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PDF SI7022-A20 Data sheet ( Hoja de datos )
| Número de pieza | SI7022-A20 | |
| Descripción | HUMIDITY/TEMPERATURE SENSOR | |
| Fabricantes | Silicon Laboratories | |
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Si7022-A20
H U M I D I T Y/ TE M P E R A T U R E S E N S O R W I T H P W M O U T P U T
Features
Precision Relative Humidity Sensor Factory-calibrated
± 4% RH (max), 0–80% RH
PWM Output
High Accuracy Temperature Sensor 3x3 mm DFN Package
±0.4 °C (max), –10 to 85 °C
Excellent long term stability
0 to 100% RH operating range
Optional factory-installed cover
–40 to +125 °C operating range
Low-profile
Wide operating voltage
Protection during reflow
(1.9 to 3.6 V)
Excludes liquids and particulates
Low Power Consumption
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 Si7022 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 a PWM output. The PWM
output may be filtered to produce an analog voltage output. 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 Si7022 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 Si7022 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 18.
Pin Assignments
Top View
Patent Protected. Patents pending
Rev. 1.1 6/15
Copyright © 2015 by Silicon Laboratories
Si7022-A20
1 page  
Table 3. PWM Interface Specifications
1.9 VDD 3.6 V; TA = –40 to +125 °C unless otherwise noted.
Parameter
Symbol
Test Condition
PWM Frequency
PWM Duty Cycle
SELECT Setup Time
FPWM
DCPWM
tSS
tH / tPWM
From SELECT transition to
PWM valid
Min
1.00
0
—
Si7022-A20
Typ Max Unit
1.22 1.40 kHz
— 100 %
500 — ms
Figure 1. PWM Interface Timing Diagram
Rev. 1.1
5
5 Page 
4. Functional Description
Si7022-A20
Figure 5. Si7022 Block Diagram
The Si7022 is a digital relative humidity and temperature sensor that integrates temperature and humidity sensor
elements, an analog-to-digital converter, signal processing, calibration, polynomial non-linearity correction, and a
PWM output all in a single chip. The Si7022 is individually factory-calibrated for both temperature and humidity,
with the calibration data stored in on-chip, non-volatile memory. This ensures that the sensor is fully
interchangeable, with no recalibration or changes to software required. Patented use of industry-standard CMOS
and low-K dielectrics as a sensor enables the Si7022 to achieve excellent long term stability and immunity to
contaminants with low drift and hysteresis. The Si7022 offers a low-power, high-accuracy, calibrated and stable
solution ideal for a wide range of temperature, humidity, and dew-point applications including medical and
instrumentation, high-reliability automotive and industrial systems, and cost-sensitive consumer electronics.
While the Si7022 is largely a conventional mixed-signal CMOS integrated circuit, relative humidity sensors in
general and those based on capacitive sensing using polymeric dielectrics have unique application and use
requirements that are not common to conventional (non-sensor) ICs. Chief among those are:
The need to protect the sensor during board assembly, i.e., solder reflow, and the need to subsequently
rehydrate the sensor.
The need to protect the senor from damage or contamination during the product life-cycle.
The impact of prolonged exposure to extremes of temperature and/or humidity and their potential effect on
sensor accuracy.
The effects of humidity sensor “memory”.
Each of these items is discussed in more detail in the following sections.
Rev. 1.1
11
11 Page | ||
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| PDF Descargar | [ Datasheet SI7022-A20.PDF ] | |
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