IEEE RFID-TA 2021
A UHF RFID to I2C Bridge IC with Configurable Power Storage Unit for Flexible RFID Sensor Applications. Jun Tan1, Muralikrishna Sathyamurthy1, Hani Abdullah1, Jonathan Gamez1, Bjoern Bieske1, Benjamin Saft1, Martin Grabmann1, Jacek Nowak2, Sylvo Jäger2, and Eric Schäfer1
1IMMS Institut für Mikroelektronik- und Mechatronik-Systeme gemeinnützige GmbH (IMMS GmbH), Ilmenau, Germany; 2Micro-Sensys GmbH, Erfurt, Germany
Abstract: This paper presents the design of a fully passive 865 MHz to 867 MHz UHF RFID to I2C Bridge IC with an integrated I2C master for external digital sensor communications. To provide energy for external devices operation such as sensors, microcontrollers and memories, a Power Storage Unit (PSU) is directly integrated within the IC with an external capacitor as an energy storage element. Hence for communicating with external devices, the IC requires no additional power management components. Additionally, the on-chip I2C master eliminates the need for external microcontroller, thus making the system more energy-efficient and well suited for ultra-low power (ULP) sensing applications requiring battery free operation. The results show that this IC dynamically supplies an external non-volatile memory and a multi-sensor with 1.8 V output voltage and is capable of handling a dynamic load current of up to 1 mA required for multi-sensor readout operation. The memory and the multi-sensor are configured individually for timing and communications, while the sensor data is readout by RFID reader successfully. The chip is fabricated in a standard 0.18 μm SOI CMOS technology and its achieved performance are demonstrated in this paper in combination with a high-performance commercial-of-the-shelf sensor capable of measuring air temperature, humidity, and pressure.
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