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