MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 Features and Benefits Applications Examples 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.
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.
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 3 Table of Contents 1 Functional diagram......................................................................................................................................................................................1 2 General Description ....................................................................................................................................................................................
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 4 Glossary of Terms PTAT Proportional To Absolute Temperature sensor (package temperature) PTC Positive Temperature Coefficient 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.
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 6 Pin definitions and descriptions 2 - PWM/ SDA 1 - SCL/ Vz 3 - VDD 4 - VSS Top view Figure 2: Pin description Pin Name VSS SCL / Vz PWM / SDA VDD Function Ground. The metal can is also connected to this pin. Serial clock input for 2 wire communications protocol. 5.7V zener is available at this pin for connection of external bipolar transistor to MLX90614A to supply the device from external 8 -16V source. Digital input / output.
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 7 Electrical Specifications 7.1 MLX90614Axx All parameters are preliminary for TA = 25 ˚C, VDD =5V (unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Units 4.5 5 5.5 V Supplies External supply VDD Supply current IDD No load 1 2 mA Supply current (programming) IDDpr No load, erase/write EEPROM operations 1.5 2.5 mA Zener voltage Vz Iz = 75…400 uA 5.6 5.75 5.
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 Parameter Symbol Test Conditions Min Typ 1.8 2 Max Units SMBus compatible 2-wire interface2 Input high voltage VIH Input high voltage VIH(Ta,V) Over temperature and supply Input low voltage VIL Input low voltage VIL(Ta,V) Over temperature and supply VOL SCL leakage SDA leakage 1.6 1.0 V V 1.3 V 1.5 V SDA pin in open drain mode, over temperature and supply, Isink = 2mA 0.
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 7.2 MLX90614Bxx , MLX90614Dxx All parameters are preliminary for TA = 25 ˚C, VDD =3V (unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Units 2.4 3 3.6 V Supplies External supply VDD Supply current IDD No load 1 2 mA Supply current (programming) IDDpr No load, erase/write EEPROM operations 1.5 2.5 mA Power-down supply current Isleep no load 1 2.
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 Parameter Symbol Test Conditions Min Typ Max Units SMBus compatible 2-wire interface2 Input high voltage VIH Input high voltage VIH(Ta,V) Over temperature and supply Input low voltage VIL Input low voltage VIL(Ta,V) Over temperature and supply VOL SCL leakage SDA leakage Output low voltage 1.6 2 2.4 V 1.2 2 2.8 V 0.7 1.0 1.3 V 0.5 1.0 1.
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 8 Detailed description 8.1 Block diagram 81101 OPA ADC DSP PWM t° STATE MACHINE Voltage Regulator 90302 Figure 3: block diagram 8.
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 8.3 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 achieved. 8.3.2 Supply regulator and POR The module can operate from 2 different supplies: VDD= 5V => MLX90614Axx VDD=3.
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 The address PWMCTRL consists of control bits for configuring the PWM/SDA pin: Bit 0 Select the type of 1 - Single PWM, factory default for 0 – Extended PWM, factory default PWM mode: MLX90614xAx for MLX90614xBx Bit 1 Enable/disable the 1 - Enable PWM, disable SMBus 0 - Disable PWM (Enable SMBus), PWM: Factory default Bit 2 Configuration of the 1 - Push-Pull, 0 – Open Drain NMOS, factory pin PWM: default Bit 3 Mode selection 1 - Thermo Relay
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 On-chip filtering and settling time: The MLX90614 features configurable on-chip digital filters. They allow customization for speed or noise. Factory default configurations and the typical settling time and noise for the MLX90614 family are given below. Device MLX90614 AAA, BAA, DAA MLX90614 ABA, BBA MLX90614 ACC, BCC MLX90614 ACF, BCF Settling time, sec Typical noise, °C rms Spike limit 0.10 0.14 0.14 1.33 0.05 0.07 0.18 0.
