AMS launches temperature sensor with NFC front-end
The AS39513 is an NFC sensor tag and data logger IC for smart labels which enables more efficient and accurate monitoring of the condition of assets such as food, pharmaceuticals and healthcare products in storage and in transit. It includes an NFC front end, a temperature sensor and an analog interface to an external sensor. Other functions integrated in the IC are a real-time clock, a 10-bit ADC, a configurable data-logging engine, a 9kbit password-protected EEPROM and a serial peripheral interface (SPI) to connect to an external microcontroller. The AS39513 is available as a bumped die or in a chip-scale package which is 0.3mm high.
Powered by a single-cell (typically 1.5V) or dual-cell (3V) battery, the AS39513 can store up to 1,020 time-stamped sensor measurements. Fully compliant with ISO15693 and NFC-V (T5T) stan-dards, it can be read over a range of a few centimeters with an NFC mobile phone. An extended read range of 1-2m can be achieved when using dedicated ISO15693 readers, offering the ability to read multiple AS39513 tags simultaneously in cabinets or refrigerators.
The new AS39513, which supersedes the ams SL13A sensor tag, has a higher-performance temperature sensor which offers guaranteed accuracy of ±0.5°C in the critical range from -20°C to 10°C, and ±1°C over an extended range from -20°C to 55°C.
Drawing 2µA of stand-by current, the AS39513 can autonomously log temperature data for more than a year on a 30mAh single-cell battery. This superior power performance enables the use of smaller and cheaper batteries, paving the way to farm-to-fork item-level tagging. The chip operates in passive mode and harvests energy from a reader’s incoming RF field, supplying external circuitry with a current of up to 3mA at 1.8V.
The AS39513 is available in production volumes now. Unit pricing is US$1.19 in order quantities of 5,000. A demonstration kit, including an evaluation board and a sample app for devices running on the Android operating system, is available.
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