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MLX90614-EN(MLX90614-EN).pdf

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    MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 Features and Benefits Small size, low cost Easy to integrate Factory calibrated in wide temperature range: -40…+125˚C for sensor temperature and -70…+380˚C for object temperature. High accuracy of 0.5°C over wide temperature range (0…+50°C for both Ta and To) High (medical) accuracy calibration Measurement resolution of 0.02°C Single and dual zone versions SMBus compatible digital interface Customizable PWM output for continuous measurements versatility Automotive grade Ordering Information reading Available in 3V and 5V versions Simple adaptation for 8…16V applications Sleep mode for reduced power consumption Different package options for applications and Applications Examples High precision non-contact temperature measurements Thermal Comfort sensor for Mobile Air Conditioning control system Temperature sensing element for residential, commercial and industrial building air conditioning Industrial temperature control of moving parts Windshield defogging Automotive blind angle detection Temperature control in printers and copiers Home appliances with temperature control Healthcare Livestock monitoring Movement detection Multiple zone temperature control – up to 127 sensors can be read via common 2 wires Thermal relay / alert Body temperature measurement Part No. MLX90614 Temperature Code E (-40C...85C) K (-40C…125C) Package Code SF (TO-39) - Option Code - X X X (1) (2) (3) Standard part -000 Packing form -TU (1) Supply Voltage/ Accuracy A - 5V B - 3V C - Reserved D - 3V medical accuracy (2) Number of thermopiles: A – single zone B – dual zone C – gradient compensated* (3) Package options: A – Standard package B – Reserved C – 35° FOV D/E – Reserved F – 10° FOV G – Reserved H – 12° FOV (refractive lens) I – 5° FOV Example: MLX90614ESF-BAA-000-TU * : See page 2 1 Functional diagram 2 General Description MLX90614Axx: Vdd=4.5...5.5V J1 1 SCL Vz SCL MLX90614 U1 P W M SDA 2 SDA Vdd 4Vss C1 Vdd 3 GND 0.1uF CON1 C1 value and type may differ in different applications for optimum EMC MLX90614 connection to SMBus Figure 1: Typical application schematics 3901090614 Rev 008 The MLX90614 is an Infra Red thermometer for non contact temperature measurements. Both the IR sensitive thermopile detector chip and the signal conditioning ASSP are integrated in the same TO-39 can. Thanks to its low noise amplifier, 17-bit ADC and powerful DSP unit, a high accuracy and resolution of the thermometer is achieved. The thermometer comes factory calibrated with a digital PWM and SMBus (System Management Bus) output. As a standard, the 10-bit PWM to continuously transmit the measured temperature in range of -20…120˚C, with an output resolution of 0.14˚C. The factory default POR setting is SMBus. is configured Page 1 of 52 Data Sheet February 28, 2013
    MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 General description (continued) The MLX90614 is built from 2 chips developed and manufactured by Melexis: The Infra Red thermopile detector MLX81101 The signal conditioning ASSP MLX90302, specially designed to process the output of IR sensor. The device is available in an industry standard TO-39 package. Thanks to the low noise amplifier, high resolution 17-bit ADC and powerful DSP unit of MLX90302 high accuracy and resolution of the thermometer is achieved. The calculated object and ambient temperatures are available in RAM of MLX90302 with resolution of 0.01˚C. They are accessible by 2 wire serial SMBus compatible protocol (0.02°C resolution) or via 10-bit PWM (Pulse Width Modulated) output of the device. The MLX90614 is factory calibrated in wide temperature ranges: -40…125˚C for the ambient temperature and -70…380˚C for the object temperature. The measured value is the average temperature of all objects in the Field Of View of the sensor. The MLX90614 offers a standard accuracy of ±0.5˚C around room temperatures. A special version for medical applications exists offering an accuracy of ±0.2˚C in a limited temperature range around the human body temperature. It is very important for the application designer to understand that these accuracies are only guaranteed and achievable when the sensor is in thermal equilibrium and under isothermal conditions (there are no temperature differences across the sensor package). The accuracy of the thermometer can be influenced by temperature differences in the package induced by causes like (among others): Hot electronics behind the sensor, heaters/coolers behind or beside the sensor or by a hot/cold object very close to the sensor that not only heats the sensing element in the thermometer but also the thermometer package. This effect is especially relevant for thermometers with a small FOV like the xxC and xxF as the energy received by the sensor from the object is reduced. Therefore, Melexis has introduced the xCx version of the MLX90614. In these MLX90614xCx, the thermal gradients are measured internally and the measured temperature is compensated for them. In this way, the xCx version of the MLX90614 is much less sensitive to thermal gradients, but the effect is not totally eliminated. It is therefore important to avoid the causes of thermal gradients as much as possible or to shield the sensor from them. As a standard, the MLX90614 is calibrated for an object emissivity of 1. It can be easily customized by the customer for any other