TIDUF19 September   2022 ADS1282-SP

 

  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 Rset, Rref, and Gain Calculation
      2. 2.2.2 Analog Multiplexer Effect
    3. 2.3 Highlighted Products
      1. 2.3.1 ADS1282-SP
      2. 2.3.2 LMP7704-SP
      3. 2.3.3 TPS7A4501-SP
      4.      16
  8. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
    2. 3.2 Software Requirements
    3. 3.3 Test Setup
    4. 3.4 Test Results
  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

1 System Description

This reference design demonstrates a temperature sensing system that can measure temperature at 10 different locations. The system consists of TIDA-060042 and ADS1282EVM-PDK. TIDA-060042 is a Resistance Temperature Detector (RTD) board that connects 10 RTDs in a series. Shown in Figure 2-1, each of the RTD outputs a differential signal proportional to its resistance, and is captured by ADS1282EVM-PDK for temperature calculation. Due to the large input impedance of ADS1282-SP, the accuracy of the measurement is greater than 99.93% without calibration or using any buffers. Compare to traditional space temperature measurement circuits, this circuit is not only more flexible and accurate, but also has smaller size and lower cost for reducing use of buffers.