Digital temperature sensor and thermal watchdog

The STLM75 is a high-precision digital CMOS temperature sensor IC with a sigma-delta temperature-to-digital converter and an I2C-compatible serial digital interface. It is targeted for general applications such as personal computers, system thermal management, electronics equipment, and industrial controllers, and is packaged in the industry standard 8-lead TSSOP and SO8 packages.

The device contains a band gap temperature sensor and 9-bit ADC which monitor and digitize the temperature to a resolution up to 0.5 °C. The STLM75 is typically accurate to (±3 °C - max) over the full temperature measurement range of –55 °C to 125 °C with ±2 °C accuracy in the –25 °C to +100 °C range. The STLM75 is pin-for-pin and software compatible with the LM75B.

The STLM75 is specified for operating at supply voltages from 2.7 V to 5.5 V. Operating at 3.3 V, the supply current is typically (125 μA).

The on-board sigma-delta analog-to-digital converter (ADC) converts the measured temperature to a digital value that is calibrated in degrees centigrade; for Fahrenheit applications a lookup table or conversion routine is required.

The STLM75 is factory-calibrated and requires no external components to measure temperature.

Key Features

  • Measures temperatures from –55°C to +125°C (–67°F to +257°F)
    • ±0.5°C (typ) accuracy
    • ±2°C (max) accuracy from –25°C to +100°C
  • Low operating current: 125 μA (typ)
  • No external components required
  • 2-wire I2 C/SMBus-compatible serial interface
    • Supports bus time-out feature
    • Selectable bus address allows connection of up to eight devices on the bus
  • Wide power supply range-operating voltage range: 2.7 V to 5.5 V
  • Conversion time is 150 ms (max)
  • Programmable temperature threshold and hysteresis set points
  • Pin- and software-compatible with LM75 (drop-in replacement)
  • Power-up defaults permit standalone operation as a thermostat
  • Shutdown mode to minimize power consumption
  • Output pin (open drain) can be configured for interrupt or comparator/thermostat mode (dual purpose event pin)
  • Packages:
    • SO8
    • MSOP8 (TSSOP8)

Circuit Diagram

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Resources

Technical Documentation

Product Specifications
Description Version Size
Digital temperature sensor and thermal watchdog 12.1 645 KB
Application Notes
Description Version Size
Fan speed controller based on STDS75 or STLM75 digital temperature sensor and ST72651AR6 MCU 1.4 125 KB
STLM75 firmware library for the STM32F10x 1.2 785 KB

Publications and Collaterals

Flyers
Description Version Size
STTS75 2.2 706 KB

Tools and Software

Embedded Software
MCUs Embedded Software
Support & Community

Sample & Buy

Part Number Package Packing Type Operating Temperature (°C) (min) Operating Temperature (°C) (max) Marketing Status Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
STLM75DS2F MSOP/TSSOP 8 Tape And Reel -55 125 Active - - NEC EAR99 MALAYSIA MORE INFO DISTRIBUTOR AVAILABILITY
STLM75M2F SO-8 Tape And Reel -55 125 Active - - NEC EAR99 MOROCCO MORE INFO DISTRIBUTOR AVAILABILITY
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(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors

Quality & Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
STLM75DS2F ActiveMSOP/TSSOP 8IndustrialEcopack2 0 0
STLM75M2F ActiveSO-8IndustrialEcopack1 (*) 0 0
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(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.

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