SI7021-A20 Datasheet, PDF (1/36 Pages) Silicon Laboratories – IC HUMIDITY AND TEMPERATURE SENSOR

Si7021-A20
I²C HUMIDITY AND TEMPERATURE SENSOR
Features
 Precision Relative Humidity Sensor  Factory-calibrated
 ± 3% RH (max), 0–80% RH
 I²C Interface
 High Accuracy Temperature Sensor _{ Integrated on-chip heater}
±0.4 °C (max), –10 to 85 °C
 3x3 mm DFN Package
 0 to 100% RH operating range
 Excellent long term stability
 Up to –40 to +125 °C operating
 Optional factory-installed cover
range
Low-profile
 Wide operating voltage
(1.9 to 3.6 V)
 Low Power Consumption
Protection during reflow
Excludes liquids and particulates
150 μA active current
60 nA standby current
Applications
 HVAC/R
 Thermostats/humidistats
 Respiratory therapy
 White goods
 Indoor weather stations
 Micro-environments/data centers
 Automotive climate control and
defogging
 Asset and goods tracking
 Mobile phones and tablets
Description
The Si7021 I²C Humidity and Temperature Sensor is a monolithic CMOS IC
integrating humidity and temperature sensor elements, an analog-to-digital
converter, signal processing, calibration data, and an I²C Interface. The patented
use of industry-standard, low-K polymeric dielectrics for sensing humidity enables
the construction of low-power, monolithic CMOS Sensor ICs with low drift and
hysteresis, and excellent long term stability.
The humidity and temperature sensors are factory-calibrated and the calibration
data is stored in the on-chip non-volatile memory. This ensures that the sensors
are fully interchangeable, with no recalibration or software changes required.
The Si7021 is available in a 3x3 mm DFN package and is reflow solderable. It can
be used as a hardware- and software-compatible drop-in upgrade for existing RH/
temperature sensors in 3x3 mm DFN-6 packages, featuring precision sensing
over a wider range and lower power consumption. The optional factory-installed
cover offers a low profile, convenient means of protecting the sensor during
assembly (e.g., reflow soldering) and throughout the life of the product, excluding
liquids (hydrophobic/oleophobic) and particulates.
The Si7021 offers an accurate, low-power, factory-calibrated digital solution ideal
for measuring humidity, dew-point, and temperature, in applications ranging from
HVAC/R and asset tracking to industrial and consumer platforms.
Ordering Information:
See page 29.
Pin Assignments
Top View
Patent Protected. Patents pending
Rev. 1.1 6/15
Copyright © 2015 by Silicon Laboratories
Si7021-A20