ams – SL13A & SL900A: Sensor-Enabled RFID Tags Extend Wireless Data-Logging Beyond Identification

On-board temperature sensor enables physiological or environmental data to be logged by a simple wireless tag.

These next-generation sensor-enabled RFID tags offering breakthroughs for medical, automotive safety and other applications where temperature, physiological or environmental data is required. The devices, the SL13A and SL900A enable simple, low cost implementation of a class of wireless data-logging applications.

The SL13A is an ISO15693-compliant tag for use with near field communications (NFC-V) and high-frequency radio-frequency identification (HF RFID) readers. The SL900A is an EPC Gen 2 Class 3 tag for use with RFID readers.

The SL13A and SL900A can be powered by a single-cell or 3V battery. In battery-assisted passive (BAP) mode, the tag’s on-board real-time clock is enabled, and can be used to trigger periodic sensor readings. Up to 762 (SL13A) or 841 (SL900A) time-stamped events may be saved in the on-chip EEPROM, from where they may be read when the device is in range of a reader.

Both the SL13A and SL900A feature a serial peripheral interface for connection to a microcontroller. They can operate from a power supply ranging from 1.2V to 3.6V. The tags provide for very long battery life, drawing a typical 1.6μA in stand-by mode with the real-time clock running. The on-board temperature sensor is accurate to up to 1.0%.

RFID tags are ideally suited for many applications in the transportation, logistics and retail sectors for simple passive, battery-less identification of objects. The SL13A and SL900A represent the next generation of RFID tags, allowing the reading of identification data, as well as temperature and many other environmental conditions.


  • Energy harvesting
  • Passive and semi-passive operation
  • On-chip temperature sensor
  • On-chip EEPROM

  • Patient monitoring
  • Building control
  • Automotive safety