A method, comprising: performing a calibration of a pressure sensor using one or more known input capacitances , by: for each input capacitance of the one or more known input capacitances, for each ambient temperature of a plurality of controlled ambient temperatures, measuring a respective first calibration output of a capacitance-to-frequency conversion circuitry that is output while the input capacitance is connected to an input of the capacitance-to-frequency conversion circuitry, and for each ambient temperature of the plurality of controlled ambient temperatures, for each ambient pressure of a plurality of controlled ambient pressures, measuring a respective second calibration output of the capacitance-to-frequency conversion circuitry that is output while the pressure sensor is connected to the input of the capacitance-to-frequency conversion circuitry; and subsequently to performing a calibration, ascertaining an unknown ambient pressure, based on the first calibration outputs, the second calibration outputs, a measured ambient temperature, a first real-time output of the capacitance-to-frequency conversion circuitry that is output while a given one of the known input capacitances is connected to the input of the capacitance-to-frequency conversion circuitry, and a second real-time output of the capacitance-to-frequency conversion circuitry that is output while the pressure sensor is connected to the input of the capacitance-to-frequency conversion circuitry. performing a calibration of a pressure sensor using one or more known input capacitances , by: for each input capacitance of the one or more known input capacitances, for each ambient temperature of a plurality of controlled ambient temperatures, measuring a respective first calibration output of a capacitance-to-frequency conversion circuitry that is output while the input capacitance is connected to an input of the capacitance-to-frequency conversion circuitry, and for each ambient temperature of the plurality of controlled ambient temperatures, for each ambient pressure of a plurality of controlled ambient pressures, measuring a respective second calibration output of the capacitance-to-frequency conversion circuitry that is output while the pressure sensor is connected to the input of the capacitance-to-frequency conversion circuitry; and for each input capacitance of the one or more known input capacitances, for each ambient temperature of a plurality of controlled ambient temperatures, measuring a respective first calibration output of a capacitance-to-frequency conversion circuitry that is output while the input capacitance is connected to an input of the capacitance-to-frequency conversion circuitry, and for each ambient temperature of the plurality of controlled ambient temperatures, for each ambient pressure of a plurality of controlled ambient pressures, measuring a respective second calibration output of the capacitance-to-frequency conversion circuitry that is output while the pressure sensor is connected to the input of the capacitance-to-frequency conversion circuitry; and subsequently to performing a calibration, ascertaining an unknown ambient pressure, based on the first calibration outputs, the second calibration outputs, a measured ambient temperature, a first real-time output of the capacitance-to-frequency conversion circuitry that is output while a given one of the known input capacitances is connected to the input of the capacitance-to-frequency conversion circuitry, and a second real-time output of the capacitance-to-frequency conversion circuitry that is output while the pressure sensor is connected to the input of the capacitance-to-frequency conversion circuitry. <EOS>