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AN251

Title:
Bridge Sensing with the MCP6S2X PGAs
Name:
AN251
Date:
03/14/2004
Author:
Bonnie C. Baker
Description:
Resistive sensors configured as Wheatstone bridges are primarily used to sense pressure, temperature or loads. An external A/D converter (ADC) and a digitally Programmable Gain Amplifier (PGA) can easily be used to convert the difference voltage from these resistor bridge sensors to usable digital words for manipulation by the microcontroller. When the PGA is used in this system, the other channels of the MCP6S2X can be used for other sensors without an increase in signal conditioning hardware or PICmicro® microcontroller I/O pin consumption. The multiplexer and high-speed conversion response of the PGA/Analog-to-Digital (A/D) conversion allows a differential input signal to be sampled and converted in the analog domain and then subtracted in the digital domain with the microcontroller.
Keywords:
PGA,bridge,sensing,resistive,sensors,PIC,A/D
 
Application Notes & Source Code
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  AN251
  03/14/2004
  251KB
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