mlx90615 Melexis Company, mlx90615 Datasheet
mlx90615
Available stocks
Related parts for mlx90615
mlx90615 Summary of contents
Page 1
... Package Code SG (TO-46) E (-40°C to 85°C) 2 General Description The MLX90615 is an Infra Red thermometer for non contact temperature measurements. Both the IR sensitive thermopile detector chip and the signal conditioning chip are integrated in the same TO-46 can package. Thanks to its low noise amplifier, 16-bit ADC and powerful DSP unit, a high accuracy and resolution of the thermometer is achieved ...
Page 2
... The MLX90615 is factory calibrated in standard temperature ranges from: -40 to 85˚C for the ambient temperature and from -40 to 115˚C for the object temperature standard, the MLX90615 is delivered with a programmed object emissivity 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 ...
Page 3
... Unique Features........................................................................................................................................................................................20 10 Performance Graphs...............................................................................................................................................................................20 10.1 Temperature accuracy of the MLX90615 ........................................................................................................................................20 10.2 Field Of View (FOV) ........................................................................................................................................................................21 11 Applications Information..........................................................................................................................................................................22 11.1 Use of the MLX90615 thermometer in SMBus configuration ..........................................................................................................22 11.2 Use of multiple MLX90615s in SMBus configuration.......................................................................................................................22 11.3 PWM output.....................................................................................................................................................................................23 12 Application Comments ............................................................................................................................................................................24 13 Standard information regarding manufacturability of Melexis products with different soldering processes............................................25 14 ESD Precautions ...
Page 4
... ESD Sensitivity (AEC Q100 002) DC sink current, SDA pin DC clamp current, SDA pin DC clamp current, SCL pin Table 1: Absolute maximum ratings for MLX90615 Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute-maximum- rated conditions for extended periods may affect device reliability. 3901090615 ...
Page 5
... Pin definitions and descriptions 2 - VDD 3 - SCL Top view Figure 2: Pin description MLX90615 Pin Name VSS SCL SDA/PWM VDD Notes: For EMC and isothermal conditions reasons highly recommended not to use any electrical connection to the metal can except by the Vss pin. The SDA pin is an input Schmidt trigger when the thermometer is operated in the 2-wire SMBus interface mode ...
Page 6
... Data band Factory default high frequency PWM, HFO factory calibrated Low frequency PWM, HFO factory calibrated Internal oscillator factory calibrated, over the entire operation range and supply voltage sink Vout,L = 0.5V Page MLX90615 Infra Red Thermometer Min Typ Max Units 2.6 3 3.6 V 0.8 1 ...
Page 7
... SMBus detailed description section. Maximum number of MLX90615 devices on one bus is 127, higher pullup currents are recommended for higher number of devices, faster bus data transfer rates, and increased reactive loading of the bus. ...
Page 8
... MLX90325 MLX90615 8.2 Signal processing principle A DSP embedded in the MLX90615 controls the measurements, calculates object and ambient temperatures and does the post-processing of the temperatures to output them through SMBus compatible interface or PWM (whichever activated). The output of the IR sensor is amplified by a low noise, low offset chopper amplifier with programmable gain, then converted by a Sigma Delta modulator to a single bit stream and fed to the DSP for further processing ...
Page 9
... POR signal when the Vdd voltage rises above approximately 0.5V and holds the entire MLX90615 in reset until the Vdd is higher than the specified POR threshold V signal is available as a weak open drain (active high) at the SDA pin. After the MLX90615 exits the POR state, the functions programmed in the EEPROM take control of that pin. ...
Page 10
... The MD has read access to the RAM and EEPROM and write access to 14 EEPROM cells (at addresses 0..Dh). If the access to the MLX90615 is a read operation, it will respond with 16 data bits and 8 bit PEC only if its own slave address, programmed in the internal EEPROM, is equal to the SA, sent by the master. The SA feature allows connecting up to 127 devices with 2 wires, unless the system has some of the specific features described in paragraph 5 ...
Page 11
... Write Word 8.4.3 Detailed description The SDA pin of the MLX90615 can operate also as a PWM output, depending on the EEPROM settings. If PWM is enabled, after POR the SDA pin is directly configured as a PWM output. The PWM mode can be avoided and the pin can be restored to its Serial Data function by issuing SMBus request condition. If SMBus is the POR default, the request does not have to be sent ...
Page 12
... Data Byte A Figure 5: SMBus packet element key Command Data Byte High A A Figure 6: SMBus read word format Page MLX90615 Infra Red Thermometer ……….. Slave Address PEC A P Data Sheet ...
Page 13
... Tsuac(SD) is the time after the eighth falling edge of SCL during which the MLX90615 will force SDA low to acknowledge the last received byte. Thdac(SD) is the time after the ninth falling edge of SCL during which the MLX90615 will release the SDA (so the MD can continue with the communication). ...
Page 14
... MLX90615 can enter Sleep Mode via command “Enter SLEEP mode” sent via the SMBus interface. MLX90615 goes back into power-up default mode by forcing the SCL pin low for at least t from Sleep is always in SMBus mode. Valid data will be available typically 0.3 seconds after the device has woken up ...
