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

2.4 MSP430FR2355 Microcontroller

The MC121EVM includes a MSP430FR2355 low-power MCU, shown in Figure below, to communicate via I2C with the MC121 or MC121-Q1 device.

To program the MSP430FR2355, an external MSP430 programmer must be connected to the Spy-Bi-Wire (SBW) interface connector J4. Many MSP430 LaunchPads™ provide an onboard eZ-FET Debug Probe that can be jumper-wired to the MC121EVM to flash the firmware into the onboard MSP430FR2355 microcontroller.

The user can use the Reset (RST) button S4 at any time to restart the MCU program.

The 32-pin shunt jumper bridge J6 ties all signals between the microcontroller and the EVM circuits.

MC121EVM MSP430FR2355 MCU interface and debug Figure 2-10 MSP430FR2355 MCU interface and debug