Si7020-A10
2
I C HUMIDITY AND TEMPERATURE SENSOR
Features
Precision Relative Humidity Sensor Factory-calibrated
2
4% RH (max), 080% RH
I C 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
Protection during reflow
(1.9 to 3.6 V)
Excludes liquids and particulates
Low Power Consumption
Si7020
150 A active current
60 nA standby current
Ordering Information:
See page 28.
Applications
HVAC/R Micro-environments/data centers
Pin Assignments
Thermostats/humidistats Automotive climate control and
defogging
Respiratory therapy
Asset and goods tracking
White goods
Mobile phones and tablets
Indoor weather stations
Top View
Description
SDA 1 6 SCL
2
The Si7020 I C Humidity and Temperature Sensor is a monolithic CMOS IC
integrating humidity and temperature sensor elements, an analog-to-digital
2 GND 2 5
VDD
converter, signal processing, calibration data, and an I C 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
3 4
DNC DNC
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.
Patent Protected. Patents pending
The Si7020 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 Si7020 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.
Rev. 1.1 6/15 Copyright 2015 by Silicon Laboratories Si7020-A10Si7020-A10
Functional Block Diagram
Vdd
Si7020
1.25V Calibration
Ref Memory
Humidity
Sensor
Control Logic
ADC
Temp
Sensor
SDA
2
I C Interface
SCL
GND
2 Rev. 1.1