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| Discrete Infrared Thermopile Detectors Features and Benefits Solid state thermopile sensor On-chip thermistor for ambient temperature compensation High reliability and long-term stability Low cost, small size MLX90247 family Ordering Information P a rt N o MLX90247 Ta Suffix Package code E (-40C to +85C) SF (TO-39) Type D SA Notice: In case sensor is used in automotive applications, Melexis must be informed. D e s c r ip t io n La r g e a p e r t u r e t h e r m o p i l e d e t e c t o r w i t h o n-c h i p P T C t h e r m i s t o r , f l o a t i ng t h e r m o p i l e o u t p u t s . 3. 5 m m a p e r t u r e Applications Automotive contactless temperature sensing. IR thermometers Gas analysis equipment Occupancy detection 1. Functional Diagram 2. Description At the heart of the MLX90247 thermopile sensors is a silicon die with a central micromachined membrane surrounded by a bulk silicon edge. The hot junctions of the thermopile are positioned near the center of the membrane and the cold junctions are located above the bulk silicon edge. Infrared irradiation of the low thermal conductivity membrane creates a temperature difference between the membrane and the surrounding bulk silicon. The resulting thermopile voltage is a function of the temperature difference between the object and the sensor. Measurement of the absolute temperature of the object is possible by relating the thermopile signal to the temperature of the sensor. The exact temperature of the sensor is measured by a PTC thermistor integrated in the bulk silicon edge. No supply voltage is needed for the thermopile. The sensor and thermistor can be used independently of each other if desired, as the thermopile potential is floating. 60 kOhm 1 Out IR+ 40 uV/K 3 Out IR- Thermopile 2 Rsense 24 kOhm PTC Socket 4 VSS 3901090247 Rev. 004 Page 1 of 9 Data Sheet Oct/07 Discrete Infrared Thermopile Detectors Table of contents 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. FUNCTIONAL DIAGRAM..........................................................................................................1 DESCRIPTION..........................................................................................................................1 GLOSSARY OF TERMS ...........................................................................................................3 PIN DEFINITIONS AND DESCRIPTIONS .................................................................................3 MLX90247 SPECIFICATIONS...................................................................................................4 ABSOLUTE MAXIMUM RATINGS ............................................................................................5 UNIQUE FEATURES.................................................................................................................5 APPLICATIONS INFORMATION ..............................................................................................6 RELIABILITY INFORMATION...................................................................................................7 ESD PRECAUTIONS ................................................................................................................7 PACKAGE INFORMATION.......................................................................................................7 DISCLAIMER ............................................................................................................................9 MLX90247 family 3901090247 Rev. 004 Page 2 of 9 Data Sheet Oct/07 Discrete Infrared Thermopile Detectors MLX90247 family 3. Glossary of Terms IR: Infrared. Every object emits infrared radiation in relation to its temperature. This effect can be used to measure the temperature without the need for physical contact. PTC: On-chip thermistor which resistance increases with rising temperature (Positive Thermal Coefficient) tbb: Black body (object temperature) ta: Ambient (die) temperature 4. Pin Definitions and Descriptions TO-39 package - connections 1 P in 2 4 1 2 3 4 Sy m b o l O u tIr+ R s e ns Vs s D e s c r ip t io n I nf r a r e d T h e r m o p i l e p o s i t i v e o u t p u t O u tIr- T h e r m i s t o r g r o u nd / c a s e p o t e nt i a l I nf r a r e d T h e r m o p i l e ne g a t i v e o u t p u t T h e r m i s t o r - a m b i e nt ( d i e ) t e m p e r a t u r e s e ns o r 3 Top view = pins down 3901090247 Rev. 004 Page 3 of 9 Data Sheet Oct/07 Discrete Infrared Thermopile Detectors MLX90247 family 5. MLX90247 Specifications Operating temperature range: Ta = -40 to 85 C unless otherwise noted Se ns i t i v e A r e a P a ra m e te r T y p ic a l 1. 2 x 1. 2 12 15 mm m U n it s 2 C o n d it io n W a v e l e ng t h r a ng e D C m e m b r a ne r e s p o ns i t i v i t y Se ns i t i v i t y ( A l p h a ) T h e r m o p ile o u t p u t v o lt a g e W i nd o w a p e r t u r e s i z e F ie ld o f v ie w Sp e c t r a l s e ns i t i v i t y T h e r m o p i l e R e s i s t a nc e N o is e NEP 5 .5 ... 4. 28 46 25 % x 10-13 V/K4 mm V V/W 25 % 3. 5 88 > 70 <1 60 32 T a = 26 C T b b = 27 C, F u l l F O V 5 0% t h e r m o p i l e s i g na l 7 .5 0< < 5 m < < 13. 