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Article: PSoC microcontroller and LVDT measure position.(design ideas)
- Article from:
- EDN Asia
- Article date:
- June 1, 2007
- Author:
CopyrightCOPYRIGHT 2007 Reed Business Information, Inc. (US). This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Connecting an LVDT (linear-variable differential transformer) to a microcontroller can prove challenging because an LVDT requires ac-input excitation and measurement of ac outputs to determine its movable core's position (Reference 1).
Most microcontrollers lack dedicated ac signal-generation and -processing capabilities and thus require external circuitry to generate harmonic-free, amplitude- and frequency-stable sine-wave signals. Conversion of an LVDT's output signals' amplitude and phase into a form compatible with a microcontroller's internal ADC usually requires additional external circuitry.
In contrast with conventional microcontrollers, Cypress ...