MLX90616 Datasheet, PDF (19/36 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
First data is available 0.25 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. Details on embedded filtering are available in application note “Understanding MLX90616 on-chip
digital signal filters”, available from www.melexis.com
SCL line is kept low in order to reduce current leakage through the pin (artificial Zener diode is connected to
that pin).
8.4.8 MLX90616 SMBus specific remarks
Continuous SMBus readings can introduce an error. As the SCL line inside TO39 package is passing
relatively close to the sensor input and error signal is induced to the sensor output. The manifestation of the
problem is wrong temperature readings. This is especially valid for narrow FOV devices. Possible solution is
to keep SDA and SCL line quiet for period longer than refresh rate and settling time defined by internal
settings of MLX90616 prior to reading the temperature or switch to PWM signal and completely disconnect
from SDA and SCL line.
3901090616
Rev 002
Page 19 of 36
Data Sheet
August 20, 2012