emissivity in the range 0.1…1.0 without the need of recalibration with a black body. The 10-bit PWM is as a standard configured to transmit continuously the measured object temperature for an object temperature range of -20…120˚C with an output resolution of 0.14˚C. The PWM can be easily customized for virtually any range desired by the customer by changing the content of 2 EEPROM cells. This has no effect on the factory calibration of the device. The PWM pin can also be configured to act as a thermal relay (input is To), thus allowing for an easy and cost effective implementation in thermostats or temperature (freezing / boiling) alert applications. The temperature threshold is user programmable. In a SMBus system this feature can act as a processor interrupt that can trigger reading all slaves on the bus and to determine the precise condition. The thermometer is available in 2 supply voltage options: 5V compatible or 3V (battery) compatible. The 5V can be easily adopted to operate from a higher supply voltage (8…16V, for example) by use of few external components (refer to “Applications information” section for details). An optical filter (long-wave pass) that cuts off the visible and near infra-red radiant flux is integrated in the package to provide ambient and sunlight immunity. The wavelength pass band of this optical filter is from 5.5 till 14µm (except for xCH and xCI type of devices which incorporate uncoated germanium lens). 3901090614 Rev 008 Page 2 of 52 Data Sheet February 28, 2013
    MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 3 Table of Contents 1 Functional diagram ............................................................................................................................................................................ 1 2 General Description ........................................................................................................................................................................... 1 3 Table of Contents .............................................................................................................................................................................. 3 4 Glossary of Terms ............................................................................................................................................................................. 4 5 Maximum ratings ............................................................................................................................................................................... 4 6 Pin definitions and descriptions .......................................................................................................................................................... 5 7 Electrical Specifications ..................................................................................................................................................................... 6 7.1 MLX90614Axx............................................................................................................................................................................ 6 7.2 MLX90614Bxx, MLX90614Dxx .................................................................................................................................................... 8 8 Detailed description ......................................................................................................................................................................... 10 8.1 Block diagram .......................................................................................................................................................................... 10 8.2 Signal processing principle........................................................................................................................................................ 10 8.3 Block description ...................................................................................................................................................................... 11 8.3.1 Amplifier............................................................................................................................................................................ 11 8.3.2 Supply regulator and POR.................................................................................................................................................. 11 8.3.3 EEPROM .......................................................................................................................................................................... 11 8.3.4 RAM ................................................................................................................................................................................. 14 8.4 SMBus compatible 2-wire protocol............................................................................................................................................. 14 8.4.1 Functional description ........................................................................................................................................................ 14 8.4.2 Differences with the standard SMBus specification (reference [1])......................................................................................... 15 8.4.3 Detailed description ........................................................................................................................................................... 