STLM75

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High-precision digital temperature sensor and thermal watchdog

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Product overview

Description

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.

  • All 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 I2C/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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STMicroelectronics - STLM75

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Quality and Reliability

Part Number Marketing Status Package RoHS Compliance Grade Material Declaration**
STLM75DS2F
Active
MiniSO-8 Ecopack2
STLM75M2F
Active
SO-8 Ecopack3

STLM75DS2F

Package:

MiniSO-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

MiniSO-8

RoHS Compliance Grade

Ecopack2

STLM75M2F

Package:

SO-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-8

RoHS Compliance Grade

Ecopack3

(**) 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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(*) Suggested Resale Price (USD) per defined quantity for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors