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Design Guide for Humidity and Temperature Sensors
A comment on how to properly design-in an SHTxx or STSxx.
SHTxx are humidity and temperature sensors of highest quality with a broad range of different features. To
take full advantage of their outstanding performance, several housing and PCB design rules need to be
considered. This document aims to provide help during the design-in phase of your product and fosters a
deeper understanding of the sensor's functionality. Please note that unbeneficial housing and/or PCB designs
may cause significant temperature and humidity deviations as well as an increased response times.
Most important Design-In Recommendations
Figure 1. A small dead volume allows for rapid
adaption to changes in the environment.
Figure 3. A large opening in the housing provides
improved air exchange and thus enhanced access
to the environment.
www.sensirion.com / D1
Figure 2. Separating a sensor compartment from
the remaining housing minimizes the influence of
entrapped air on the sensor.
Figure 4. Decoupling of the sensor from heat
sources on the PCB minimizes the influence of
internal heating on the sensor.
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Version 2 – March 2024
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Table of Contents
Related Manuals for SENSIRION STS Series
Summarization of Contents
Humidity Fundamentals
Relative Humidity %RH
Explains relative humidity, its physical meaning, and impact on environments.
Dew Point and Condensation
Describes condensation and the dew point phenomenon, including examples.
Sensor Performance
Introduction to Capacitive Humidity Sensing
Overview of how capacitive humidity sensors work and their characteristics.
Identifying Measurement Needs
Guidance on assessing requirements like range, accuracy, and response time for sensor selection.
Accuracy of the Sensor vs Accuracy of the System.
Highlights how system design, not just sensor accuracy, affects overall measurement precision.
Measuring the right thing by measuring at the right place.
Emphasizes representative sampling and sensor placement for accurate environmental readings.
Response Time
Defines response time for humidity and temperature, influenced by physical equilibrium and sensor size.
Effect of Condensation
Discusses how condensed water affects Sensirion sensors, noting minimal impact within specifications.
Creep and Drift
Explains creep and drift as offset readings, detailing reversibility and factors influencing them.
Contamination of the Sensor
Describes how foreign substances affect sensor readings, causing offsets in dry and humid environments.
Thermal Considerations
Self-Heating
Addresses self-heating in electronic devices and its impact on temperature readings, with design solutions.
Effect of Temperature on the Analog Sensor
Details how component self-heating and thermal coupling affect analog sensor signals.
Thermal Design-In Conclusion:
Summarizes thermal design principles: decoupling from the device and exposure to the environment.
Electrical and Signal Considerations
Analog vs. Digital
Compares analog and digital sensor outputs and their suitability for different applications.
Electric Specifications
Points out the need to check electrical specs, power supply, and heater usage for sensors.
ESD Protection
Advises on handling precautions and design measures to protect sensors from electrostatic discharge.
I2C-Related Considerations
Covers I2C communication aspects like noise, cable length, multicomponent systems, and clock stretching.
Housing and PCB-Design Integration
Effects on Response Time
Analyzes how housing, thermal mass, and aperture size influence the sensor's response time.
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