SDAA201 January   2026 MSPM0C1104

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1 System Introduction
  5. 2 Hardware Implementation
    1. 2.1 Power Supply
    2. 2.2 Voltage sensing
    3. 2.3 Current Inputs
  6. 3 Software Introduction
    1. 3.1 Peripherals Setup
    2. 3.2 Metrology Computation Engine
    3. 3.3 Foreground Process
    4. 3.4 Background Process
    5. 3.5 PC GUI Introduction
  7. 4 Demo Board Quick Start and Calibration
    1. 4.1 Evaluation Board Introduction
    2. 4.2 Scaling Factor Calibration
  8. 5 Test Results
  9. 6References

Abstract

This application note implements a single-phase AC power energy measurement subsystem using a low cost MCU MSPM0C1104 and an external OPA TLV9062.(Or just used a MSPM0L1304 include two internal OPAs, but not tested in this document) It uses a shunt sensor for current sensing and resistors divider for voltage sensing. This design achieves <2% accuracy test based on current input range (340mA~3.44A) with 4kHz sampling rate and uses a TI Arm® Cortex®-M0+ low cost microcontroller for calculating the metrology parameters.

Key features supported in this design:

  • Low cost solution
  • Single-phase two-wire (1P2W) <2% shunt metrology subsystem for power monitor
  • Root mean square (RMS) current and voltage, Active, reactive and apparent power, power factor calculation
  • Energy metrology software with pulsed outputs to a reference test system including results displaying on a Microsoft® Windows® PC GUI

Software and evaluation board design resources can be download here[Downloadlink]