TMC2209

I am trying to make a compilation of information about TMC2209 stepstick drivers that are available out there.

There seems to be a great variation of how the UART pins are brought out to the edge connectors of the stepstick boards, and I would like to get some clarification on this matter.

On-chip 5V regulator

Please note that there is an internal 5V linear regulator, on the chip itself, and the about 20mA that the logic on the chip uses, will cause the following heat dissipation at different stepper supply voltages[1].

• 0.1W @ VM=12V
• 0.3W @ VM=24V
• 0.6W @ VM=36V
• 0.8W @ VM=45V

So a heat sink, that can help remove this heat from the board/chip, should always be used.

Good Heat Sink sizes. The bigger the better:

• Heatsink 9 x 9 x 12mm [2]
• Heatsink 14,5 x 15 x 13mm [3]

Hardware

Watterott

Design files: https://github.com/watterott/SilentStepStick

Versions: V2.0

Pictures:

Pinout details:

Panucatt

Design files: http://panucattdevices.freshdesk.com/support/solutions/articles/1000285641-new-sd2209-drivers

Versions: V1.0

Pictures:

Pinout details:

BTT

Design files: Ver 1.1 Github, Ver 1.2 Github

Versions: V1.1, V1.2

Pictures:

Pinout details: for V1.1 and V1.2

Fysetec

Design files: https://wiki.fysetc.com/Silent2209/

Versions: V2.1, V3.0

Pictures:

Pinout details:

I am not quite sure what to show here, as I find the fysetec wiki page a little confusing. So please go and see for yourself.

And once you have tested an actual board, please update this page.

Lerdge

Design files: hmmm...

Versions: V1.0

Pictures:

Pinout details:

makerbase

Design files: https://github.com/makerbase-mks/MKS-TMC2209

Versions: V1.0

Pictures:

Pinout details:

Firmware

Marlin 2.0.x

Below are listed some controller boards, and pin definition files, and default pins used for UART communication with the TMC2209 stepper drivers

Mega RAMPS

definitions in file: github \Marlin-2.0.x\Marlin\src\pins\ramps\pins_RAMPS.h

   #define X_SERIAL_TX_PIN  40
   #define X_SERIAL_RX_PIN  63

   #define Y_SERIAL_TX_PIN  59
   #define Y_SERIAL_RX_PIN  64

   #define Z_SERIAL_TX_PIN  42
   #define Z_SERIAL_RX_PIN  65

   #define E0_SERIAL_TX_PIN 44
   #define E0_SERIAL_RX_PIN 66

Here is a forum entry about how to do a Single Pin SoftwareSerial for each stepper driver using the Arduino Mega, with a RAMPS board Reprap Forum thread

   #define X_SERIAL_TX_PIN  63
   #define X_SERIAL_RX_PIN  63

   #define Y_SERIAL_TX_PIN  64
   #define Y_SERIAL_RX_PIN  64

   #define Z_SERIAL_TX_PIN  65
   #define Z_SERIAL_RX_PIN  65

   #define E0_SERIAL_TX_PIN 66
   #define E0_SERIAL_RX_PIN 66

Notes about Software serial pins on Arduino Mega pins: 

Issue is software serial and interrupts
the RX pins needs to be a 'change interrupt capable pin' on the mega

"Not all pins on the Mega and Mega 2560 support change interrupts, so only the following can be used for RX: 10, 11, 12, 13, 14, 15, 50, 51, 52, 53, A8 (62), A9 (63), A10 (64), A11 (65), A12 (66), A13 (67), A14 (68), A15 (69)."

There is a difference between 'General Interrupt pins' (on the Arduino Mega) that can be used 
via attactInterrupt() in Arduino) - and then the pins where the 
Software Serial library can deal with "Change State" interrupts.

So there is no need to use pins 2,3, 18,19 or 20,21 for Software Serial. 

See also: Forum thread discussion about 2209 and software serial

Re-ARM RAMPS

definition in file: github \Marlin-2.0.x\Marlin\src\pins\lpc1768\pins_RAMPS_RE_ARM.h

    #define X_SERIAL_TX_PIN  P0_01   // Mega:D21  I2C-SCL
    #define X_SERIAL_RX_PIN  P0_01 

    #define Y_SERIAL_TX_PIN  P0_00   // Mega:D20  I2C-SDA
    #define Y_SERIAL_RX_PIN  P0_00

    #define Z_SERIAL_TX_PIN  P2_13   // Mega:D34 - RAMPS:E2-Dir
    #define Z_SERIAL_RX_PIN  P2_13
  
    #define E0_SERIAL_TX_PIN P2_08   // Mega:D36 - RAMPS:E2-step
    #define E0_SERIAL_RX_PIN P2_08