TIDUF98 October   2024

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 End Equipment
      1. 1.1.1 Electricity Meter
    2. 1.2 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Highlighted Products
      1. 2.2.1 ADS131M03
      2. 2.2.2 MSPM0L2228
      3. 2.2.3 THVD1400
      4. 2.2.4 ISO6731
      5. 2.2.5 DRV5032
    3. 2.3 Design Considerations
      1. 2.3.1 Design Hardware Implementation
        1. 2.3.1.1 Analog Inputs
          1. 2.3.1.1.1 Voltage Measurement Analog Front End
          2. 2.3.1.1.2 Current Measurement Analog Front End
      2. 2.3.2 Energy Metrology Software
        1. 2.3.2.1 Software Architecture
        2. 2.3.2.2 Setup
          1. 2.3.2.2.1 Clocking Scheme
          2. 2.3.2.2.2 SPI
          3. 2.3.2.2.3 UART Setup for GUI Communication
          4. 2.3.2.2.4 Real-Time Clock
          5. 2.3.2.2.5 LCD Controller
          6. 2.3.2.2.6 Direct Memory Access
    4. 2.4 Hardware, Software, Testing Requirements, and Test Results
      1. 2.4.1 Required Hardware and Software
        1. 2.4.1.1 Cautions and Warnings
        2. 2.4.1.2 Hardware
          1. 2.4.1.2.1 Connections to the Test Setup
          2. 2.4.1.2.2 Power Supply Options and Jumper Settings
        3. 2.4.1.3 Calibration
      2. 2.4.2 Testing and Results
        1. 2.4.2.1 Test Setup
          1. 2.4.2.1.1 Viewing Metrology Readings and Calibration
            1. 2.4.2.1.1.1 Viewing Results From LCD
            2. 2.4.2.1.1.2 Viewing Results From PC GUI
        2. 2.4.2.2 Electricity Meter Metrology Accuracy Testing
        3. 2.4.2.3 Electricity Meter Metrology Accuracy Results
  9. 3Design Files
    1. 3.1 Schematics
    2. 3.2 Bill of Materials
    3. 3.3 PCB Layout Recommendations
      1. 3.3.1 Layout Prints
    4. 3.4 Altium Project
    5. 3.5 Gerber Files
    6. 3.6 Assembly Drawings
  10. 4Related Documentation
    1. 4.1 Trademarks
  11. 5About the Authors
Power Supply Options and Jumper Settings

The MSPM0L228 and ADS131M043 are powered from an external power supply by connecting the 3.3V and GND to header J4.

Note: The headers with (WARNING) text in the MAIN FUNCTIONALITY column are not isolated, so do not use measuring equipment there (especially if the system is referenced with respect to the line) when running off the Mains. This applies, unless either isolators external to the board of the design are used to connect at the headers, if the equipment is battery powered and does not connect to Mains, or if AC mains is isolated.
Table 2-2 Header Names and Jumper Settings
Header or Header Option Name Type Main Functionality Valid Use-Case Comments
J1 10-pin header Programming of MSPM0L2228(WARNING) Apply 10-pin cable from XDS110 Debugger on a TI Launch Pad to flash MSPM0+ MCU.

TI MSPM0G3507 or MSPM0L1306 LaunchPads provide XDS110 debug functionality for external targets / TI MCU devices. Since this header and the XDS110 are not isolated, do not connect to this header when running off Mains and Mains is not isolated.

J2 2-pin

Terminal block

Line and Neutral connections (WARNING) Connect Line and Neutral Connect High Voltage for Line and Neutral from Test equipment here
J4 2-pin jumper header External power supply(WARNING) Header with GND and 3V3 pins, marked with text. Used for testing, non-isolated 3V3 and GND can be also provided from TI LaunchPad.
J5, J6 1-pin headers Connections for CR2032 battery backup (WARNING) VBAT and GND. These are two pins: GND and VBAT, so a battery can be soldered to the PCB.
J11 10-pin 2-row connector JTAG: MSPM0+ programming header (WARNING) Connect an external XDS110 debugger to this connector to program the MSPM0L2228 MCU.
J3 2-pin header Active energy pulses (WARNING) Probe here for active energy pulses based on the shunt active power readings. This header has two pins: GND and ACT, which is where the active energy pulses are actually output. This header is not isolated from AC mains, so do not connect measuring equipment here (especially when referencing the system from line).
J12 2-pin header Reactive energy pulses (WARNING) Probe here for active energy pulses based on the shunt active power reading. This header has two pins: GND and REACT, which is where the reactive energy pulses are actually output. This header is not isolated from AC mains, so do not connect measuring equipment here (especially when referencing the system from line).
J15 4-pin terminal block RS-485 connection Connection point for RS-485 To view the GUI using RS-485, connect the USB to RS-485 adapter here. 3V3 must be provided externally on pin 4 of this header. Pin 2 of this header is the RS-485 ground, pin 3 is the B bus I/O line, and pin 4 is the A bus I/O line.