Clinical-grade human body temperature sensor has ±0.1°C accuracy

October 25, 2016 // By Graham Prophet
Maxim Integrated has posted details of the MAX30205 temperature sensor for thermometer applications. The sensor accurately measures temperature and provide an overtemperature alarm/interrupt/shutdown output.

The chip converts the temperature measurements to digital form using a high-resolution, sigma-delta, ADC. Accuracy meets clinical thermometry specification of the ASTM E1112 when soldered on the final PCB. Communication is through an I ²C-compatible 2-wire serial interface that accepts standard write byte, read byte, send byte, and receive byte commands to read the temperature data and configure the behaviour of the open-drain overtemperature shutdown output.

 

The MAX30205 features three address select lines with a total of 32 available addresses. The sensor has a 2.7V to 3.3V supply voltage range, 600 µA supply current, and a lockup-protected I ²C-compatible interface for wearable fitness and medical applications.

 

This device is available in an 8-pin TDFN package (3 x 3 x 0.75 mm) and operates over the 0°C to +50°C temperature range. Features include;

- ±0.1°C accuracy over the key 37°C to 39°C range (derating to ±0.5C at overall range limits)

- 16-bit (0.00390625°C) temperature resolution

- 2.7V to 3.3V supply voltage range

- One-shot and shutdown modes help reduce power usage

- 600 µA (top) operating supply current

Digital functions for integration;

- Selectable timeout prevents bus lockup

- Separate open-drain OS output operates as interrupt or comparator/thermostat output

 

Maxim Integrated; https://www.maximintegrated.com/en/products/MAX30205