5 m m F u ll F O V T a = 25 C T b b = 6 0 C D eg % k % T i m e c o ns t a nt 2. 6 T h e r m o p i l e r e s i s t a nc e t e m p c o P T C v a l u e R ( 25 C) P T C T C1 P T C T C2 W i t h s t a nd E SD v o l t a g e 6 5 00 20 % + 8 00 16 24 3 0 % 0. 1 30 ms k nW / H z %/C nV / H z T a = 25 C R MS, T a = 25 C R MS, T a = 25 C p p m / C V V T a = 25 C p p m / C2 - 7 000 NOTE: The thermistor resistance can be calculated using following expresion: R(T ) = R(25o C ) 1 + TC1 (T - 25o C ) + TC2 (T - 25o C )2 [ ] Thermopile output voltage is: Vir = Alpha .[ (To4) - (Ta4) ] where To is the measured object temperature, both To and Ta are in Kelvins 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. 3901090247 Rev. 004 Page 4 of 9 Data Sheet Oct/07 Discrete Infrared Thermopile Detectors MLX90247 family Internal schematics 6. Absolute Maximum Ratings St o r a g e T e m p e r a t u r e R a ng e A p p lie d D Cv o lt a g e P a ra m e te r -5 5 / 15 0 -0. 5 / 12 V a l ue U n it s C V R e m a rk P i ns 1 a nd 3 t o g r o u nd ( p i n4) A p p lie d D Cv o lt a g e -0. 5 / 12 V P i n 2 t o g r o u nd ( p i n4) Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolutemaximum-rated conditions for extended periods may affect device reliability. 7. Unique features Fully CMOS compatible process High reliability Suitable for automotive applications Thermistor integrated in silicon edge of the sensor: closest possible sensing of sensor temperature 3901090247 Rev. 004 Page 5 of 9 Data Sheet Oct/07 Discrete Infrared Thermopile Detectors MLX90247 family 8. Applications information The output voltage of the thermopile is positive when the object is at higher temperature than the sensor; it is negative when the object is at lower temperature than the sensor. As the output voltage can become positive as well as negative, the sensor has to be connected to a differential amplifier that can accept both positive and negative input signals. The figure below shows a solution using the MLX90313 infrared sensor interface chip, which accepts common mode input voltages in the range [-0.1V;Vdd-3V] IR+ IRRsens VSS VDD IRINP IRINN TEMPOUT TINP TINN IROUT IROUT TEMPOUT C3 5V MLX90247 MLX90313 CS SCLK SDI SDO REL1 CS SCLK DIN DOUT REL VREF VSS/GND CREF VSS VREFP R3 MLX90601KZA-CKA MLX90601KZA-CKD MLX90601KZA-CLA R3 = 100k C3 = 10F The figure below shows a typical application with the AD8628 low-offset low-drift differential opamp from Analog Devices. The AD8628 has single voltage supply, and can only accept positive common mode input signals. Vref sets the output offset (output voltage when To=Ta). 100 100k 5V MLX90247DSA AD8628 AD8628 + Vref 60k Vthermopile 3901090247 Rev. 004 Page 6 of 9 Data Sheet Oct/07 Discrete Infrared Thermopile Detectors MLX90247 family 9. Reliability Information Melexis Infrared sensors are sealed to withstand a fine and gross leak test according MIL 883 Method 1014 (Seal)/ JEDEC-STD-22 Test Method A 109 (Hermeticity). For more information on manufacturability / solderability see quality page at our website: http://www.melexis.com/ Please contact Melexis for specific information using MLX90247 sensors in automotive applications. 10. ESD Precautions Electronic semiconductor products are sensitive to Electro Static Discharge (ESD). Always observe Electro Static Discharge control procedures whenever handling semiconductor products. 11. Package information Housing specifications T O -39 s p e c i f i c a t i o ns Me t a l c a p W e ld e d T O 39 h e a d e r F i l l i ng g a s Marking MLX90247 P a rt N o N itr o g e n A u P la te d Type D SA SF ( T O -39) , 3, 5 m m Package C ode MLX90247 B P T C F O XXXZ Z M a r k in g X X X - la s t d ig it s o f lo t n u m b e r Z Z -w a fe r n u m b e r Y Y W W - d a t e c o d e w it h Y Y - y e a r , W W - w e e k o f a s s e m b ly 3901090247 Rev. 004 Page 7 of 9 Data Sheet Oct/07 Discrete Infrared Thermopile Detectors MLX90247 family Position of membrane in housing Package Outline 3901090247 Rev. 004 Page 8 of 9 Data Sheet Oct/07 Discrete Infrared Thermopile Detectors MLX90247 family 12. Disclaimer Devices sold by Melexis are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. Melexis makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. Melexis reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with Melexis for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by Melexis for each application. The information furnished by Melexis is believed to be correct and accurate. However, Melexis shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interrupt of business or indirect, special incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of Melexis' rendering of technical or other services. (c) 2006 Melexis NV. All rights reserved. For the latest version of this document, go to our website at: www.melexis.com Or for additional information contact Melexis Direct: Phone: +32 13 67 04 95 E-mail: sales_europe@melexis.com Europe and Japan: Phone: +1 603 223 2362 E-mail: sales_usa@melexis.com All other locations: ISO/TS 16949 and ISO14001 Certified 3901090247 Rev. 004 Page 9 of 9 Data Sheet Oct/07 |
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