SLVUDM2 October   2025

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5.   5
  6. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  7. 2Hardware
    1. 2.1 Quick Setup – Motor Run Mode
    2. 2.2 Quick Setup – OTP Programming Mode
    3. 2.3 Hardware Overview
      1. 2.3.1 Motor PCB connection to MC121EVM
      2. 2.3.2 External Analog Speed Input
      3. 2.3.3 Onboard 12V Boost Circuit
    4. 2.4 MSP430FR2355 Microcontroller
  8. 3Software
    1. 3.1 EVM Firmware
    2. 3.2 GUI Installation
    3. 3.3 Getting Started With Motorstudio for MC121
  9. 4Hardware Design Files
    1. 4.1 Schematics
    2. 4.2 PCB Layouts
    3. 4.3 Bill of Materials (BOM)
  10. 5Additional Information
    1.     Trademarks

2.2 Quick Setup – OTP Programming Mode

The MC121EVM requires a power supply source with a recommended operating range from 8V to 35V in programming mode. To set up and power the EVM, and to program the One time Programmable (OTP) memory of the device, follow the sequence below:

  1. Connect the VM, GND, FG/RD, and PWM/DC pins of the MC121 or MC121-Q1 on the motor PCB (not included in the EVM) to the EVM using J1.

  2. Connect the DC power supply to VBAT/VM and PGND on connector J7. Do not turn on the power supply.

    a. Connect to VBAT to enable reverse polarity protection.

    b. To disable reverse-polarity protection, connect to VM.

  3. Select J3 to 5V_USB and J5 to 3V3COM to power MSP430 from USB power supply.

  4. Connect the EVM to the PC with a micro-USB cable.

  5. Set the jumper in J13 between Pin 1 and Pin 2 as shown in the image below to enable PWM/DC

    connection to MCU.

  6. Set the Jumper on J16 to enable connection between onboard 12V boost supply and VM if an

    external supply is not available to program the OTP memory of the MC121 or MC121-Q1.

  7. Launch MotorStudio GUI to connect and configure the MC121 or MC121-Q1.

  8. Disable Auto read all registers and Disable Auto read faults in the Fault tab in the MotorStudio GUI.

  9. In the Controls tab, Enable Control Via I2C and enter 0% in I2C speed control and click Set button to stop the motor.

  10. Configure the registers from the GUI for the desired performance and functionality of the motor.
  11. Set the lever switch SW1 to the right position from the default left position and gently press the S1 once to program the OTP memory.
MC121EVM Default Lever switch (SW1) configuration with OTP programming mode disabled Figure 2-2 Default Lever switch (SW1) configuration with OTP programming mode disabled