Engine coolant temperature sensors, Resistance temperature detector

The ultra-low power STMicro STTS22H is a high precision temperature sensor coupled with an A/D converter, signal processing logic and an I²C/SMBus 3.0 interface all housed in a single Application-Specific integrated circuit (ASIC). Offering high performance over the entire operating temperature range, the temperature sensor is housed in a small 2 x 2 x 0.50 mm 6-lead UDFN package with exposed pad down for a better temperature sensing match with the surrounding environment.

https://www.futureelectronics.com/npi/stmicroelectronics-stts22h-digital-temperature-sensor