TIDUEY7 July   2021

 

  1.   Description
  2.   Resources
  3.   Features
  4.   Applications
  5.   5
  6. 1System Description
  7. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
      1. 2.2.1  System Control and Processing
      2. 2.2.2  Analog Front End
      3. 2.2.3  Input Voltage Monitoring: 5 V, 20 V, 40 V, and ±5 V
      4. 2.2.4  Bidirectional Current Sense: ±2 A
      5. 2.2.5  Unipolar Current Sense: 0.25 A to 1 A
      6. 2.2.6  TMP461-SP: Local and Remote Temperature Sensing
      7. 2.2.7  NTC Thermistor Temperature Sensing
      8. 2.2.8  Adjustable Voltage Source
      9. 2.2.9  Fixed Output Current Source
      10. 2.2.10 Adjustable 4-mA Current Source
      11. 2.2.11 Power Tree and Power Sequencing
    3. 2.3 Highlighted Products
      1. 2.3.1  MSP430FR5969-SP
      2. 2.3.2  ADC128S102QML-SP
      3. 2.3.3  DAC121S101QML-SP
      4. 2.3.4  LMP7704-SP
      5. 2.3.5  INA901-SP
      6. 2.3.6  LM4050QML-SP
      7. 2.3.7  LM158QML-SP
      8. 2.3.8  LM139QML-SP
      9. 2.3.9  TMP461-SP
      10. 2.3.10 TPS7A4501-SP
      11. 2.3.11 TPS7H2201-SP
  8. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Required Hardware and Software
      1. 3.1.1 Hardware
      2. 3.1.2 Software
    2. 3.2 Test Setup
      1. 3.2.1 Voltage Monitor Test Setup
      2. 3.2.2 Current Monitor Test Setup
    3. 3.3 Test Results
      1. 3.3.1 Voltage Measurement - Noise Floor Results
      2. 3.3.2 Voltage Measurement - Linearity Results
      3. 3.3.3 Current Measurement - Noise Floor Results
      4. 3.3.4 Current Measurement - Linearity Results
      5. 3.3.5 Analog Outputs
  9. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 BOM
    2. 4.2 Documentation Support
    3. 4.3 Support Resources
    4. 4.4 Trademarks
  10. 5About the Author

3.3.5 Analog Outputs

By default the software is setup to sweep the voltage from 0 to max resulting in the scope shot in Figure 3-16. The output of the DAC121S101QML-SP goes from 0–2.5 V, and the LMP7704-SP is setup to have a gain of 2 V/V which results in a 0- to 5-V output.

GUID-20210415-CA0I-0QPJ-P281-Q9DQQ3XKX4MV-low.png Figure 3-16 Adjustable Voltage Source
GUID-978AB04A-ABD7-4265-A855-22C17D0FE70F-low.pngFigure 3-17 Constant Current Output Test Setup (7.5 V Applied)
GUID-958628D1-4628-4D4C-8FA1-8E1BDB97E503-low.pngFigure 3-19 Constant Current Output Test Setup (9 V Applied)
GUID-787478D9-21C9-44F6-8E5B-E3B9C7B4E31E-low.pngFigure 3-18 Constant Current Output Test Setup (8 V Applied)
GUID-61D37106-3353-402D-A6A5-D2AC42AFBD25-low.png Figure 3-20 Adjustable 4-mA Current Source 6.5-V Input