Hello there,
I'm looking for an easy way to switch off the driver TMC 2209 with the 2 pin on the top of the driver.
Thank you
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Are you dealing with a module with that chip on it or just the chip itself? What does the documentation say about pin 2?
By following this link https://wiki.fysetc.com/Silent2209/#v31
I found this
The PIN DIAG is on the LEFT of VREF if you look at the driver on the top.
At the end of the picture you can read on the pin DIAG this:
Diagnostic and StallGuard output. Hi level upon stall detection or driver error. Reset error condition by ENN=high.
Does it mean on the pin DIAG, if I give 5 volt, I can turn off the driver and If I give 0 volt the driver turns on?
Thank you
V3.1
Thank you. Maybe is it possible to use pins TX and RX but it seems to be more complicated
Hi,
If you read the pin description.
| Pin | Function |
|---|---|
| Power Supply | |
| GND | Ground |
| VM | Motor Supply Voltage |
| VIO | Logic Supply Voltage |
| Motor Outputs | |
| M1A | Motor Coil 1 |
| M1B | Motor Coil 1 |
| M2A | Motor Coil 2 |
| M2B | Motor Coil 2 |
| Control Inputs | |
| STEP | Step-Signal Input |
| DIR | Direction-Signal Input |
| TMC2209 | |
| EN | Enable Motor Outputs: GND=on, VIO=off |
| MS1 | Microstep resolution configuration (internal pull-down resistors) |
| MS2 | MS1: 00: ⅛, 01: ½, 10: ¼ 11: 1/16 For UART based configuration selection of UART Address 0…3 |
| SP | Chopper mode selection: Low/pin open=StealthChop, High=SpreadCycle |
| CLK | CLK input. Tie to GND using short wire for internal clock or supply external clock. |
| TX | UART TX, Connected to the PDN via a 1K resistor on board |
| RX | UART RX, Directly connected to the PDN |
| DIAG | Diagnostic and StallGuard output. Hi level upon stall detection or driver error. Reset error condition by ENN=high. |
| INDEX | Configurable index output. Provides index pulse. |
| VREF | Analog Reference Voltage |
You will find that DIAG is an output pin not an input pin.
Why do you want to "switch off" the stepper driver, or do you want to "disable it"
EN pin HIGH, disables the drive, EN pin LOW enables the drive.
Thanks.. Tom... 
For an art installation, I need to move my motor manually. To do this, the motor must not be powered. And when I decide to, I have to supply my motor. I want to turn on/off the driver directly from the Arduino or a switch.
Hi,
You need to check if "EN" pin, which as the table says,"Enable Motor Outputs: GND=on, VIO=off"
If you disable the outputs, that should let the stepper freewheel so you can manually move it.
Have you built your prototype?
If so try it.
If you haven't built anything yet, now is the time to do it.
Tom...
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Thank you sir. It's exactly what I needed. 
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