MLX90247 family Discrete Infrared Thermopile Detectors Features and Benefits Solid state thermopile sensor On-chip thermistor for ambient temperature compensation High reliability and long-term stability Very high ESD protection – 7 kV on all pins (only for MLX90247BAA and MLX90247BAL) Low cost, small size Ordering Information Part No Ta Suffix Package code MLX90247 E (-40C to +85C) SF(TO-39) MLX90247 E (-40C to +85C) SF(TO-39) MLX90247 E (-40C to +85C) SF(TO-39) MLX90247 E (-40C to +85C) SF(TO-39) Type Description Large aperture (3.5mm) thermopile detector with on-chip PTC DSA thermistor, floating thermopile outputs. Small aperture (2.5mm) thermopile detector with on-chip PTC DSL thermistor, floating thermopile outputs. Large aperture (3.5mm) thermopile detector with on-chip PTC BAA thermistor, floating thermopile outputs. Excellent ESD Small aperture (2.5mm) thermopile detector with on-chip PTC BAL thermistor, floating thermopile outputs. Excellent ESD Notice: In case sensor is used in automotive applications, Melexis must be informed. Applications Automotive contactless temperature sensing. IR thermometers Gas analysis equipment Occupancy detection 1. Functional Diagram 60 kOhm 1 Out IR+ 40 uV/K 3 Out IRThermopile 2 Rsense 24 kOhm 4 PTC Socket 3901090247 Rev. 003 VSS 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. The MLX90247DSL (BAL) sensor IC is similar to MLX90247DSA (BAA) but with smaller aperture, thus resulting in narrower field of view (FOV). Page 1 of 10 Data Sheet Jun/04 MLX90247 family Discrete Infrared Thermopile Detectors Table of contents 1. FUNCTIONAL DIAGRAM ............................................................................................................. 1 2. DESCRIPTION............................................................................................................................... 1 3. GLOSSARY OF TERMS ............................................................................................................... 3 4. PIN DEFINITIONS AND DESCRIPTIONS .................................................................................... 3 5. MLX90247 SPECIFICATIONS ...................................................................................................... 3 6. UNIQUE FEATURES..................................................................................................................... 5 7. APPLICATIONS INFORMATION.................................................................................................. 6 8. RELIABILITY INFORMATION ...................................................................................................... 7 9. ESD PRECAUTIONS .................................................................................................................... 7 10. PACKAGE INFORMATION........................................................................................................... 8 11. DISCLAIMER............................................................................................................................... 10 3901090247 Rev. 003 Page 2 of 10 Data Sheet Jun/04 MLX90247 family Discrete Infrared Thermopile Detectors 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) 4. Pin Definitions and Descriptions TO-39 package - connections 1 Pin Symbol Description OutIr+ Infrared Thermopile positive output Rsens Thermistor for sensor ambient temperature measurement 3 OutIr- Infrared Thermopile negative output 4 Vss Thermistor ground / case potential 1 2 4 2 3 Top view = pins down 5. MLX90247 Specifications Operating temperature range: Ta = -40 to 125 ˚C unless otherwise noted Parameter Type Typical Units Sensitive Area All 1.2 x 1.2 mm2 DC membrane responsitivity All 12 Sensitivity DSA and BAA Window aperture size Field of view Spectral sensitivity Condition V/W Tbb = 25˚C 46 ±25% µV/˚C Full FOV DSL and BAL 34 ±25% µV/˚C Full FOV DSA and BAA 3.5 mm DSL and BAL 2.5 mm DSA and BAA 100 deg DSL and BAL 85 deg All > 70 % 7.5µm < λ < 13.5µm <1 % 0 < λ < 5µm 90% of energy Thermopile Resistance All 60 kΩ Ta = 25˚C Noise All 32 nV / √Hz RMS, Ta = 25˚C 3901090247 Rev. 003 Page 3 of 10 Data Sheet Jun/04 MLX90247 family Discrete Infrared Thermopile Detectors NEP All 2.6 nW / √Hz Time constant All 30 ms Sensitivity TC All 0.1 Thermistor value All 24 Thermistor TC 1 All 6500 Thermistor TC 2 All 16 ppm/˚C2 DSA and DSL 700 V BAA and BAL 7000 V Withstand ESD voltage RMS, Ta = 25˚C % / ˚C kΩ ±30% Ta = 25˚C ppm/˚C ±20% typical 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 ] Note: Due to the strong ESD protection BAA and BAL versions can only be used with CM (Common Mode) = 0V for IR outputs. 