TIDUF27A February   2025  – March 2025 AMC131M03 , MSPM0G1507

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Key System Specifications
    2. 1.2 End Equipment
    3. 1.3 Electricity Meter
    4. 1.4 Power Quality Meter, Power Quality Analyzer
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
      1. 2.2.1 Voltage Measurement Analog Front End
      2. 2.2.2 Analog Front End for Current Measurement
      3. 2.2.3 XDS110 Emulator
      4. 2.2.4 Bluetooth® Data Transmission
      5. 2.2.5 Bluetooth® Connection Between Two Modules
      6. 2.2.6 Bluetooth® to UART Connection
      7. 2.2.7 Magnetic Tamper Detection With TMAG5273 Linear 3D Hall-Effect Sensor
    3. 2.3 Highlighted Products
      1. 2.3.1  MSPM0G3507
      2. 2.3.2  AMC131M03
      3. 2.3.3  CDC6C
      4. 2.3.4  RES60A-Q1
      5. 2.3.5  TPS3702
      6. 2.3.6  TPD4E05U06
      7. 2.3.7  ISOUSB111
      8. 2.3.8  LMK1C1104
      9. 2.3.9  MSP432E401Y
      10. 2.3.10 TPS709
      11. 2.3.11 TMAG5273
  9. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
      1. 3.1.1 Clocking System
        1. 3.1.1.1 BAW Oscillator
        2. 3.1.1.2 Crystal Oscillator
        3. 3.1.1.3 PWM
        4. 3.1.1.4 Clock Buffers
      2. 3.1.2 SPI Bus Configuration
      3. 3.1.3 Jumper Settings for LED and UART
    2. 3.2 Software Requirements
      1. 3.2.1 UART for PC GUI Communication
      2. 3.2.2 Direct Memory Access (DMA)
      3. 3.2.3 ADC Setup
      4. 3.2.4 Calibration
    3. 3.3 Test Setup
      1. 3.3.1 Connections to the Test Setup
      2. 3.3.2 Power Supply Options and Jumper Settings
        1.       51
      3. 3.3.3 Cautions and Warnings
    4. 3.4 Test Results
      1. 3.4.1 Electricity Meter Metrology Accuracy Results
      2. 3.4.2 Radiated Emissions Performance
  10. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 BOM
      3. 4.1.3 PCB Layout Recommendations
        1. 4.1.3.1 Layout Prints
    2. 4.2 Tools and Software
    3. 4.3 Documentation Support
    4. 4.4 Support Resources
    5. 4.5 Trademarks
  11. 5About the Author
  12. 6Revision History

1.3 Electricity Meter

Utility providers and customers are driving the need for more features from electricity meters. As the accuracy requirements and amount of processing expected from electricity meters rapidly increase, it becomes more and more difficult to solve these issues with a single metrology system-on-chip (SoC).

A common answer is to utilize a standalone ADC with a host microcontroller (MCU) to simultaneously overcome the processing and accuracy limitations of electricity meter SoCs. With this dual-chip approach system designers can mix and match the most appropriate devices for ADC and for MCU, and optimize the system for cost or performance. Using an accurate state-of-the-art standalone ADC with integrated power and data isolation, such as the AMC131M03, has the following advantages:

  • Enables meeting the most stringent of accuracy requirements
  • Enables meeting minimum sample rate requirements (without compromising on accuracy) that is sometimes not obtainable with application-specific products or metrology SoCs
  • Enables flexibility in selecting the host MCU, as the device only has to meet the application requirements. These requirements include the following:
    • Processing capability in MIPS
    • Minimum RAM and flash area
    • The number of communications modules (for example, serial-peripheral interface (SPI), universal asynchronous receiver-transmitter (UART), and I2C), DMA and CRC modules and some other peripherals, like security features for providing meter data integrity and security

To properly measure energy consumption, voltage and current sensors translate Mains voltage and current to a voltage range that an ADC can sense. When a multiphase power distribution system is used, it is necessary for the current sensors to be isolated from phase-to-phase, so the sensors can properly detect the current drawn from the two or three or four different lines (when Neutral is measured) without damaging the ADCs. This design uses either 2 or 3 or 4 cost-effective shunt sensors, which are immune to magnetic tampering, and enables the implementation of electricity meters for three-phase STAR configuration with optional Neutral line measurement.