Temperature logger with RFID read-out

High precision temperature monitoring for IOT applications.

The ASIC is an ISO 14443A transponder chip (PICC) that performs and stores temperature measurements with a configurable time interval.

The device is mounted with a battery for autonomous temperature logging. If the battery expires, the measurement data can be accessed through passive RFID access.
Possible applications are: temperature logging for temperature sensitive objects/parcels or RF interface to various SPI controlled sensors (e.g., pressure, tilt voltage, light, etc.). An auxiliary differential input to the ΣΔ ADC can support an additional external analog sensor.

Application areas:

• NFC based IOT applications with need for temperature sensing.

• High precision temperature sensing

• Advanced logistics with temperature sensing

• NFC with other external sensors

Top technical features:

• RFID fully compliant up to ISO 14443A-4 (ISO 15693 option)

• Temperature accuracy: ±0.5°C (abs), ±0.1°C (relative)

• Temperature range -30°C to +100ºC

• Fully configurable temperature logging profile

• 16 bits linear low-offset instrumentation ΣΔ ADC

• 10 K samples storage capacity

• SPI master interface for auxiliary slave

• Optional ultra-low power crystal clock

• MSP430 CPU with debug interface

• Ultra-low power tag storage mode (< 0.1μA)