Improved LM75 Temperature Sensor

By NXP Semiconductors 105

Improved LM75 Temperature Sensor

NXP Semiconductors PCT2075 is a temperature-to-digital converter featuring ±1°C max accuracy over -25°C to +100°C range and ±2°C max accuracy over +55°C to +125°C range. It uses an on-chip bandgap temperature sensor and sigma-delta A to D conversion technique with an overtemperature detection output that is a drop-in replacement for other LM75 series thermal sensors. The device contains a number of data registers: configuration register (Conf) to store the device settings such as device operation mode, OS operation mode, OS polarity, and OS fault queue; temperature register (Temp) to store the digital temp reading, set-point registers (Tos and Thyst) to store programmable overtemperature shutdown and hysteresis limits, and programmable temperature sensor sampling time (Tidle), that can be communicated by a controller via the 2-wire serial I²C bus Fast-mode Plus (Fm+) interface.

The PCT2075 can be configured for different operating conditions. It can be set in normal mode to periodically monitor the ambient temperature or in shut-down mode to minimize power consumption. The overtemperature shutdown (OS) output can function in interrupt or comparator mode, allowing quick and flexible system control based on overtemperature or thermal runaway conditions.


  • Highly customizable
    • Features pin-for-pin replacement for LM75 series but allows up to 27 devices on the bus (three address pins in the 8-pin package) or three devices on the bus (one address pin in the 6-pin package)
  • Small package
    • Small 8-pin package types: SO8, TSSOP8, and 2 mm x 3 mm HWSON8 and 6-pin package type: TSOP6 – the P110 and N005 variants are only available in the TSOP6 package
  • High-temperature range and accuracy
    • The PCT2075 boasts a wide range of temperature sensing capabilities
      • -55°C to +125°C
      • Accuracy ±1°C max from -25°C to +100°C
      • Accuracy ±2°C max from -55°C to +125°C

  • System thermal management
  • Personal computers
  • Electronics equipment
  • Industrial controllers