Zero-Power MEMS Sensor Actuated RFID System

摘要

We present an RFID system with embedded passive MEMSsensor switches to provide long-term, item-level monitoringand data logging. This patented temperature monitoringprototype for blood bag monitoring utilizes MEMS cantileverarray both as passive multi-temperature sensors and as powertriggers for data logging circuitry, all packaged in a flexiblelaminated PCB (2.5 × 2.5 × 0.2 cm). This system uses zeropower to monitor temperature and uA level current to recordtemperature data beyond preset thresholds. The on-board datalogger consists of a dual-communication, HIPAA compliant,13.56 MHz RFID chip and customized antenna, an ultra-lowpower micro-controller, and supporting passives. Prototypesare estimated to have more than 60 days of continuedtemperature monitoring per use with a thin film battery.