Board-level thermal monitoring with programmable limits
The LM77CIM-3/NOPB is a digital local temperature sensor from Texas Instruments that reports the die temperature over an I²C bus. Its 9-bit resolution gives a 0.5°C per LSB step — adequate for detecting thermal runaway or monitoring ambient rise in a power supply, but not for precision thermometry where 12-bit or higher parts are needed. The wider tolerance at the extremes is the figure to budget for qualification testing or extended-temperature deployment.
Standalone thermostat without host polling
The sensor includes an output switch, programmable limit register, and shutdown mode — together these let it act as a standalone over-temperature protector. Set the limit via I²C once, then the output pin asserts when the temperature crosses the threshold, and the host only needs to read the interrupt, not poll continuously. The 8-SOIC package is a standard surface-mount footprint; no special layout beyond a 0.1 µF decoupling cap near the supply pin.