MLX90247C Thermopile w/NTC 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. MLX90247C Description Thermopile with 100K NTC Thermistor Functional Diagram Description The MLX90247C 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 packaged together with a NTC chip thermistor for cold junction reference. The thermopile and thermistor are separate components, mounted in close proximity. The NTC thermistors have higher sensitivity at low temperatures than the standard PTC thermistors in the B and D models. ϑ − The sensor and thermistor can be used independent of each other if desired, as the thermopile potential is floating. MLX90247C Discrete Infrared Sensor IC Page 1 Rev 1.0 17/Feb/01 MLX90247C Thermopile w/NTC Thermistor MLX90247C 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 Thermal Coefficient NTC (1) TCs T Rntc βntc Test Condition @298K sensor @298K black body @299K @298K @298K 0-50°C (1) Min 44 Typ 59.5 Max 75 Unit kΩ 29 42 55 µV/K 30 105 4161 %/K ms kΩ K 0.1 95 4120 100 4140 (1) Tolerance given between 15°C and 35°C. Typical value corresponds to a relative resistance change of –4.68%/°C. Definition of β is ∆lnR/∆(1/T) with T in K. (Naperian logarithm). Note: when measuring resistances with an ohm meter, please take care that the internal protection diodes, as indicated in the functional diagram below, are always reverse biased. ϑ − MLX90247C Absolute Maximum Ratings Parameter Operating temperature Storage temperature Soldering temperature Value -40 ~ 150 -40 ~ 150 <220 MLX90247C 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 MLX90247C Thermopile w/NTC Thermistor MLX90247C 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 ML90247C 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. MLX90247C Discrete Infrared Sensor IC Page 3 Rev 1.0 17/Feb/01 MLX90247C Thermopile w/NTC 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] MLX90247C Discrete Infrared Sensor IC Fax: +81 3 3392 6901 Page 4 Fax: +886 2 2739 3090 Rev 1.0 17/Feb/01