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IR thermometer eases remote temperature monitoring

Posted: 26 Sep 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Melexis? MLX90614? infrared thermometer? remote monitoring? IR thermometer?

Melexis' MLX90614 infrared thermometer

Melexis' MLX90614 infrared thermometer, which integrates a custom signal conditioning block, offers a cost-effective remote monitoring solution for automobile air conditioning, room heaters, home appliances, handhelds and medical equipment.

The sensing element in the MLX90614 is an automotive-grade silicon chip having a thin, micro-machined membrane. Its output is measured by the chip's thermocouple. The device's signal-conditioning block, containing a low-noise amplifier, 17bit ADC and DSP, amplifies and digitizes the output of the thermocouple and calculates the object temperature using factory set calibration parameters stored in the EEPROM memory of the chip. The SMBus-compatible digital output is fully linearized and compensated for ambient temperature. Temperature resolution is 0.01C. The standard MLX90614 has an absolute accuracy of 0.5C over 0 to 50C and 1C outside that range.

The MLX90614 is available in 3V and 5V versions. The 3V model, with less then 1mA current draw, is targeted at handheld, battery operated devices. This sensor has a "sleep" mode; current draw is as low as 2?A. The 5V model can operate from a 12V car battery with the addition of a few external components. The MLX90614 is qualified in accordance to AECQ100 and is ROHS compatible. It meets JEDEC 020C specs for high-temperature soldering (i.e., up to 260C).

The MLX90614, rated for operation over -40C to 125C (extended range of -70C to 380C is available), is priced at $5.75 each in 1,000 pieces.

- Vince Biancomano

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