MLX90616 Datasheet, PDF (2/36 Pages) Melexis Microelectronic Systems – Infra Red Thermometer in TO-39 for high temperature thermometer guns

MLX90616ESF-HCA
Infra Red Thermometer in TO-39
for high temperature thermometer guns
General description (continued)
An optical filter (long-wave pass) that cuts off the visible and near infra-red radiant flux is integrated in the
package to provide ambient and sunlight immunity. The wavelength pass band of this optical filter is between
8 and 14µm.
A low noise amplifier, high resolution 17-bit ADC and powerful DSP unit in the MLX90302 enables high
accuracy and resolution of the thermometer. The calculated object and ambient temperatures are available in
RAM of MLX90302 with resolution of 0.02 ˚C. They are accessible by 2 wire serial SMBus compatible
protocol (0.02°C resolution) or via 10-bit PWM (Pulse Width Modulated) output of the device.
The MLX90616 is factory calibrated to allow operation in wide ambient temperature ranges from -40 to 85 ˚C.
As a standard, the MLX90616 is supplied with a programmed object emissivity of 1. It can be easily changed
by the customer for any other emissivity in the range 0.1…1.0 without the need for recalibration with a black
body.
The PWM can be easily customized for virtually any range desired by the customer by changing the content
of 2 EEPROM cells. This has no influence on the calibration of the device and temperature calculations in
the device. Only the PWM output is adjusted.
It is a common issue with infrared thermometer guns that they are sensitive to ambient temperature
variations. It has therefore often been required to let the thermometer stabilize for a long period (20
minutes) before achieving accurate measurements.
The MLX90616ESF-HCA incorporates a secondary thermopile sensor to sense thermal gradients in
the package and in the optical assembly. The signal of this secondary sensor is used to compensate
for the adverse effect these thermal gradients have on the measurement. In this way it is possible to
make a thermometer gun which stabilizes very quickly (seconds) and gives accurate results in
demanding environments.
3901090616
Rev 002
Page 2 of 36
Data Sheet
August 20, 2012