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LPS22HB
Application note
ST LPS22HB Application Note
Digital pressure sensors hardware guidelines for system integration
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1 System Integration
Figure 1: Pressure Sensor System Integration
2 Mechanical Design Rules
Sensor Placement
Exposition to the Environment
Heat Propagation
Figure 2: Pressure Sensor Integration and Embodiment Reference
Figure 3: Pressure Sensor Integration and Embodiment with Vent Channel
Figure 4: Heating Isolation Implemented for Protecting the Sensor
Figure 5: Top View of the Sensor Housing: on the Left a Correct Design with the Heat Isolation, on the Right
Figure 6: Sensor with a Correct Sensor Placement on the PCB to Get the Appropriate Isolation from Heat Sources
Figure 7: Sensor with a Bad Wiring on the PCB
Figure 8: Sensor Wiring with Wrong Placement on the PCB
Mechanical Stress
Figure 9: Bad Configuration for Mechanical Stress (A)
Figure 10: Bad Configuration for Mechanical Stress (B)
Figure 11: Good Configuration for Avoiding Mechanical Stress and Reducing the Dead Volume (A)
Sensor Embodiment and Housing
Figure 12: Good Configuration for Avoiding Mechanical Stress and Reducing the Dead Volume (B)
Figure 13: Example of Good Sensor Embodiment and Housing
Figure 14: Example of Good Sensor Embodiment and Housing with Airflow Channel
Sensor Protection
Figure 15: Example of a Bad Sensor Embodiment and Housing
3 Reference Design: Integration and Housing on a Personal Device
Figure 16: Integration of the Digital Pressure Sensor Device in a Sensor Chamber with Two Vent Apertures
Figure 17: Device Integration Reference in a Portable Device
4 Use Case and Configuration Example for the LPS22HB
Main Device Settings
Table 1: ODR Configuration
Table 2: FIFO Mode Selection
5 Use Case and Configuration Example for the LPS25HB
Main Device Settings
Table 3: ODR Configuration
Table 4: Temperature Resolution Configuration
Table 5: FIFO Coefficient Filter
Figure 18: FIFO Moving Average Filter Scheme
Table 6: FIFO MEAN MODE Configurations for Different Application Scenarios
6 Revision History
Table 7: Document Revision History
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Use Case and Configuration Example for the Lps22Hb
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AN4672
Application note
LPS22HB/LPS25HB digital pressure sensors:
hardware guidelines for system integration
Introduction
The purpose of this application note is to introduce guidelines for the hardware integration of
STMicroelectronics's LPS22HB and LPS25HB pressure sensors in the final customer's application.
August 2016
DocID027655 Rev 3
1/24
www.st.com
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Lps25hb
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