MLX90614 Non-contact infrared temperature sensor IR temperature acquisition module

Model Number : MLX90614 non-contact infrared temperature sensor
Origin : Mainland China
is_customized : Yes


Product features:

The MLX90614 is a low cost, contactless thermometer from Melaycore. The output data is

linearly proportional to the object temperature, with high precision and high resolution. In the TO-

39 metal package, both the infrared induction thermopile detector chip MLX81101 (temperature

is measured by PTC or PTAT components) and the signal processing special integrated chip

MLX90302 are specially designed TO process infrared sensor output signals. Optical filters

(capable of transmitting long waves) that block visible and near-infrared radiation are integrated

into the package to provide immunity to the environment and sunlight. The filter has a

wavelength passband of 5.5 to 14m. Thanks to the integration of a low noise amplifier, a 17-bit

analog-to-digital converter and a powerful digital signal processing chip MLX90302, the

thermometer with high precision and high resolution is realized. An additional on-chip

temperature sensor measures the temperature of the chip. After measuring the output of the two

sensors, the corresponding ambient temperature and object temperature are calculated. The

calculated object temperature and ambient temperature are stored in the RAM unit of the

MLX90302 with a temperature resolution of 0.01 C and can be output via either a two-wire

SMBus (System Management Bus) compatible protocol interface (IIC compatible) (0.02 C

resolution) or a 10-bit PWM(pulse width modulation) output mode. The MLX90614 factory

temperature range is calibrated, and the temperature measured by the sensor is the average

temperature of all objects in the field of view.

The system allows up to 100 devices to be connected on two lines. Slave address stored in the

EEPROM of the device itself. The PWM pins can also be configured in thermal relay mode (the

input is the temperature of the guessed object) to construct simple and economical thermostat or

temperature (freeze/boil) alarm devices without the need for an MCU. Thresholds and hysteresis

are set via internal EEPROM. The output of the MLX90614 is not a relay driver, but a logic

output that can be connected to the relay driver if necessary. In SMBus systems this feature can be

used as a process interrupt to read the slave on the bus and determine its precise state.

Product parameters:

Size: 16.8mm(L)*11.46mm(W)*6.2mm(H), probe diameter 8.2mm

Digital interface type: IIC(slave mode) or PWM

Temperature measurement range: -70 ~ 382.2

Temperature measurement error: 0.5 (at room temperature) resolution: 0.02

Operating voltage :3.3V ~ 5V

The ambient temperature is -40 ~ 125

With M3 fixing screw hole, easy to install and fix.

Instructions for use:

After power-on and reset, the MLX90614 uses the factory default output mode SMBus, while

PWM is disabled. The SCL pin needs to be kept high to use PWM when powered on. If PWM is

enabled and you need to switch to SMBus, reconfigure the PWM/SDA pins before starting

SMBus communication. The SCL pin needs to be kept low for longer than the request time

(tREQ) >1,44ms. In this case, data on the SDA line is ignored. Once PWM is not enabled, it can

only be enabled by switching off - turning on the power or exiting sleep mode. If PWM is not

enabled via EEPROM, the PWM/SDA pins are used for SMBus communication directly after

POR. In this case, no request status needs to be sent. The way to enter SMBus mode from PWM

or thermal relay is the same

Note:

In the application design, it is necessary to note that the above accuracy can be guaranteed and

achieved when the sensor is in thermal balance and isothermal conditions. (There is no

temperature difference in the sensor package) The temperature difference inside the package will

affect the accuracy of the thermometer measurement, caused by the hot electrons on the back of

the sensor, the heater/cooler on the back of the sensor or next to it, or when a hot/cold object is

near the sensor, it will not only heat the sensing element, but also heat the thermometer package.

Operations that create thermal gradients or isolate the sensor from the environment need to be

avoided whenever possible.

Attention:

Infrared temperature measurement is affected by many factors, including the reflection spectrum

of the measured object, the effect of air refraction, low accuracy, large error, generally used in the

field with strong electromagnetic interference, contact thermometer can not work occasions. The

infrared thermometers on the market are mature commercial products, with internal ambient

temperature compensation and linear calibration algorithms, and the accuracy of this ordinary

module is not comparable. Mainly for electronic enthusiasts to study, for commercial use, without

any guarantee.