PT1000s are the most popular types of the platinum resistance temperature sensor elements. PT1000 get their name from PT meaning platinum and 1000 referring to the resistance measuring 1000Ω at...
Digital temperature sensors have an Internal Integrated circuit that will handle the temperature conversion.
The temperature value is placed in a digital register location. This temperature reading is available and transmitted when the correct command protocol has been used with the relevant addresses and instructions.
protocols include I2C , SPI and OneWire.
Digital temperature sensors can simplify electronic design and sometimes reduce amount of code needed to successfully read the temperature , however they are normally more expensive than passive temperature sensors.