TMC2225 stepper motor driver

The TMC2225 is a Step/Dir Driver for Two-Phase Bipolar Stepper Motors up to 2A peak - StealthChop™ 
for Quiet Movement - UART Interface Option. 

This chip has a maximum current of 2A and is also equipped with a UART interface. It uses a 1k ohm resistor to separate TX and RX, and can achieve 256 subdivisions through communication. Has the ability to drive quietly.

My original intention of making this driver board is that the DRV8825 driver available on the market is difficult to use. The main reason is that the adjustable potentiometer on it is relatively cheap and easy to break. It is simply expensive and difficult to use, so I was angry and made my own driver. In view of the DRV8825 The driver sound is loud, so choose a chip that can drive silently.

The performance of this chip is much higher than DRV8825

This board has been designed twice. In the first version, because there was no symmetrical design, one channel could be connected and the other could not be connected. In the second version, both channels could be connected. An LED light was designed to report errors. If the chip is wrong, the light will On, lead out a solder pad for dialog, and designed a four-way dial switch, which can be used for side dialing or direct dialing. In the actual photo, due to testing, there is no welding, so four pin headers are used, and the four-way dialing switch is soldered. It would be even more perfect, given to EN SPREAD, M1, and M2 respectively.

Driving method: Give a 10KHZ PWM wave to STEP, VCC, GND and power supply, turn down M1 and M2, and connect the stepper motor.