PSoC dual sensor for pressure and temperature using bipolar junction effects

This paper presents theoretical and experimental aspects of the methodology for embedded sensor design with PSoC controllers for measuring the pressure and temperature using two NPN transistors, enlightening the benefits of the method: a PSoC design reduces the time-to-market, increase flexibility, lower part count, provides in-system performance improvement, design security, and field upgrades. Also, another benefit of a PSoC controller is the dynamical re-configuration. The effect of pressure over an emitter-base junction makes a modification of the saturation current, that means a translation of the input characteristic of the emitter-base junction to higher values. The method consists in measuring the temperature and pressure using two transistors and compensates the dependencies between them. This is done by using the same PSoC´s pins and an internal dynamic reconfiguration: one configuration for measuring pressure and one configuration for measuring temperature