TMC7300 Example Script

Trinamic recently launched a new line of battery-powered motor driver chips. The TMC7300 is one of them, capable of driving 1 DC motor up to 2A, or 2 DC motors up to 2.4A (peak). In this post, I’ll show you a small example script to drive a DC motor using the TMC7300-EVAL-KIT.

First, I assemble the Evaluation Kit by using the Eselsbrücke connector board to connect the TMC7300-EVAL board with the Landungsbrücke interface board. Second, I connect a motor to the evaluation board. Finally, I plug in the USB-C cable for direct access with my computer using the TMCL-IDE.

With the setup complete, I can tune the TMC7300 DC driver IC and immediately see the motor’s behavior in real life, and in the graphical user interface.

Using the TMCL-IDE, I create a short example script that moves the DC motor as shown in figure 1. The motor PWM goes from 0% duty cycle to 30%, to 50% and back to zero. Afterwards, it shows the same values in negative direction.

Below is the script I used.

#module 1 COM16/USB/id1/Landungsbruecke [Landungsbruecke]

CALC ADD, 1               // Add 1 to accu
STOA 0, 0                    // Store local variable to accumulator

SAP 7, 0, 0, 1          // Deactivate Standby of TMC7300

Loop:
            SAP 0, 0, 30, 1     // Set duty cycle for Motor 1 to 30%
            WAIT TICKS, 0, 1000 // Wait 1 second
            SAP 0, 0, 50, 1     // Set duty cycle for Motor 1 to 50%
            WAIT TICKS, 0, 1000 // Wait 1 second
            SAP 0, 0, 30, 1     // Set duty cycle for Motor 1 to 30%
            WAIT TICKS, 0, 1000 // Wait 1 second
            SAP 0, 0, 0, 1      // Set duty cycle for Motor 1 to 0%
            WAIT TICKS, 0, 1000 // Wait 1 second
            SAP 0, 0, -30, 1        // Set duty cycle for Motor 1 to -30%
            WAIT TICKS, 0, 1000 // Wait 1 second
            SAP 0, 0, -50, 1        // Set duty cycle for Motor 1 to -50%
            WAIT TICKS, 0, 1000 // Wait 1 second
            SAP 0, 0, -30, 1        // Set duty cycle for Motor 1 to -30%
            WAIT TICKS, 0, 1000 // Wait 1 second
            SAP 0, 0, 0, 1      // Set duty cycle for Motor 1 to 0%
            WAIT TICKS, 0, 1000 // Wait 1 second
     
            CALC ADD, 1    // Add 1 to accu
            STOA   0, 0      // Store value to accumulator
            COMP 100       // <----- Amount of loops set here
            JC LE, Loop      // Jump to label Loop

SAP 7, 0, 1, 1          // Activate Standby of TMC7300

STOP

And that’s all there is to it. For more information on the TMC7300, please visit the TMC7300 product page here.