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. 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. ϑ + The sensor and thermistor can be used independent of each other if desired, as the thermopile potential is floating. MLX90247B Discrete Infrared Sensor IC Page 1 Rev 1.0 17/Feb/01 MLX90247B Thermopile w/On-Chip Thermistor MLX90247B Electrical Specifications o o DC Operating Parameters TA = -40 C to 150 C, (unless otherwise specified) Parameter Thermopile Resistance Symbol Rtp Sensitivity S TC of Sensitivity Time constant Thermistor Value TCs T Rptc A1 A2 Thermal Coefficient PTC (1) Test Condition @298K sensor @298K black body @299K @298K @298K Min 44 Typ 59.5 Max 75 Unit kΩ 29 42 55 µV/K 30 33.8 8580 %/K ms kΩ ppm/K ppm/K2 0.1 18.2 5720 25°C-100°C 26 7150 11.57 2 (1) R(T)=R(298K).[1+A1.(T-298K)+A2.(T-298) ] Note: when measuring resistances with an ohm meter, please take care that the internal protection diodes, as indicated in the diagram below, are always reverse biased. ϑ + MLX90247B Absolute Maximum Ratings Parameter Operating temperature Storage temperature Soldering temperature Value -40 ~ 150 -40 ~ 150 <220 MLX90247B Discrete Infrared Sensor IC Unit °C °C °C Page 2 Comment Keep diode leakage in mind at high temperatures t<5sec Rev 1.0 17/Feb/01 MLX90247B Thermopile w/On-Chip Thermistor MLX90247B Pinout Pin 1 2 3 4 Symbol OutIr+ Rsens OutIrVss Description Infrared Thermopile positive output Thermistor for sensor ambient temperature measurement Infrared Thermopile negative output Thermistor ground / case potential TO-39 package - connections 1 2 4 3 Top view = pins down ML90247B Mechanical Specifications Parameter TO-39 specifications Metal cap Filling gas Filter specifications Transmission Transmission Sensor window FOV Aperture diameter Value Unit Comment Welded Nitrogen >75 <0.5 % % 7.5µ < λ <13.5µ 0 < λ < 5µ 100 3.5 ° mm Full opening angle: Determined by aperture Default ESD Precautions Electronic semiconductor products are sensitive to Electro Static Discharge (ESD). Always observe ESD control procedures whenever handling semiconductor devices. Disclaimer Melexis reserves the right to periodically make modifications to product specifications. The information included herein is believed to be accurate and reliable. However, Melexis assumes no responsibility for its use; nor for any infringements of patents or other rights of third parties which may result from it’s use. MLX90247B Discrete Infrared Sensor IC Page 3 Rev 1.0 17/Feb/01 MLX90247B Thermopile w/On-Chip Thermistor RA (TO-39) Package Outline For the latest version of this document, Go to our website at: France Melexis France Tour Arago, 5 rue Bellini, 92806 Puteaux-La-Défense, France. Phone: +33 1 47 78 11 34 Fax: +33 1 47 78 06 35 E-mail: [email protected] www.melexis.com Or for additional information contact Melexis Direct: Italy Dimacred IRL Via Papa Giovanni XXIII no. 25, 20046 Biassono, Italy Phone: +39 039 249 4856 Fax: +39 039 491773 E-mail: [email protected] USA Melexis Inc. 41 Locke Road, Concord, NH 03301 Phone: +1 603 223 2362 E-mail: [email protected] Fax: +1 603 223 9614 Japan Thermopile Japan Co., LTD 3-48-10 Ogikubo, Suginami-ku, Tokyo Phone: +81 3 3392 6961 E-mail: [email protected] United Kingdom Silicon Concepts PCB Lynchborough Road, Hampshire GU30 7SB, United Kingdom Phone: +44 1428 751 617 Fax: +44 1428 751 603 E-mail: [email protected] Taiwan Beechwood Int’l Taiwan Co. Room 8, 17F, No. 189, Taipei, Taiwan Phone: +886 2 2739 3322 E-mail: [email protected] Germany Schiess-strasse 55, 40549 Düsseldorf, Germany Phone: +49 211 5360212 Fax: +49 211 5360250 E-mail: [email protected] MLX90247B Discrete Infrared Sensor IC Fax: +81 3 3392 6901 Page 4 Fax: +886 2 2739 3090 Rev 1.0 17/Feb/01