Sensors

Digital temperature sensor with SMBus and I2C-compatible interface

15th January 2019
Alex Lynn

The TMP117 from Texas Instruments is a high-precision digital temperature sensor. It is designed to meet ASTM E1112 and ISO 80601 requirements for electronic patient thermometers. The TMP117 provides a 16-bit temperature result with a resolution of 0.0078°C and an accuracy of up to ±0.1°C across the temperature range of -20 to +50°C with no calibration.

The TMP117 has in interface that is I2C- and SMBus- compatible, programmable alert functionality, and the device can support up to four devices on a single bus. Integrated EEPROM is included for device programming with an additional 48-bits memory available for general use.

The low power consumption of the TMP117 minimises the impact of self-heating on measurement accuracy. The TMP117 operates from 1.8 to 5.5V and typically consumes 3.5μA.

For non-medical applications, the TMP117 can serve as a single chip digital alternative to a Platinum ETD. The TMP117 has an accuracy comparable to a Class AA ETD, while only using a fraction of the power of the power typically needed for a PT100 ETD. The TMP117 simplifies the design effort by removing many of the complexities of RTDs such as precision references, matched traces, complicated algorithms, and calibration.

The TMP117 units are 100% tested on a production setup that is NIST traceable and verified with equipment that is calibrated to ISO/IEC 17025 accredited standards.

To learn more, click here.

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