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 8.3.4 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. Name RAM (32x17) Address Melexis reserved … Melexis reserved Raw data IR channel 1 Raw data IR channel 2 TA 000h … 003h 004h 005h 006h TOBJ1 TOBJ2 007h 008h Melexis reserved … Melexis reserved 009h … 01Fh Read access Yes … Yes Yes Yes Yes Yes … Yes 8.
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 8.4.2 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, Write Byte and Read Byte • Process Call • Block commands – Block Write and Write-Block Read Process Call Supported commands are: • Read Word • Write Word 8.4.
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 START, REPEATED START, STOP, ACK, and NACK bits. The PEC is a CRC-8 with polynomial X8+X2+X1+1. The Most Significant Bit of every byte is transferred first. 8.4.3.1.1 Read Word (depending on the command – RAM or EEPROM) 1 S 7 1 Slave Address ……….. 1 8 Wr A 1 1 Command A Sr 7 1 Slave Address 1 Rd A 8 1 8 1 8 1 1 Data Byte Low A Data Byte High A PEC A P ……….. Figure 5: SMBus read word format 8.4.3.1.
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 Thdac(MD) is the time after the ninth falling edge of SCL that MLX90614 will take control of the PWM/SDA (so it can continue with the next byte to transmit). 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]. Timeout,L Tsuac Timeout,H Thdac SCL PWM/SDA Figure 7: SMBus timing 8.4.
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 8.4.6 Commands RAM and EEPROM can be read both with 32x16 sizes. If the RAM is read, the data are divided by two, due to a sign bit in RAM (for example, TOBJ1 - RAM address 0x07h will sweep between 0x27ADh to 0x7FFF as the object temperature rises from -70.01°C to +382.19°C). The MSB read from RAM is an error flag (active high) for the linearized temperatures (TOBJ1, TOBJ2 and Ta). The MSB for the raw data (e.g.
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 8.4.7.2 Exit from Sleep Mode Sleep Awake Normal SCL PWM/SDA tDDq Figure 10: Exit Sleep Mode First data is available 0.2 seconds (typ) after exit from Sleep is done. On-chip IIR filter is skipped for the very first measurement. All measurements afterwards pass the embedded digital filtering as configured in EEPROM.
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 8.5 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 reading of two temperatures (dual zone object or object and ambient). The PWM period is derived from the on-chip oscillator and is programmable.
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 The different time intervals t1-t3 have the following functions: t1: Start buffer. During this time the signal is always high. t1 = 0.125*T (T is the PWM period, refer to fig. 11). t2: Valid Data Output Band, 0 to 1/2T. PWM output data resolution is 10 bit. t3: Error band – information for fatal error in EEPROM (double error detected, not correctable). t3 = 0.25 * T. Therefore a PWM pulse train with a duty cycle of 0.
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 8.5.3 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 order to fit in the desired range.
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 8.6 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 needs to be kept high in order to use PWM. tREQ SCL PWM/SDA Start PWM SMBus Stop Figure 13: Switching from PWM mode to SMBus 8.6.
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 8.7 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) it. The thermopile output signal is: Vir (Ta, To ) = A.
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 Gain measurement with fixed length FIR filter Offset compensation Additional gain filtering with fixed length IIR, storing the result into RAM as IRG. Gain compensation calculation, the result is stored into RAM as KG Object temperature: IR1 sensor: IR sensor measurement with programmable length FIR filter *. Offset compensation Gain compensation Filtering with programmable length IIR filter**, storing the result into RAM as IR1D.
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 8.8 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 output of the MLX90614 is NOT a relay driver but a logical output which should be connected to a relay driver if necessary.
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 9 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 of temperatures, power supplies and refresh rates. The user can program the internal object emissivity correction for objects with a low emissivity.
