Microchip ARD00354, Wheatstone Bridge Reference Design for MCP6N11, MCP6V26, MCP6V27

This board demonstrates the performance of Microchip’s MCP6N11 instrumentation amplifier (INA) and a traditional three op amp INA using Microchip’s MCP6V26 and MCP6V27 auto-zeroed op amps. The input signal comes from an RTD temperature sensor in a Wheatstone bridge. Real world interference is added to the bridge’s output, to provide realistic performance comparisons. Data is gathered and displayed on a PC, for ease of use. The USB PICmicro® microcontroller and included Graphical User Interface (GUI) provides the means to configure the board and collect sample data.

RTD temperature sensor
INA signal conditioning
PICmicro signal conditioning and communications
PC software (GUI): Thermal Management Utility

Microchip provides a free software called 'Thermal Management Utility'. You can find a link for it below. Thermal Management Utility handles communications through the USB connected to your board and will display data on a strip chart. It can store single points of calibration ecoefficiency on the PIC MCU and tells the PIC MCU how to configure the average filter.

http://ww1.microchip.com/downloads/en/DeviceDoc/ThermalManagementUtility-v1.5.8.zip

USB cable

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Instrumentation Amplifiers, Microchip

Instrumentation Amplifier is a type of differential amplifier that has been outfitted with input buffer amplifiers, which eliminate the need for input impedance matching. Characteristics include very low DC offset, low drift, low noise, very high open-loop gain, very high common-mode rejection ratio, and very high input impedances.