The LM75AIM/NOPB is a digital local temperature sensor from Texas Instruments that communicates over I2C and includes an output switch with programmable limit — meaning it can trigger a fan or alert on its own without a microcontroller polling it. Resolution is 9 bits, which gives you 0.5°C steps — plenty for most thermal monitoring and fan-control loops.
Accuracy and Supply Voltage – What to Watch
Accuracy is ±2°C typical, with a worst-case ±3°C across the full range — the ±3°C limit is the number to use in your system thermal budget, not the typical. Supply voltage spans 2.7V to 5.5V, so it runs on 3.3V or 5V rails without a separate regulator — check your rail tolerance at the low end.