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 10 Performance Graphs 10.1 Temperature accuracy of the MLX90614 All accuracy specifications apply under settled isothermal conditions only. Furthermore, the accuracy is only valid if the object fills the FOV of the sensor completely. 380 To,oC ± 4 oC 300 240 ± 4 oC ± 3 oC 180 ± 4 oC ± 3 oC ± 2 oC ± 2 oC ± 2 oC ± 3 oC ± 2 oC ± 1 oC ± 1 oC ± 2 oC ± 2 oC ± 1 oC ± 0.
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 All accuracy specifications apply under settled isothermal conditions only. 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 ranges is the same as in previous diagram. Medical accuracy specification is only available for the MLX90614DAA version. To,oC 45 42 ± 0.
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 10.2 Field Of View (FOV) Field of view is determined at 50% thermopile signal and with respect to the sensor main axis. Parameter MLX90614xAA MLX90614xBA MLX90614xCC MLX90614xCF Peak zone 1 ±0° -25° ±0° ±0° Width zone 1 90° 70° 35° 10 Not applicable Not applicable Peak zone 2 -25° Not applicable Width zone 2 70° 1.00 0.75 0.50 0.25 Angle, Deg 0.
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 1.00 0.75 0.50 0.25 Angle, Deg 0.00 -80° -60° -40° -20° 0° 20° 40° 60° 80° Figure 21: FOV of MLX90614xCC 1.00 0.75 0.50 0.25 Angle, Deg 0.
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 11 Applications Information 11.1 Use of the MLX90614 thermometer in SMBus configuration +3.3V R1 R2 2 PWM SDA Vdd C1 U2 MCU SDA SMBus SCL 1 Vz 3 U1 Vdd Vss 4 SCL GND MLX90614Bxx 0.1uF Figure 23: MLX90614 SMBus connection Connection of the MLX90614 to SMBus with 3.3V power supply. The MLX90614 has diode clamps SDA/SCL to Vdd so it is necessary to provide MLX90614 with power in order not to load the SMBus lines. 11.
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 11.3 PWM output operation Using the PWM output mode of the MLX90614 is very simple, as shown on Figure 25. J1 1 SCL Vz Vdd PWM 2 SDA PWM GND U1 MLX90614 Vdd 3 C1 CON1 Vss 0.1uF Figure 25: Connection of MLX90614 for PWM output mode The PWM mode is free-running after POR when configured in EEPROM. The SCL pin must be forced high (can be shorted to Vdd pin) for PWM mode operation.
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 capacitor. 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 very simple thermostats to be built without the need of any MCU and zero design overhead required for firmware development.
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 12 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.
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 power dissipation. 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 power supply, bypassing the capacitor and therefore causing EMC, noise, level degradation and power dissipation problems.
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 13 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 and EN60749-15 Resistance to soldering temperature for through-hole mounted devices Iron Soldering THD’s (Throu
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 15 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 0.84…0.95 are typical. IR thermometers use the radiation flux between the sensitive element in the sensor and the object of interest, given by the equation ( ) ( ) q = ε 1 .α 1 . T1 .σ .
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 between the sensor package and the sensor die. 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 to appear during transient conditions.
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 16 Package Information 16.1 MLX90614XXA The MLX90614 is packaged in an industry standard TO – 39 can. Figure 29: MLX90614XXA package Note: All dimensions are in mm 16.
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 16.3 MLX90614XCF Figure 31: MLX90614XCF package 16.4 Part marking The MLX90614 is laser marked with 10 symbols. First 3 letters define device version (AAA, BCC, etc), and the last 7 are the lot number. Example: “ACC9307308” – MLX90614ACC from lot 9307308.
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 17 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 Semiconductor Company, PowerSmart, Inc., Toshiba Battery Co. Ltd., Unitrode Corporation, USAR Systems, Inc.
MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 Revisions Table Version Changes Remark 001 002 003 004 Preliminary Release Date Not on docserver - ordering info (p.1): maximum ratings, accuracy section - added PWM connection, Application section - remade single zone FOV - added PWM details, p. 31 - remove text "filter outside option" -wake-up time (page 17) increased from 13 to 80 ms 27-Feb-2007 Added 35 deg.
