MLX90615ESG-DAA Melexis Inc, MLX90615ESG-DAA Datasheet
MLX90615ESG-DAA
Specifications of MLX90615ESG-DAA
Related parts for MLX90615ESG-DAA
MLX90615ESG-DAA Summary of contents
Page 1
... Ta and To) High (medical) accuracy calibration Measurement resolution of 0.02°C SMBus compatible digital interface Power saving mode Customizable PWM output for continuous reading Embedded emissivity compensation 3V supply voltage Ordering Information Part No. MLX90615 Example : MLX90615ESG-DAA 1 Functional diagram MLX90615 Vss SCL SDA SCL SDA 1 3 ...
Page 2
General description (continued) The MLX90615 is built from 2 chips, the Infra Red thermopile detector and the signal conditioning chip MLX90325, specially designed by Melexis to process the output of IR sensor. The device is available in an industry standard ...
Page 3
Table of Contents 1 Functional diagram......................................................................................................................................................................................1 2 General Description ....................................................................................................................................................................................1 General description (continued).....................................................................................................................................................................2 3 Table of Contents........................................................................................................................................................................................3 4 Glossary of Terms.......................................................................................................................................................................................4 5 Maximum ratings.........................................................................................................................................................................................4 6 Pin definitions and descriptions ..................................................................................................................................................................5 7 Electrical Specifications ..............................................................................................................................................................................6 8 Detailed description.....................................................................................................................................................................................8 8.1 Block ...
Page 4
Glossary of Terms PTAT Proportional To Absolute Temperature sensor (package temperature) POR Power On Reset HFO High Frequency Oscillator (RC) DSP Digital Signal Processing FIR Finite Impulse Response. Digital filter IIR Infinite Impulse Response. Digital filter IR Infra-Red DC ...
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 ...
Page 6
Electrical Specifications All parameters are preliminary for T Parameter Symbol External supply V DD Supply current I DD Supply current I DDpr (programming) Power-down supply Isleep current POR level V POR V rise time T DD POR Output valid ...
Page 7
Parameter Symbol Input high voltage V IH Input high voltage V (Ta,V) IH Input low voltage V IL Input low voltage V (Ta,V) IL Output low voltage V OL SCL,SDA leakage I leak SCL capacitance C SCL SDA capacitance C ...
Page 8
Detailed description 8.1 Block diagram IR sensor t° 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 ...
Page 9
Power-On-Reset (POR) The Power On Reset (POR) is connected to the Vdd supply. The on-chip POR circuit provides an active level of the POR signal when the Vdd voltage rises above approximately 0.5V and holds the entire MLX90615 in ...
Page 10
Emissivity: Contains the value for object emissivity correction. The MLX90615 will compensate for the emissivity of the object measured with respect to that value. The equation for that register is Emissivity = dec2hex[round(16384 x ,where dec2hex[round(X)] represents decimal to hexadecimal ...
Page 11
Special care must be taken not to put two MLX90615 devices with the same SD addresses on the same bus as MLX90615 does not support ARP[1]. The MD can force the MLX90615 into low consumption mode “sleep mode”. 8.4.2 Differences ...
Page 12
Bus Protocol 1 7 Slave Address S S Start Condition Sr Repeated Start Condition Rd Read (bit value Write (bit value Acknowledge (this bit can be 0 for ACK and 1 for NACK) ...
Page 13
Write Word (EEPROM only Slave Address 8 1 ……….. Data Byte Low A Note: Before a write operation takes place, the EEPROM cell needs to be erased. An erase operation is simply a write of 0000h at ...
Page 14
Bit transfer SCL PWM/SDA The data on SDA must be changed when SCL is low (min 300ns after the falling edge of SCL). The data is fetched by both MD and SDs on the rising edge of the SCL. ...
Page 15
SCL needs to be high during Sleep. SDA can idle in each state at the same time, but the high state is recommended as the pull-up does not add current drain. There are weak pull-ups on both SCL and SDA ...
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 ...
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 ...
Page 18
Customizing the temperature range for PWM output The calculated ambient and object temperatures are stored in RAM with a resolution of 0.02 °C (15 bit). The PWM operates with a 10-bit number so the transmitted temperature is rescaled in ...
Page 19
Principle of operation The IR sensor consists of series connected thermo-couples with cold junctions placed at thick chip substrate and hot junctions, placed over thin membrane. The IR radiation absorbed from the membrane heats (or cools) it. The thermopile ...
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 ...
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° ...
Page 22
Applications Information 11.1 Use of the MLX90615 thermometer in SMBus configuration Vdd 2 C1 0.1uF Figure 18: Connection of MLX90615 to SMBus. MLX90615 has diode clamps SDA/SCL to Vdd necessary to provide MLX90615 with power in ...
Page 23
PWM output With PWM output configuration MLX90615 can be read via single wire. Output is open drain NMOS (with a weak pull-up, 300 kΩ typ). Therefore external pull-up is required for high level state on the line with longer ...
Page 24
Application Comments Significant contamination at the optical input side (sensor filter) might cause unknown additional filtering/distortion of the optical signal and therefore result in unspecified errors. IR sensors are inherently susceptible to errors caused by thermal gradients. There are ...
Page 25
Standard information regarding manufacturability of Melexis products with different soldering processes Our products are classified and qualified regarding soldering technology, solderability and moisture sensitivity level according to following test methods: Reflow Soldering SMD’s (Surface Mount Devices) • IPC/JEDEC J-STD-020 ...
Page 26
ESD Precautions Electronic semiconductor products are sensitive to Electro Static Discharge (ESD). Always observe Electro Static Discharge control procedures whenever handling semiconductor products. 15 FAQ When I measure aluminium and plastic parts settled at the same conditions I get ...
Page 27
When a hot (cold) air stream hits my MLX90615 some error adds to the measured temperature I read. What is it? IR sensors are inherently sensitive to difference in temperatures between the sensitive element and everything incident to that element. ...
Page 28
Package Information 3901090615 Rev 001 Figure 21: MLX90615 package drawing Page MLX90615 Infra Red Thermometer Data Sheet 28/Aug/2008 ...
Page 29
References [1] System Management Bus (SMBus) Specification Version 2.0 August 3, 2000 SBS Implementers Forum Copyright . 1994, 1995, 1998, 2000 Duracell, Inc., Energizer Power Systems, Inc., Fujitsu, Ltd., Intel Corporation, Linear Technology Inc., Maxim Integrated Products, Mitsubishi Electric ...
Page 30
Revisions Table Version 001 002 Updates – Sleep mode, packaging, EEPROM 003 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. ...