MLX90614ESF-AAB

Manufacturer Part NumberMLX90614ESF-AAB
DescriptionSingle and Dual Zone
ManufacturerETC2 [List of Unclassifed Manufacturers]
MLX90614ESF-AAB datasheet
 


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Features and Benefits
Small size, low cost
Easy to integrate
Factory calibrated in wide temperature range:
-40 to 125 ˚C for sensor temperature and
-70 to 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
reading
Available in 3V and 5V versions
Simple adaptation for 8 to 16V applications
Power saving mode
Different package options for applications and
measurements versatility
Automotive grade
Ordering Information
Part No.
MLX90614
(1) Supply Voltage/
Acccuracy
A - 5V
B - 3V
C - Reserved
D - 3V medical accuracy
Example:
MLX90614ESF-BAA
1 Functional diagram
MLX90614Axx: Vdd=4.5...5.5V
J1
1
MLX90614
SCL
U1
SCL
Vz
P W M
4
Vss
SDA
SDA
2
Vdd
Vdd
C1
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 003
MLX90614 family
Infra Red Thermometer in TO-39
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;
Windshield defogging;
Automotive blind angle detection;
Industrial temperature control of moving parts;
Temperature control in printers and copiers;
Home appliances with temperature control;
Healthcare;
Livestock monitoring;
Movement detection;
Multiple zone temperature control – up to 100
sensors can be read via common 2 wires
Thermal relay/alert
Body temperature measurement
Temperature Code
Package Code
SF (TO-39)
E (-40°C to 85°C)
K (-40°C to 125°C)
(2) Number of thermopiles:
A – single zone
B – dual zone
2 General Description
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 is configured to
continuously transmit the measured temperature in range
of -20 to 120 ˚C, with an output resolution of 0.14 ˚C and
the POR default is SMBus.
Page 1 of 40
Single and Dual Zone
- Option Code
- X X X
(1) (2) (3)
(3) Package options:
A – Standard package
B – Reserved
C – 35° FOV
Data Sheet
03/Oct/2007

MLX90614ESF-AAB Summary of contents

  • Page 1

    ... Power saving mode Different package options for applications and measurements versatility Automotive grade Ordering Information Part No. MLX90614 (1) Supply Voltage/ Acccuracy Reserved medical accuracy Example: MLX90614ESF-BAA 1 Functional diagram MLX90614Axx: Vdd=4.5...5. MLX90614 SCL U1 SCL Vss SDA SDA ...

  • Page 2

    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 ...

  • 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 7.1 MLX90614Axx .....................................................................................................................................................................................6 7.2 ...

  • Page 4

    ... Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute-maximum- rated conditions for extended periods may affect device reliability. 3901090614 Rev 003 MLX90614 family Infra Red Thermometer in TO-39 MLX90614ESF-Axx MLX90614ESF-Bxx MLX90614ESF-Dxx 7V 5.5 V -40…+85°C -40…+125°C Page Single and Dual Zone MLX90614KSF-Axx ...

  • Page 5

    Pin definitions and descriptions 2 - PWM/ SDA 3 - VDD Top view Pin Name VSS SCL / Vz PWM / SDA VDD Note: for +12V (+8…+16V) powered operation refer to the Application information section. For EMC and isothermal ...

  • Page 6

    Electrical Specifications 7.1 MLX90614Axx All parameters are preliminary for T Parameter Symbol External supply Supply current Supply current (programming) Zener voltage Zener voltage Vz(Ta) POR level V rise time DD Output valid (result in RAM) Tvalid PWM resolution PWMres ...

  • Page 7

    Parameter Symbol Input high voltage Input high voltage V IH Input low voltage Input low voltage V IL Output low voltage SCL leakage I SCL SDA leakage I SDA SCL capacitance SDA capacitance Slave address SMBus Request t REQ Timeout, ...

  • Page 8

    MLX90614Bxx , MLX90614Dxx 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 Power-down supply Isleep current POR level V POR V rise time ...

  • Page 9

    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 leakage I ,leak SCL SDA leakage I ,leak SDA SCL ...

  • Page 10

    Detailed description 8.1 Block diagram 81101 90302 8.2 Signal processing principle The operation of the MLX90614 is controlled by an internal state machine, which controls the measurements and calculations of the object and ambient temperatures and does the post-processing ...

  • Page 11

    Block description 8.3.1 Amplifier A low noise low offset amplifier with programmable gain is implemented for amplification of the IR sensor voltage. With a carefully designed input modulator and balanced input impedance, an offset as low as 0.5µV is ...

  • Page 12

    The address PWMCTRL consists of control bits for configuring the PWM/SDA pin: Bit 0 Select the type of PWM mode: Bit 1 Enable/disable the PWM: Bit 2 Configuration of the pin PWM: Bit 3 Mode selection Bits[8:4] Extemded PWM definition ...

  • Page 13

    RAM It is not possible to write into the RAM memory. It can only be read and only a limited number of RAM registers are of interest to the customer. Melexis reserved … Melexis reserved Melexis ...

  • Page 14

    Differences with the standard SMBus specification (reference [1]) There are eleven command protocols for standard SMBus interface. The MLX90614 supports only two of them. Not supported commands are: • Quick Command • Byte commands - Sent Byte, Receive Byte, ...

