Wheel speed sensor with support for indirect tire pressure monitoring

An indirect tire pressure monitoring system (TPMS), comprising:

• a magnetic field sensor configured to generate a modulated sensor signal corresponding to a measured magnetic field indicative of one or more resonance parameters of an automobile tire;
• and
• an analog-to-digital converter (ADC) configured to sample the modulated sensor signal and to provide a digital signal, based upon the samples, to a demodulation element configured generate a demodulated signal having a lower frequency than the modulated sensor signal;
• a spectral analysis element configured to receive the demodulated sensor signal and to perform analysis of the sensor signal to determine the one or more resonance parameters;
• and
• a communication interface configured to transmit data corresponding to the one or more resonance parameters to an electronic control unit (ECU).

A method of measuring a tire pressure, comprising:

• receiving a modulated sensor signal from a magnetic field sensor configured to detect a modulated magnetic field indicative of a wheel speed and one or more resonance frequencies of an automobile tire;
• converting the modulated sensor signal to a digital sensor signal;
• performing analysis of the digital sensor signal to determine the one or more resonance parameters;
• and
• transmitting data corresponding to the one or more resonance parameters to an electronic control unit (ECU).