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

2 System Overview

Table 2-1 details the system specifications of TIDA-060042, the RTD board, which is designed to connect to ADS1282EVM-PDK for temperature measurement.

Table 2-1 TIDA-060042 System Specification
Net name Description Value Unit Error [%]
Power Supply 5V_in RTD board power supply 5 V N/A
Input Rref Sets the Vref for ADS1282EVM 4.76 for IRTD(1) ≈ 0.5 mA kOhm 0.05%
2.18 for IRTD ≈ 1 mA
1.1 for IRTD ≈ 1.5 mA
Rset Sets the current at all RTDs and Rref 1.5k for IRTD ≈ 0.5 mA Ohm 0.05%
750 for IRTD ≈ 1 mA
500 for IRTD ≈ 1.5 mA
RTD1 to RTD10 10 RTDs located at different locations 0 to 135 Ohm 0.05%
Output ADCin1 Voltage across RTD1 0 to Vref(1)/(2*gain(1)) V 0.1%
ADCin2 Voltage across RTD2 0 to Vref/(2*gain) V 0.1%
1.

Current of all RTDs, Rset, and Rref as shown in Figure 2-1

1.

Vref is the voltage across Rref in Figure 2-1

1.

ADS1282-SP programable gain amplifier (PGA) gain, which could be set to 1, 2, 4, 8, 16, 32, and 64