Page 15
... PWM function. The SCL pin has on-chip a weak pull-up. SCL SDA/PWM Figure 12: Switching from PWM mode to SMBus 3901090615 Rev 001 Figure 11: Detailed Sleep command t REQ PWM Start Page MLX90615 Infra Red Thermometer Stop SMBus Data Sheet 28/Aug/2008 ...
Page 16
... Request condition Figure 13: Request (switch to SMBus) condition If PWM is enabled, the MLX90615’s SMBus Request condition is needed to disable PWM and reconfigure SDA/PWM pin before starting SMBus communication. Once disabled, PWM can only be enabled by switching the supply Off-On. The MLX90615’s SMBus request condition requires forcing the SCL pin LOW for a period longer than the request time (t 8 ...
Page 17
... PWM The MLX90615 can be read via PWM or SMBus compatible interface. Selection of PWM output is done in EEPROM configuration (factory default is SMBus). Object or ambient temperature can be read through PWM. The PWM period is derived from the on-chip oscillator and is programmable in a low or high frequency. Config Register[2:0] ...
Page 18
... LSB MIN MIN EEPORM = ∗ LSB MAX MAX EEPORM 3901090615 Rev 001 T = RANGE EEPROM 1023 [°C], 3FFh corresponds to PWM T MIN MIN [° MAX = MIN + RANGE Page MLX90615 Infra Red Thermometer [°C] MAX Data Sheet 28/Aug/2008 ...
Page 19
... Object temperature To The result has a resolution of 0.02 ˚C and is available in RAM (address 7h derived from RAM as: 3901090615 Rev 001 Infra Red Thermometer ( ) ( ) = − ° = × Tareg ° = × Toreg Page MLX90615 Data Sheet 28/Aug/2008 ...
Page 20
... Unique Features The MLX90615 is a ready-to use low-cost non contact thermometer provided by Melexis with output data linearly dependent on the object temperature with high accuracy and extended resolution. The user can program the internal object emissivity correction for objects with a low emissivity. ...
Page 21
... To Figure 16: Preliminary accuracy of MLX90615ESG-DAA (Ta,To) for medical applications. 10.2 Field Of View (FOV) Field of view is determined at 50% thermopile signal and with respect to the sensor main axis. Parameter Peak direction FOV width 1.0 0.8 0.5 0.3 0.0 -80° -70° -60° -50° -40° -30° -20° -10° 3901090615 ...
Page 22
... Figure 19: Use of multiple MLX90615 devices in SMBus network The MLX90615 supports a 7-bit slave address in EEPROM, thus allowing up to 127 devices to be read via two common wires. Current source pull-ups may be preferred with higher capacitive loading on the bus (C3 and C4 represent the lines’ parasitics), while simple resistive pull-ups provide the obvious low cost advantage ...
Page 23
... Therefore external pull-up is required for high level state on the line with longer wires. Simple level shifting is possible with a single resistor. ESD protective clamp on the SDA pin consists of 4 diodes to Vdd, thus allowing high level disregarding the MLX90615 supply voltage value. 2 ...
Page 24
... For ESD protection there are clamp diodes between the Vss and Vdd and each of the other pins. This means that the MLX90615 might draw current from a bus in case the SCL and/or SDA is connected and the Vdd is lower than the bus pull-ups’ voltage. ...
Page 25
... Melexis is contributing to global environmental conservation by promoting lead free solutions. For more information on qualifications of RoHS compliant products (RoHS = European directive on the Restriction Of the use of certain Hazardous Substances) please visit the quality page on our website: http://www.melexis.com/quality.asp The MLX90615 is RoHS compliant 3901090615 Rev 001 Infra Red Thermometer ...
Page 26
... IR material reflectivity equals 1.00 minus emissivity) the bigger errors it produces. After I put the MLX90615 in the dashboard I start getting errors larger than specified in spite that the module was working properly before that. Why? Any object present in the FOV of the module provides IR signal ...
Page 27
... Even more, the glass (in most cases) is not transparent to the IR radiation used by the MLX90615. Glass has temperature and really high emissivity in most cases – “black” for IR of interest. Overall, Sun behind a window is most likely to introduce relatively small errors. Why is it not completely eliminated after all? Even visible light partially absorbed in the filter of the sensor has some heating potential – ...
Page 28
... Package Information 3901090615 Rev 001 Figure 21: MLX90615 package drawing Page MLX90615 Infra Red Thermometer Data Sheet 28/Aug/2008 ...
Page 29
... For the latest version of this document our website at Or for additional information contact Melexis Direct: Europe, Africa, Asia: Phone: +32 1367 0495 E-mail: sales_europe@melexis.com 3901090615 Rev 001 www.melexis.com America: Phone: +1 603 223 2362 E-mail: sales_usa@melexis.com ISO/TS 16949 and ISO14001 Certified Page MLX90615 Infra Red Thermometer Data Sheet 28/Aug/2008 ...
Page 30
... Updates – FOV, package, EEPROM, specification, watermark Regenerated as revision 0 for official release Text clarifications, added IRData RAM address, changed Vdd range, added Idd,max, remade package drawing. 3901090615 Rev 001 Changes Page MLX90615 Infra Red Thermometer Remark Date Preliminary Release Not on doc- server Update ...