Compact Si7005 Sensor IC Reduces System Cost and Complexity in Applications That Monitor and Control Humidity and Temperature
Traditional approaches to RH sensing use discrete resistive and capacitive sensors, hybrids and multi-chip modules (MCMs). These legacy approaches suffer from high bill of materials (BOM) cost and component count, large footprints, manufacturing challenges and the need for labor-intensive customer calibration. In contrast, the single-chip Si7005 humidity sensor is smaller, more reliable, and much easier to design in and use than traditional discrete/module solutions.
The Si7005 humidity sensor is a "plug-and-play," factory-calibrated RH and temperature sensing solution. The device's digital output and factory calibration frees the developer from having to calibrate the sensor and also makes Si7005 sensors completely interchangeable. No software/firmware update or recalibration effort is required to change from one sensing unit to another. The customer spends no time or labor on the manufacturing line adjusting each unit, which eases production, rework and field servicing. The Si7005 sensor's compact QFN package supports tape-and-reel packaging, automated pick-and-place PCB manufacturing and conventional soldering processes, further helping OEMs reduce manufacturing costs.
The Si7005 sensor uses state-of-the-art sensing technologies to enable precise monolithic humidity and temperature sensing. Temperature is sensed by a precision bandgap referenced circuit on the die. Humidity is sensed by measuring the capacitance change of an industry-standard low-k dielectric layer applied to the surface of the die. Both temperature and humidity are precisely measured in very close proximity on the same monolithic device, providing exceptional measurement accuracy. The Si7005 device is also the lowest power RH sensor of its kind, consuming only 2 µA on average at one measurement per minute, which makes it ideal for battery-powered applications.
The entire BOM for the Si7005 RH sensor solution is just two bypass capacitors versus the dozens of components often required to implement the same functionality with a discrete solution. The Si7005 device integrates sensing elements, an analog-to-digital converter (ADC), signal processing, non-volatile memory for calibration data and an I2C interface in a monolithic CMOS IC. This high level of single-chip integration makes the sensor rugged and reliable, reduces cost and development time, and simplifies board design.
"The Si7005 humidity sensor offers an unmatched combination of
ease-of-use, reliability, small size, low power and compatibility with
standard manufacturing flows," said
The Si7005 humidity sensor is the newest member of Silicon Labs' growing portfolio of sensor products, which includes capacitive touch sensors, proximity and ambient light sensors, MCU-based temperature sensors, isolated ac current sensors and high-side dc current sensors.
Pricing and Availability
Volume production quantities of Silicon Labs' Si7005 humidity and
temperature sensor are available now in a 4 mm x 4 mm QFN package.
Product pricing for the Si7005 sensor in 10,000-unit quantities begins
The Si7005USB-DONGLE USB-based evaluation board, priced at
For additional Si7005 sensor product information, samples and development tools, please visit www.silabs.com/humidity-sensor.
This press release may contain forward-looking statements based on
Silicon Laboratories' current expectations. These forward-looking
statements involve risks and uncertainties. A number of important
factors could cause actual results to differ materially from those in
the forward-looking statements. For a discussion of factors that could
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