Advanced automated calibration technique for Universal Sensors and Transducers Interface IC

An advanced automated calibration technique for a trimming inaccuracy (calibration tolerance) of low-cost quartz resonators that are using in the Universal Sensors and Transducers Interface (USTI) integrated circuits for precision frequency (period)-to-digital conversion is described in the paper. It was shown that such technique can be used also for reducing an error due to a quartz crystal aging and a temperature drift. The experiments and obtained results for USTI´s error investigation in the industrial temperature range -40 _⋯ +85°C have confirmed an efficiency of calibration technique and let to determine the relative error at which it is necessary to use the correction of frequency instability due to trimming inaccuracy and temperature changes.