A system-on-chip NFC bicycle tire pressure measurement system

This paper presents a monolithically implemented NFC bicycle tire pressure measurement system (BTPMS) with integrated antenna, on-chip capacitive pressure and temperature sensor, RFID interface for HF/NFC and EEPROM. This NFC BTPMS has been designed using a 130 nm standard CMOS process and has an active chip area of 5.76 mm². It provides significant cost advantages and impresses with its large scale integration. The used ISO 14443 RFID communication protocol ensures compatibility with state-of-the-art NFC devices. Configuration and calibration data are stored in the integrated EEP-ROM. This battery less stand-alone system is powered wirelessly by any state-of-the-art near field communication device. Using a two-point calibration technique, various measurements have been performed and analyzed regarding accuracy, sensitivity, reproducibility, and temperature dependency. In the pressure range of 1 bar to 6 bar and for temperatures between -15°C to 55°C a ±3σ accuracy of ±0.4 bar is achieved.