Simpler and greener relative humidity measurements 2014

Posted by Mohammad Ajmal on 10:56 PM
Simpler and greener relative humidity measurements

Silicon Labs has today announced its second-generation relative humidity and temperature sensing solution, the Si701x/2x sensors. The new sensors simplify RH sensing designs while providing industry-leading power efficiency and ease of use. Target applications include accurate RH sensing for home automation, HVAC, refrigeration, healthcare, remote monitoring, automotive and industrial equipment.
The Si701x/2x family can be used in conjunction with Silicon Labs’ broad portfolio of energy-friendly microcontrollers and wireless ICs to enable best-in-class solutions for measuring, controlling and reporting environmental conditions for a wide range of connected devices linked to the Internet of Things.
Mark Thompson, vice president and general manager of Silicon Labs’ Access, Power and Sensor products, comments: “The new Si701x/2x family represents the state of the art in RH sensing, offering an unmatched combination of ultra-low power, ease of use, small size, precision, reliability and compatibility with standard manufacturing flows. As the only single-chip RH/temperature sensing solutions offered by a broad-based semiconductor supplier, the Si701x/2x sensors can be combined with Silicon Labs’ energy-friendly MCUs, ZigBee and sub-GHz wireless ICs, and other sensor products to address wireless sensing applications for the Internet of Things.”
Combining a standard CMOS mixed-signal IC with a proven technique of measuring humidity using a polymer dielectric film, the Si701x/2x devices provide a superior alternative to legacy RH sensing approaches, which use discrete resistive or capacitive RH sensing elements along with analog circuits for temperature compensation and signal conditioning. Often necessitating a bigger bill of materials and PCB area, these discrete solutions typically have a high risk of contamination and low reliability. Incompatible with surface-mount technology, RH/temperature calibration must be performed during PCB assembly. Attempting to solve these challenges, RH sensor module suppliers have resulted in a higher system cost without improving reliability or risk of contamination.
Contrasting the complex discrete approaches, the monolithic Si701x/2x ICs provide the highest ease of use and reduced manufacturing cost and complexity. Fully calibrated and SMT compatible, the Si701x/2x family achieves highest long-term reliability (thanks to the integrated CMOS design) and also requires negligible BOM cost. Protection against contamination is offered by an optional filter cover, in addition to the factory-installed cover (a Teflon membrane sealed at the top of the IC). This factory-installed cover protects the sensor throughout the device’s entire lifetime, shielding the sensing element from dust, dirt and cleaning agents during operation.
Featuring the lowest power consumption in the integrated RH/temperature sensor market, the Si701x/2x sensors have a 3.3 V power supply voltage and 8-bit resolution, while consuming only 1.9 µW average on-chip power when taking one sample per second. Up to six times lower power than competing RH sensors, this energy efficiency makes the sensors ideally suited for power-sensitive applications and helps extend battery life.
Providing best-in-industry RH sensing precision, the Si701x/2x family is ideal for a majority of RH and temperature sensing applications that have stringent accuracy requirements. Operating over a temperature range from -10°C to +85°C, superior long-term RH accuracy is ensure with the lowest long-term RH drift at <0 .25="" 0="" 80="" a="" accuracy="" also="" and="" from="" humidity="" maintain="" maximum="" of="" operating="" over="" p="" per="" range.="" range="" rh="" sensors="" temperature="" the="" to="" wide="" year.="">


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