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Si7021-A20

SiLSi7021-A20

Silicon Labs
Digital humidity and temperature sensor commonly used in low-cost environmental sensing applications.
2,500 in stock
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Overview

The Si7021-A20 is a monolithic CMOS IC integrating humidity and temperature sensor elements, an analog-to-digital converter, signal processing, and an I2C interface. It features a factory-calibrated low-drift polymer dielectric sensor that provides high accuracy and long-term stability in a compact 3x3mm DFN package.

Why Choose This Part

This sensor offers excellent energy efficiency with a standby current of only 0.62uA and low active currents of 150uA for RH and 90uA for temperature conversions. Its integrated on-chip heater allows for the removal of condensation and facilitates self-testing in high-humidity environments.

Applications

HVAC Monitoring
Precise climate control and humidity sensing for smart thermostats and environmental building automation.
Industrial Cold Chain
Tracking temperature and moisture levels for perishable goods in storage and transit to ensure product integrity.
Consumer Electronics
Integration into portable weather stations, humidifiers, and handheld environmental monitors where low power is critical.

Getting Started

Engineers can evaluate the sensor using the Si7021-EVB evaluation kit or via various I2C-enabled microcontroller platforms like the Silicon Labs EFM32 family. Implementation involves standard I2C communication at 1.9V to 3.6V, utilizing the factory calibration data stored in the on-chip non-volatile memory for plug-and-play accuracy.

Also Consider

SHT31-DIS-B SENSensirion AG - Offers a higher standard humidity accuracy of +/- 2 percent RH but typically consumes more power during active measurement cycles.
BME280 Bosch Sensortec - A combined sensor solution that adds barometric pressure sensing to humidity and temperature in a single package.

Categories

Sensors > Humidity Sensors