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

2.3.2 External Analog Speed Input

The speed input (DIN) to the device can also be provided through an external potentiometer. Once connected to the device, set "Speed pin configuration" under Interface Configuration to accept analog voltage to control motor speed. Set control via I2C to Disabled.

Use J13 to select between Analog input to PWM/DC pin. Rotate R41 to different speeds.

MC121EVM Option to change PWM/DC input to accept analog voltage Figure 2-6 Option to change PWM/DC input to accept analog voltage
MC121EVM Disable option for control Via I2C Figure 2-7 Disable option for control Via I2C
MC121EVM External Analog Speed control input to PWM/DC pin Figure 2-8 External Analog Speed control input to PWM/DC pin