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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circuit_diagram_13296_thumbnail.png

Resources

Technical Documentation

Product Specifications
Description Version Size
DS5155 DS5155: Digital temperature sensor and thermal watchdog 12.1 645 KB
Application Notes
Description Version Size
AN2680 AN2680: Fan speed controller based on STDS75 or STLM75 digital temperature sensor and ST72651AR6 MCU 1.4 125 KB
AN3108 AN3108: 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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