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 (DSA and DSL versions). Internal schematics BAA and BAL DSA and DSL Thermopile Thermopile 30 kOhm 30 kOhm 1 1 220 Ohm 220 Ohm 20 uV/K Not connected 20 uV/K Not connected 220 Ohm 220 Ohm 20 uV/K 3 20 uV/K 3 220 Ohm 30 kOhm 220 Ohm 2 2 480 Ohm 480 Ohm 24 kOhm 4 24 kOhm 4 CASE 3901090247 Rev. 003 30 kOhm CASE Page 4 of 10 Data Sheet Jun/04 MLX90247 family Discrete Infrared Thermopile Detectors Absolute Maximum Ratings Parameter Storage Temperature Range Applied DC voltage Applied DC voltage Version Units All -55 ÷150 BAA and BAL -0.5 ÷ 0.5 DSA and DSL -0.5 ÷ 12 BAA and BAL -0.5 ÷ 12 DSA and DSL -0.5 ÷ 12 Remark °C V Pins 1 and 3 to ground (pin4) V Pin 2 to ground (pin4) Exceeding the absolute maximum ratings may cause permanent damage. maximum-rated conditions for extended periods may affect device reliability. Exposure to absolute- 6. Unique features - Fully CMOS compatible process High reliability Suitable for automotive applications Extremely high ESD resistance: 7 kV Thermistor integrated in silicon edge of the sensor: closest possible following of sensor temperature 3901090247 Rev. 003 Page 5 of 10 Data Sheet Jun/04 MLX90247 family Discrete Infrared Thermopile Detectors 7. Applications information As shown in the internal schematics drawings in paragraph 5, the MLX90247BAA and BAL use a die with additional protection diodes for very high ESD performance. The configuration of the protection diodes is such that the MLX90247BAA and BAL can only be biased around ground potential. 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 common mode 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 5V IRINP C3 IRINN TEMPOUT TEMPOUT TINP IROUT IROUT TINN MLX90247 MLX90313 CREF VSS CS SCLK SDI SDO CS SCLK DIN DOUT REL1 REL VREFP VREF VSS/GND R3 MLX90601KZA-CKA MLX90601KZA-CKD MLX90601KZA-CLA R3 = 100kΩ C3 = 10µF Using the MLX90247DSA or DSL, the ESD performance is lower, but there is the possibility to apply a non-zero bias voltage Vref to the thermopile. The figure below shows a typical application with the AD8628 low-offset low-drift differential opamp of Analog Devices. The AD8628 has single voltage supply, and can only accept positive common mode input signals. This application is not possible with the M:X90247BAA or BAL, as the BAA and BAL cannot be biased with Vref. 100kΩ 100Ω 5V + Vref 3901090247 Rev. 003 60kΩ AD8628 MLX90247DSA Vthermopile Page 6 of 10 Data Sheet Jun/04 MLX90247 family Discrete Infrared Thermopile Detectors 8. Reliability Information Melexis Infrared sensors are sealed to withstand a fine and gross leak test according MIL883 Method 1014 (Seal) / JESD22-A109 (Hermeticity). Please contact Melexis for specific information using MLX90247 sensors in automotive applications. 9. ESD Precautions Electronic semiconductor products are sensitive to Electro Static Discharge (ESD). Always observe Electro Static Discharge control procedures whenever handling semiconductor products. 3901090247 Rev. 003 Page 7 of 10 Data Sheet Jun/04 MLX90247 family Discrete Infrared Thermopile Detectors 10. Package information Housing specifications (TO39) Metal cap Welded TO39 header Au plating Filling gas Nitrogen Marking Part No Type Package Code Marking MLX90247 DSA SF(TO-39), 3,5mm MLX90247B PTC FO XXXZZ MLX90247 DSL SF(TO-39), 2,5mm MLX90247H PTC FO XXXZZ MLX90247 BAA SF(TO-39), 3,5mm MLX90247BAA YYWW MLX90247 BAL SF(TO-39), 2,5mm MLX90247BAL YYWW XXX- last digits of lot number ZZ – wafer number YYWW – date code with YY- year, WW- week of assembly Position of membrane in housing 3901090247 Rev. 003 Page 8 of 10 Data Sheet Jun/04 MLX90247 family Discrete Infrared Thermopile Detectors Package Outline DSL and BAL DSA and BAA 3901090247 Rev. 003 Page 9 of 10 Data Sheet Jun/04 MLX90247 family Discrete Infrared Thermopile Detectors 11. 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. © 2002 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: Europe and Japan: Phone: +32 13 67 04 95 E-mail: [email protected] All other locations: Phone: +1 603 223 2362 E-mail: [email protected] ISO/TS16949 and ISO14001 Certified 3901090247 Rev. 003 Page 10 of 10 Data Sheet Jun/04