15 8.4.4 Bit transfer ........................................................................................................................................................................ 16 8.4.5 Commands ....................................................................................................................................................................... 17 8.4.6 SMBus communication examples ....................................................................................................................................... 17 8.4.7 Timing specification ........................................................................................................................................................... 18 8.4.8 Sleep Mode....................................................................................................................................................................... 19 8.4.9 MLX90614 SMBus specific remarks.................................................................................................................................... 20 8.5 PWM ....................................................................................................................................................................................... 21 8.5.1 Single PWM format............................................................................................................................................................ 22 8.5.2 Extended PWM format ....................................................................................................................................................... 23 8.5.3 Customizing the temperature range for PWM output ............................................................................................................ 24 8.6 Switching Between PWM / Thermal relay and SMBus communication ......................................................................................... 26 8.6.1 PWM is enabled ................................................................................................................................................................ 26 8.6.2 Request condition .............................................................................................................................................................. 26 8.6.3 PWM is disabled................................................................................................................................................................ 26 8.7 Computation of ambient and object temperatures ....................................................................................................................... 27 8.7.1 Ambient temperature Ta..................................................................................................................................................... 27 8.7.2 Object temperature To ....................................................................................................................................................... 27 8.7.3 Calculation flow ................................................................................................................................................................. 28 8.8 Thermal relay ........................................................................................................................................................................... 30 9 Unique Features.............................................................................................................................................................................. 31 10 Performance Graphs...................................................................................................................................................................... 32 10.1 Temperature accuracy of the MLX90614 .................................................................................................................................. 32 10.1.1 Standard accuracy........................................................................................................................................................... 32 10.1.2 Medical accuracy ............................................................................................................................................................. 33 10.1.3 Temperature reading dependence on VDD ......................................................................................................................... 33 10.2 Field Of View (FOV)................................................................................................................................................................ 35 11 Applications Information ................................................................................................................................................................. 39 11.1 Use of the MLX90614 thermometer in SMBus configuration ...................................................................................................... 39 11.2 Use of multiple MLX90614s in SMBus configuration.................................................................................................................. 39 11.3 PWM output operation ............................................................................................................................................................ 