Thermoflagger™ over-temperature detection ICs detect temperature rises when configured in a simple circuit with PTC thermistors, whose resistance value changes with the temperature.

KAWASAKI, Japan--(BUSINESS WIRE)--Toshiba Electronic Devices & Storage Corporation ("Toshiba") has launched the first two products in its Thermoflagger™ over-temperature detection IC series ...

To facilitate integration, a reference design called "Over Temperature Detection IC Thermoflagger Application Circuit" has been made available, providing practical guidance for implementation.

Rather than an MCU on the sensor end, you can make/buy a dumb 4-20mA temperature sensor and read it via near-end MCU ADC across a 250R resistor. 1V to 5V drop represents a low to high temp reading ...