27.4 A 0.8mm3 ±0.68psi single-chip wireless pressure sensor for TPMS applications

This work presents a single-chip sub-mm3 wireless pressure sensor suitable for tire pressure monitoring. The dynamic behavior and safety of an automobile tire is closely dependent on its inflation pressure: maintaining the manufacturerrecommended pressure is essential to prevent tire failure, provide stability, improve fuel efficiency and tire-life, and to reduce CO2 emissions [1]. Thus, Tire-Pressure Monitoring Systems (TPMS) have become an essential component in modern vehicles, as stipulated by the National Highway Traffic Safety Administration (NHTSA) in 2006. State-of-the-art TPMS systems currently require a pressure sensor, multiple ICs, several external components, and a crystal on a PCB allowing wireless transmission of tire pressure [2] [3]. In this work, we describe a sub-mm3 fully integrated wireless pressure sensor including a pressure transducer, interface circuitry, integrated timing reference, and a wireless transmitter integrated into a single die.