  • Page 15

    Read Word (depending on the command – RAM or EEPROM Slave Address Wr 8 ……….. Data Byte Low 8.4.3.1.2 Write Word (depending on the command – RAM or EEPROM Slave Address 8 ……….. ...

  • Page 16

    The indexes MD and SD for the latest timings are used – MD when the master device is making acknowledge; SD when the slave device is making acknowledge-. For other timings see [1]. SCL PWM/SDA 8.4.5 Bit transfer The data ...

  • Page 17

    Sleep Mode The MLX90614 can enter in Sleep Mode via the command “Enter SLEEP mode” sent via the SMBus interface. This mode is not available for the 5V supply version. To limit the current consumption to 2.5uA (typical), the ...

  • Page 18

    PWM The MLX90614 can be read via PWM or SMBus compatible interface. Selection of PWM output is done in EEPROM configuration (factory default is SMBus). PWM output has two programmable formats, single and dual data transmission, providing single wire ...

  • Page 19

    The different time intervals t -t have the following functions Start buffer. During this time the signal is always high Valid Data Output Band 1/2T. PWM output data resolution is ...

  • Page 20

    Customizing the temperature range for PWM output The calculated ambient and object temperatures are stored in RAM with a resolution of 0.01 °C (16 bit). The PWM operates with a 10-bit word so the transmitted temperature is rescaled in ...

  • Page 21

    Switching Between PWM and SMBus communication 8.6.1 PWM is enabled The diagram below illustrates the way of switching to SMBus if PWM is enabled (factory programmed POR default for MLX90614 is SMBus, PWM disabled). Note that the SCL pin ...

  • Page 22

    Computation of ambient and object temperatures The IR sensor consists of serial 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) ...

  • Page 23

    Gain measurement with fixed length FIR filter Offset compensation Additional gain filtering with fixed length IIR, storing the result into RAM as IR Gain compensation calculation, the result is stored into RAM as K Object temperature: IR1 sensor: IR sensor ...

  • Page 24

    Thermal relay The MLX90614 can be configured to behave as a thermo relay with programmable threshold and hysteresis on the PWM/SDA pin. The input for the comparator unit of the relay is the object temperature from sensor 1 The ...

  • Page 25

    Unique Features The MLX90614 is a ready-to use low-cost non contact thermometer provided from Melexis with output data linearly dependent on the object temperature with high accuracy and extended resolution. It supports versatile customization to a very wide range ...

  • Page 26

    Performance Graphs 10.1 Temperature accuracy of the MLX90614 380 o To, C 300 240 o ± 180 o ± ± 3 120 o ± ± ± ± 1 ...

  • Page 27

    A version of the MLX90614 with accuracy suited for medical applications is available. The accuracy in the range Ta 10ºC - 40ºC and To 32ºC - 42ºC is shown in diagram below. The accuracy for the rest of the temperature ...

  • Page 28

    Field Of View (FOV) Field of view is determined at 50% thermopile signal and with respect to the sensor main axis. Parameter Peak zone 1 Width zone 1 Peak zone 2 Width zone 2 1.00 0.75 0.50 0.25 0.00 ...

  • Page 29

    Figure 21: FOV of MLX90614xAC 3901090614 Rev 003 MLX90614 family Infra Red Thermometer in TO-39 Angle, Deg 0° 20° 40° 60° Page Single and Dual Zone 80° Data ...

  • Page 30

    Applications Information 11.1 Use of the MLX90614 thermometer in SMBus configuration C1 0.1uF Connection of the MLX90614 to SMBus with 3.3V power supply. The MLX90614 has diode clamps SDA/SCL to Vdd necessary to provide MLX90614 with ...

  • Page 31

    PWM output operation Using the PWM output mode of the MLX90614 is very simple, as shown on Figure 24. Figure 24: Connection of MLX90614 for PWM output mode The PWM mode is free-running after POR when configured in EEPROM. ...

  • Page 32

    The PWM/SDA pin can be programmed as a push-pull or open drain NMOS, which can trigger an external device, such as a relay (refer to electrical specifications for load capability), buzzer, RF transmitter or a LED. This feature allows ...

  • Page 33

    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 34

    In case of using the MLX90614Axx internal zener voltage feature, the regulating external transistor should also not cause heating of the TO39 package. High capacitive load on a PWM line will result in significant charging currents from the ...

  • Page 35

    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: Wave Soldering THD’s (Through Hole Devices) • EIA/JEDEC JESD22-B106 ...

  • Page 36

    FAQ When I measure aluminum and plastic parts settled at the same conditions I get significant errors on aluminum. Why? Different materials have different emissivity. A typical value for aluminum (roughly polished) is 0.18 and for plastics values of ...

  • Page 37

    This is real optical signal that can not be segregated from the target IR signal and will add errors to the measured temperature. Thermal gradients with impact of that kind are likely ...

  • Page 38

    Package Information 16.1 MLX90614XXA The MLX90614 is packaged in an industry standard TO – 39 can. Note: 1. All dimensions are in mils [mm] 2. ØA = 3.5 mm 3901090614 Rev 003 MLX90614 family Infra Red Thermometer in TO-39 ...

  • Page 39

    MLX90614XXC 3901090614 Rev 003 MLX90614 family Infra Red Thermometer in TO-39 Figure 29: MLX90614XXC package Page Single and Dual Zone Data Sheet 03/Oct/2007 ...

  • Page 40

    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 ...