TMP117 Digital Temperature Sensor

By Texas Instruments 95

TMP117 Digital Temperature Sensor

Texas Instruments' TMP117 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°C to +50°C with no calibration. The TMP117 has an interface that is I2C- and SMBus™-compatible with programmable alert functionality, and the device can support up to four devices on a single bus. An integrated EEPROM is included for device programming with an additional 48-bits of memory available for general use.

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

The TMP117 can serve as a single-chip digital alternative to a platinum resistance temperature detector (RTD) in non-medical applications. The TMP117 has an accuracy comparable to a Class AA RTD while only using a fraction of the power of the power typically needed for a PT100 RTD. The TMP117 simplifies the design effort by removing many of the complexities of RTDs including 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.

  • Operating temperature range: -55°C to +150°C
  • Supply range: 1.8 V to 5.5 V
  • 16-bit resolution: ±0.0078°C (1 LSB)
  • Programmable temperature alert limits
  • Selectable averaging
  • Digital offset for system correction
  • General-purpose EEPROM: 48-bits
  • NIST traceability
  • SMBus, I2C interface compatibility
  • TMP117 high-accuracy temperature sensor:
    • ±0.1°C (max.) from -20°C to +50°C
    • ±0.15°C (max.) from -40°C to +70°C
    • ±0.2°C (max.) from -40°C to +100°C
    • ±0.25°C (max.) from -55°C to +125°C
    • ±0.3°C (max.) from -55°C to +150°C
  • Low power consumption:
    • 3.5 µA, 1 Hz conversion cycle
    • 150 nA shutdown current
  • Medical grade: meets ASTM E112 and ISO 80601-2-56
  • Environmental monitoring and thermostats
  • Asset tracking and cold chains
  • Gas meters and heat meters
  • Test and measurement
  • RTDs replacement: PT100, PT500, PT1000
  • Cold-junction compensation of thermocouples


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