MLX90129 Series Contactless Sensing System

The MLX90129 from Melexis combines a precise acquisition chain for external resistive sensors, with a wide range of interface possibilities. It can be accessed and controlled through its ISO15693 RFID front-end or via its SPI port. With a 13.56 MHz tuned antenna, it becomes an RFID thermometer. For measuring other physical quantities, one or two resistive sensors can be connected to make a battery-less sensing point. Also, the chip can supply a regulated voltage to other components of the application.

Adding a battery will enable the use of the standalone data logging mode. The sensor output data is stored in the internal 3.5 k-bit user memory. One can extend the storage capacity by connecting to an external EEPROM to the SPI port. The SPI port can also connect the MLX90129 to a microcontroller, which allows for applications such as adding actuating capability or RF transmission. The MLX90129 has been optimized for low power, low voltage battery, and battery-less applications.