mistakes:
The sense resistors should be 0R05 not 0R1
VCC_IO should be +3.3V not +5V.
There should be a 100uF electrolytic cap on the +24V supply close to each driver
We have 1nF capacitors for each output to ground to help with EMI and immunity to inductive spikes
See the Duet schematic at https://github.com/T3P3/Duet/blob/master/Duet2/Duet2v1.04/DuetWifiv1.04a_Schematic.pdf for how we connect the TMC2660s. The resistors shown as 0R051 are 0R050 in recent production.