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

2.1 Quick Setup – Motor Run Mode

The MC121EVM requires a power supply source with a recommended operating range from 4.5V to 35V. To set up and power the EVM, and to run the motor installed in the motor PCB, 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 MC121EVM using J1.
  2. Connect the DC power supply to VBAT/VM and PGND on connector J7. Do not turn on the power supply.
    1. Connect to VBAT to enable reverse polarity protection.
    2. 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 in J19 between Pin 2 and Pin 3 to set the ADC measurement to unipolar output for GUI current plot.
  7. Remove the Jumper on J16 to disable the connection between onboard 12V boost supply and VM since an external power supply is needed to run the motor.
  8. Turn on the motor power supply.
  9. Launch MotorStudio GUI to connect to the MC121 or MC121-Q1.
MC121EVM Default jumper configuration of the MC121EVM Figure 2-1 Default jumper configuration of the MC121EVM