Infrared temperature sensor

An infrared temperature sensor, comprising:

• a substrate;
• a cover, disposed on the substrate, cooperating with the substrate to define a receiving space, and including a window and a shield member;
• an infrared sensing chip, disposed on the substrate inside the receiving space, electrically connected with the substrate, and including at least one first thermopile sensing element and a second thermopile sensing element, wherein the first thermopile sensing element is corresponding to the window of the cover and receives a first infrared light beam from exterior to generate a first sensation signal;
• the second thermopile sensing element is corresponding to the shield member of the cover and receives a second infrared light beam radiated by the shield member to generate a second sensation signal;
• an infrared filter plate, disposed on the window, and allowing the first infrared light beam having a specific range of optical wavelengths to pass;
• an ambient temperature sensor, detecting an ambient temperature to generate an ambient temperature sensation signal;
• and
• a signal processor, electrically connected with the first thermopile sensing element, the second thermopile sensing element and the ambient temperature sensor to process the first sensation signal, the second sensation signal and the ambient temperature sensation signal, wherein the signal processor includes:
• a first communication port, being a bus architecture, wherein a host controller selectively performs multicasting communication or unicasting communication with the infrared temperature sensor through the first communication port;
• and
• a second communication port, cascading a plurality of the infrared temperature sensors to the host controller to enable the plurality of the infrared temperature sensors to receive address data that the host controller respectively assigns to the infrared temperature sensors.