MLX90247B

www.DataSheet4U.com MLX90247B Thermopile w/On-Chip Thermistor Features and Benefits Solid state sensor High reliability Low cost, small size On chip temperature sensor Applications Non-Contact Temperature Sensing Differential Temperature Sensing Climate Control Ear, Temple Thermometers Household and Commercial Appliances Ordering Information Part No. MLX90247B Description Thermopile with On-chip PTC Thermistor Functional Diagram Description The MLX90247B is a thermopile sensor IC which detects very small amounts of heat radiation. The sensor consists of a membrane with a thermopile on top of it. The hot junctions of the thermopile are positioned near the center of the membrane, the cold junctions above the bulk silicon edge. Due to the low thermal conductivity of the membrane, absorbed heat will cause the temperature to increase more at the center of the membrane than at the edge above the bulk. This temperature difference is converted to an electric potential by the thermo-electric effect in the thermopile junctions. No supply voltage is needed. ϑ + The sensor IC is integrated together with a PTC thermistor in one silicon mass. The PTC is adjacent to the cold junctions of the thermopile. As such, use of the PTC is considered the more accurate method of measuring thermopile cold junction temperature, and thus overall sensor accuracy when making noncontact temperature measurement. The sensor and thermistor can be used independent of each other if desired, as the thermo...