TIDUF25 june   2023 ADS131M08 , MSPM0G1507

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 End Equipment
    2. 1.2 Electricity Meter
    3. 1.3 Power Quality Meter, Power Quality Analyzer
    4. 1.4 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
      1. 2.2.1 External Supply Voltage Supervisor (SVS) With TPS3840
      2. 2.2.2 Magnetic Tamper Detection With TMAG5273 Linear 3D Hall-Effect Sensor
      3. 2.2.3 Analog Inputs
        1. 2.2.3.1 Voltage Measurement Analog Front End
        2. 2.2.3.2 Current Measurement Analog Front End
    3. 2.3 Highlighted Products
      1. 2.3.1  ADS131M08
      2. 2.3.2  MSPM0G3507
      3. 2.3.3  MSP430FR4131 for Driving Segmented LCD Displays
      4. 2.3.4  TPS3840
      5. 2.3.5  THVD1400
      6. 2.3.6  ISO6731
      7. 2.3.7  ISO6720
      8. 2.3.8  TRS3232E
      9. 2.3.9  TPS709
      10. 2.3.10 TMAG5273
  9. 3System Design Theory
    1. 3.1  How to Implement Software for Metrology Testing
    2. 3.2  Clocking System
    3. 3.3  UART Setup for GUI Communication
    4. 3.4  Real-Time Clock (RTC)
    5. 3.5  LCD Controller in MSP430FR4131
    6. 3.6  Direct Memory Access (DMA)
    7. 3.7  ADC Setup
    8. 3.8  Foreground Process
      1. 3.8.1 Formulas
    9. 3.9  Background Process
    10. 3.10 Software Function per_sample_dsp()
      1. 3.10.1 Voltage and Current Signals
      2. 3.10.2 Frequency Measurement and Cycle Tracking
    11. 3.11 LED Pulse Generation
    12. 3.12 Phase Compensation
  10. 4Hardware, Software, Testing Requirements, and Test Results
    1. 4.1 Required Hardware and Software
      1. 4.1.1 Hardware
      2. 4.1.2 Cautions and Warnings
    2. 4.2 Test Setup
      1. 4.2.1  Connecting the TIDA-010243 to the Metering Test Equipment
      2. 4.2.2  Power Supply Options and Jumper Settings
      3. 4.2.3  Electricity Meter Metrology Accuracy Testing
      4. 4.2.4  Viewing Metrology Readings and Calibration
        1. 4.2.4.1 Viewing Results From LCD
        2. 4.2.4.2 Calibrating and Viewing Results From PC
      5. 4.2.5  Calibration and FLASH Settings for MSPM0+ MCU
      6. 4.2.6  Gain Calibration
      7. 4.2.7  Voltage and Current Gain Calibration
      8. 4.2.8  Active Power Gain Calibration
      9. 4.2.9  Offset Calibration
      10. 4.2.10 Phase Calibration
      11. 4.2.11 Software Code Example
    3. 4.3 Test Results
      1. 4.3.1 SVS Functionality Testing
      2. 4.3.2 Electricity Meter Metrology Accuracy Results
  11. 5Design and Documentation Support
    1. 5.1 Design Files
      1. 5.1.1 Schematics
      2. 5.1.2 BOM
      3. 5.1.3 PCB Layout Recommendations
      4. 5.1.4 Layout Prints
      5. 5.1.5 Gerber Files
    2. 5.2 Tools and Software
    3. 5.3 Documentation Support
    4. 5.4 Support Resources
    5. 5.5 Trademarks
  12. 6About the Author

2.3.2 MSPM0G3507

The MSPM0G device family integrates an Arm® 32-bit Cortex®-M0+ CPU with memory protection unit, clock frequency up to 80 MHz and two SPIs, one of those supporting up to 32Mbps. Other relevant peripherals for running Energy Calculations are the Real Time Clock (RTC) with calendar function, CRC-16 or CRC-32 HW module, four Universal Asynchronous Receiver Transmitters (UARTs), two I2Cs with 1Mbps and up to 60 GPIOs.

GUID-20230605-SS0I-3S8T-TPDK-6BZJ4HHT3CRF-low.svgFigure 2-6 MSPM0G3507 Functional Block Diagram

The MSPM0+ MCU in this design retrieves voltage and current samples from the ADS131M08 device and calculates metrology parameters. In addition, the device also keeps track of time with the RTC module, and uses one of the UART interfaces to communicate to a PC GUI using either the isolated RS-232 or isolated RS-485 circuit of the board or sends the calculated parameters to be displayed on the LCD to an external MSP430FR4131 thru a 2nd UART link.

The CRC16 module of the MSPM0+ MCU is also used to accelerate the CRC calculations that are done to verify the integrity of the ADC packet sent by the ADS131M08 device.

Main features of MSPM0G3507 are the extended temperature range: –40°C up to 125°C; the wide supply voltage range: 1.62 V to 3.6 V; and the integrated 128KB of flash memory with built-in error correction code (ECC) and 32KB of ECC protected SRAM with hardware parity.

The pin-compatible MSPM0G1107 device, featuring –40°C up to 105°C range and without the hardware math accelerator (MATHACL) and the AES modules can be used, if the application targets lower system cost and does not require these two peripherals.