SENSIRION SFA30 Application Note

Description of the SFA30 I
Application Note for the SFA30 Formaldehyde Sensor Module
This application note describes the protocol to operate the SFA30 formaldehyde sensor module via the provided
I C interface.
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Content
1 Introduction
2 Description of the SFA30 I
3 Application Circuit
4 Important Notices
Headquarters and Subsidiaries
1 Introduction
This application note describes the protocol to operate the SFA30 formaldehyde sensor module via the provided I
interface. Please refer to the sensor module datasheet for electrical specifications and further details.
IMPORTANT NOTE: The I
parameters are subject to change without notice. The I
General considerations for using the I
IC-protocol to connect two chips on a PCB. When the sensor is connected to the main PCB via a cable, particular
attention must be paid to electromagnetic interference and crosstalk. Use as short as possible (< 10 cm) and/or well
shielded connection cables. We recommend using the UART interface instead, whenever possible: it is more robust
against electromagnetic interference, especially with long connection cables.
This document describes the command set for the sensor's I
protocol itself and its detailed implementation, please consult the document "NXP I2C-bus specification and user
manual" (http://www.nxp.com/documents/user_manual/UM10204.pdf).
The physical interface consists of two bus lines, a data line (SDA) and a clock line (SCL) which need to be connected
via pull-up resistors to the bus voltage of the system.
Important: For selecting the I
when the sensor is powered-up.
www.sensirion.com / D1
C Interface
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C Interface
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C interface is preliminary and should be used for R&D purposes only. Commands and
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C interface: Remember that the I
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C interface, the interface select pin (SEL, pin 5) must be connected to GND before or
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V0.4 – January 2021 – preliminary and subject to change without notice
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C interface has only been subject to limited testing.
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C (IIC) protocol was originally designed as Inter-
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C interface. For detailed information about the I
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C
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C
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