TMC2208 V1.2 Sillent Stepper Motor Driver 3D Printer Module

Detail TMC2208 V1.2 Sillent Stepper Motor Driver 3D Printer Module

Features
UART configuration interface (9600-500k Baud)
Power tube built-in drive current 1.4A ,peak current 2A, voltage range 4.75V-36V
Up to 256 native microsteps (without interpolation)
CoolStep ™ current dynamic adjustment technology, can save 70% of the energy
stealthChop2 - faster motor acceleration/deceleration than stealthChop
dcStep ™, stallGuard2 ™ stall detection technology
Automatic stealthChop and spreadCycle switchover depending on velocity
Hardware compatible with StepStick and Pololu A4988 Stepper Driver
Components on bottom PCB side for better heat emission
Automatic standby current reduction
SteaClthhop mute technology
spreadCycle - highly dynamic motor control chopper

​ The TMC2208 outputs continuous motor current up to 1.4A and peak current up to 2A. Therefore, the reference voltage of the driver module should not exceed 1V. At the same time, the driver module must be dissipated, otherwise it will affect the life of the driver module.

The best way to set the motor current is by measuring the voltage on the Vref pin (0…2.5V) and adjusting the voltage with the potentiometer. The maximum settable motor current is 1.77A RMS (0.11Ohm sense resistors), but the SilentStepSticks can only be used up to 1.2A RMS.
Irms = (Vref * 1.77A) / 2.5V = Vref * 0.71
Vref = (Irms * 2.5V) / 1.77A = Irms * 1.41 = Imax
Vref -> Voltage on Vref pin
Irms -> RMS (Root Mean Square) current per phase (Irms = Imax / 1.41)
Imax -> Maximum current per phase (Imax = Irms * 1.41)

​ 1. Vref measures Gnd and the voltage at the middle of the potentiometer.
​ 2. Do not connect the motor when measuring the voltage, otherwise it is easy to burn the driver.
​ 3. Power should be connected when measuring voltage, do not just connect USB power supply.
​ 4. Please pay special attention to directions!

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