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STLM75：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)

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