40 11.4 Thermal alert / thermostat ....................................................................................................................................................... 40 11.5 High voltage source operation ................................................................................................................................................. 41 12 Application Comments ................................................................................................................................................................... 42 13 Standard information regarding manufacturability of Melexis products with different soldering processes ............................................ 44 14 ESD Precautions ........................................................................................................................................................................... 44 15 FAQ.............................................................................................................................................................................................. 45 16 Package Information ...................................................................................................................................................................... 47 16.1 MLX90614xxA ........................................................................................................................................................................ 47 16.2 MLX90614xCC ....................................................................................................................................................................... 47 16.3 MLX90614xCF ....................................................................................................................................................................... 48 16.4 MLX90614xCH ....................................................................................................................................................................... 48 16.5 MLX90614xCI ........................................................................................................................................................................ 49 16.6 Part marking........................................................................................................................................................................... 49 16.7 Operating and storage humidity range...................................................................................................................................... 49 17 Table of figures.............................................................................................................................................................................. 50 18 References ................................................................................................................................................................................... 51 19 Disclaimer ..................................................................................................................................................................................... 51 3901090614 Rev 008 Data Sheet February 28, 2013 Page 3 of 52
    MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 4 Glossary of Terms PTAT POR HFO DSP FIR IIR IR PWM DC FOV SDA,SCL Ta To ESD EMC ASSP TBD Proportional To Absolute Temperature sensor (package temperature) Power On Reset High Frequency Oscillator (RC type) Digital Signal Processing Finite Impulse Response. Digital filter Infinite Impulse Response. Digital filter Infra-Red Pulse With Modulation Duty Cycle (of the PWM) ; Direct Current (for settled conditions specifications) Field Of View Serial DAta, Serial CLock – SMBus compatible communication pins Ambient Temperature measured from the chip – (the package temperature) Object Temperature, ‘seen’ from IR sensor Electro-Static Discharge Electro-Magnetic Compatibility Application Specific Standard Product To Be Defined Note: sometimes the MLX90614xxx is referred as “the module”. 5 Maximum ratings Parameter MLX90614ESF-Axx 7V 5.5 V Supply Voltage, VDD (over voltage) Supply Voltage, VDD (operating) Reverse Voltage Operating Temperature Range, TA Storage Temperature Range, TS ESD Sensitivity (AEC Q100 002) DC current into SCL / Vz (Vz mode) DC sink current, SDA / PWM pin DC source current, SDA / PWM pin DC clamp current, SDA / PWM pin DC clamp current, SCL pin -40…+85C -40…+125C 5V 3.6V 0.4 V 2kV 2 mA 25 mA 25 mA 25 mA 25 mA MLX90614ESF-Bxx MLX90614ESF-Dxx MLX90614KSF-Axx 7V 5.5V -40…+125°C -40…+125°C Table 1: Absolute maximum ratings for MLX90614 Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. 3901090614 Rev 008 Page 4 of 52 Data Sheet February 28, 2013
    MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 6 Pin definitions and descriptions 4 - VSS 1 - SCL / Vz 3 - VDD 2 - SDA / PWM Bottom view Figure 2: Pin description Function Serial clock input for 2 wire communications protocol. 5.7V zener is available at this pin for connection of external bipolar transistor to MLX90614Axx to supply the device from external 8 …16V source. Digital input / output. In normal mode the measured object temperature is available at this pin Pulse Width Modulated. In SMBus compatible mode the pin is automatically configured as open drain NMOS. External supply voltage. Ground. The metal can is also connected to this pin. Table 2: Pin description MLX90614 Pin Name SCL / Vz SDA / PWM VDD VSS Note: for +12V (+8…+16V) powered operation refer to the Application information section. For EMC and isothermal conditions reasons it is highly recommended not to use any electrical connection to the metal can except by the VSS pin. With the SCL / Vz and PWM / SDA pins operated in 2-wire interface mode, the input Schmidt trigger function is automatically enabled. 3901090614 Rev 008 Page 5 of 52 Data Sheet February 28, 2013
    MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 7 Electrical Specifications 7.1 MLX90614Axx All parameters are valid for TA = 25 ˚C, VDD =5V (unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Units External supply Supply current Supply current (programming) Zener voltage VDD IDD IDDpr Vz Zener voltage Vz(Ta) POR level POR level POR hysteresis VDD rise time (10% to 90% of specified supply voltage) Output valid (result in RAM) VPOR_up VPOR_down VPOR_hys TPOR Tvalid PWM resolution PWM output period PWMres PWMT,def PWM period stability dPWMT Supplies No load No load, erase/write EEPROM operations Iz = 75…1000A (Ta=room) Iz = 70…1000A, full temperature range Power On Reset Power-up (full temp range) Power –down (full temp range) Full temp range Ensure POR signal After POR Pulse width modulation1 Data band Factory default, internal oscillator factory calibrated Internal oscillator factory calibrated, over the entire operation range and supply voltage Output high Level Output low Level Output drive current Output sink current Continued on next page PWMHI PWMLO IdrivePWM IsinkPWM Isource = 2 mA Isink = 2 mA Vout,H = VDD - 0.8V Vout,L = 0.8V 4.5 5.5 5.15 1.4 1.3 0.08 -10 VDD-0.2 5 1.3 1.5 5.7 5.7 1.75 1.7 0.1 0.25 10 1.024 7 13.5 5.5 2 2.5 5.9 6.24 1.95 1.9 1.15 20 V mA mA V V V V V ms s bit ms +10 % VSS+0.2 V V mA mA 3901090614 Rev 008 Page 6 of 52 Data Sheet February 28, 2013
    MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 Parameter Symbol Test Conditions Min Typ Max SMBus compatible 2-wire interface2 Input high voltage Input low voltage VIH (Ta, V) VIL (Ta, V) Over temperature and supply Over temperature and supply Output low voltage VOL Over temperature and supply, Isink = 2mA SCL leakage SDA leakage SCL capacitance SDA capacitance Slave address Wake up request SMBus Request Timeout, low Timeout, high Acknowledge setup time Acknowledge hold time Acknowledge setup time Acknowledge hold time Data retention Erase/write cycles Erase/write cycles Erase cell time Write cell time ISCL, leak ISDA, leak VSCL=4V, Ta=+85°C VSDA=4V, Ta=+85°C CSCL CSDA SA twake tREQ Timeout,L Timeout,H Tsuac(MD) Thdac(MD) Tsuac(SD) Thdac(SD) Terase Twrite Factory default SDA low SCL low SCL low SCL high 8-th SCL falling edge, Master 9-th SCL falling edge, Master 8-th SCL falling edge, Slave 9-th SCL falling edge, Slave EEPROM Ta = +85°C Ta = +25°C Ta = +125°C 3 33 1.44 27 45 10 100,000 10,000 5A 5 5 Table 3: Electrical specification MLX90614Axx 0.6 0.2 30 0.3 10 10 33 55 1.5 1.5 2.5 1.5 Units V V V A A pF pF hex ms ms ms s s s s s years Times Times ms ms Notes: All the communication and refresh rate timings are given for the nominal calibrated HFO frequency and will vary with this frequency’s variations. 1. With large capacitive load lower PWM frequency is recommended. Thermal relay output (when configured) has the PWM DC specification and can be programmed as push-pull, or NMOS open drain. PWM is free-running, power-up factory default is SMBus, refer to section 8.6, “Switching between PWM and SMBus communication” for more details. 2. For SMBus compatible interface on 12V application refer to Application information section. SMBus compatible interface is described in details in the SMBus detailed description section. Maximum number of MLX90614 devices on one bus is 127, higher pull-up currents are recommended for higher number of devices, faster bus data transfer rates, and increased reactive loading of the bus. MLX90614 is always a slave device on the bus. MLX90614 can work in both low-power and high-power SMBus communication. All voltages are referred to the Vss (ground) unless otherwise noted. Sleep mode is not available on the 5V version (MLX90614Axx). 3901090614 Rev 008 Page 7 of 52 Data Sheet February 28, 2013
    MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 7.2 MLX90614Bxx, MLX90614Dxx All parameters are valid for TA = 25 ˚C, VDD =3V (unless otherwise specified) Parameter Symbol External supply Supply current Supply current (programming) Sleep mode current Sleep mode current POR level POR level POR hysteresis VDD rise time (10% to 90% of specified supply voltage) Output valid VDD IDD IDDpr Isleep Isleep VPOR_up VPOR_down VPOR_hys TPOR Tvalid Test Conditions Supplies No load No load, erase / write EEPROM operations no load Full temperature range Power On Reset Power-up (full temp range) Power –down (full temp range) Full temp range Ensure POR signal After POR Pulse width modulation1 PWM resolution PWMres Data band PWM output period PWMT,def PWM period stability dPWMT Output high Level Output low Level Output drive current Output sink current Continued on next page PWMHI PWMLO IdrivePWM IsinkPWM Factory default, internal oscillator factory calibrated Internal oscillator factory calibrated, over the entire operation range and supply voltage Isource = 2 mA Isink = 2 mA Vout,H = VDD - 0.8V Vout,L = 0.8V Min 2.6 1 1 1.4 1.3 0.08 Typ 3 1.3 1.5 2.5 2.5 1.75 1.7 0.1 Max Units 3.6 2 2.5 5 6 1.95 1.9 1.15 V mA mA A A V V V 20 ms 0.25 10 1.024 s bit ms -10 VDD-0.25 4.5 11 +10 % VSS+0.25 V V mA mA 3901090614 Rev 008 Page 8 of 52 Data Sheet February 28, 2013
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