Analog Front End (AFE) for Sensing Temperature in Smart Grid Applications Using RTD Reference Design
This reference design enables up to 4 Resistor Temperature Detectors (RTD) to be connected through one ADC in manner such that the solution is both compact and modular. Communication from the ADC to the processor is though an SPI interface. If 8 RTDs are required for an application, simply connect up one more of these modules. This solution is flexible to where it can handle 2 wire, 3 wire or 4 wire type RTDs.
- Based on the ADS1248 24-Bit Delta-Sigma (ΔΣ) ADC With Internal PGA and Selectable Gain up to 128
- Can Measure 2-, 3-, or 4-Wire RTD Inputs
- Multiplexer (Analog Switch) to Switch Excitation Currents for Four RTD Inputs
- Uses Ratiometric Measurement for Higher Accuracy
- Accuracy < ±2°C Without Calibration for Pt100
- I2C I/O Expander for ADC Interface Control and Excitation Current Switching Provided (No External I/Os Required)
A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
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Reference design overview and verified performance test data
Detailed schematic diagram for design layout and components
Complete listing of design components, reference designators, and manufacturers/part numbers
Detailed overview of design layout for component placement
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Design file that contains information on physical board layer of design PCB
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Includes TI products in the design and potential alternatives.
CSD17571Q2 — 30-V, N channel NexFET™ power MOSFET, single SON 2 mm x 2 mm, 29 mOhmData sheet: PDF | HTML
|*||Design guide||Analog Front End for Sensing Temperature in Smart Grid Applications Using RTD||Dec. 22, 2014|
|Technical article||Check out latest reference design of Analog Front End for Sensing Temperature in Grid Infrastructure Using RTD||Jan. 13, 2015|
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