SGP40-D-R4

Datasheet SGP40 Indoor Air Quality Sensor for VOC Measurements       MOx based gas sensor for indoor air quality applications Outstanding long-term stability and lifetime I2C interface with digital output signal Very small 6-pin DFN package: 2.44 x 2.44 x 0.85 mm3 Low power consumption: 2.6 mA at 3.3 V Tape and reel packaged, reflow solderable Product Summary The SGP40 is a digital gas sensor designed for easy integration into air purifiers or demand-controlled ventilation systems. Sensirion’s CMOSens® technology offers a complete, easy-to-use sensor system on a single chip featuring a digital I2C interface and a temperaturecontrolled micro hotplate, providing a humiditycompensated VOC based indoor air quality signal. The output signal can be directly processed by Sensirion’s powerful Gas Index Algorithm to translate the raw signal into a VOC Index as a robust measure for indoor air quality. The Gas Index Algorithm automatically adapts to the environment the sensor is exposed to. Both sensing element and Gas Index Algorithm feature an unmatched robustness against contaminating gases present in real-world applications enabling a unique long-term stability as well as low drift and device-to-device variation. The very small 2.44 x 2.44 x 0.85 mm3 DFN package enables applications in limited spaces. Sensirion’s state-of-the-art production process guarantees high reproducibility and reliability. Tape and reel packaging together with suitability for standard SMD assembly processes make the SGP40 predestined for high-volume applications. Figure 1 Functional block diagram of the SGP40. www.sensirion.com version 1.2 – February 2022 1/20 Table of Contents 1 Sensor Performance................................................................................................................................................................3 2 Specifications ..........................................................................................................................................................................5 2.1 Electrical Specifications .....................................................................................................................................................5 2.2 Timing Specifications .........................................................................................................................................................5 2.3 Recommended Operating and Storage Conditions ...........................................................................................................5 2.4 Absolute Minimum and Maximum Ratings .........................................................................................................................6 2.5 Hardware Interface Specifications .....................................................................................................................................7 2.6 Environmental Stability ......................................................................................................................................................8 2.7 Material Contents ...............................................................................................................................................................8 3 Sensor Output Signal Description .........................................................................................................................................9 3.1 Raw Signal Measurement ..................................................................................................................................................9 3.2 VOC Index Measurement ..................................................................................................................................................9 3.3 Built-in Self-Test...............................................................................................................................................................10 3.4 Reading out The Sensor Serial Number ..........................................................................................................................10 3.5 Sensor Start-up Behavior .................................................................................................................................................10 4 Digital Interface Description .................................................................................................................................................11 4.1 General Considerations ...................................................................................................................................................11 4.2 I2C Address ......................................................................................................................................................................11 4.3 I2C Voltage Levels............................................................................................................................................................11 4.4 I2C Protocol Speed...........................................................................................................................................................11 4.5 I2C Sequences .................................................................................................................................................................11 4.6 Checksum Calculation .....................................................................................................................................................12 4.7 I2C Commands .................................................................................................................................................................12 5 Mechanical Specifications ....................................................................................................................................................15 5.1 Traceability.......................................................................................................................................................................15 5.2 Package Outline...............................................................................................................................................................15 5.3 Land Pattern ....................................................................................................................................................................16 5.4 Soldering Instructions ......................................................................................................................................................16 6 Ordering Information .............................................................................................................................................................17 6.1 Packaging Information .....................................................................................................................................................17 www.sensirion.com version 1.2 – February 2022 2/20 1 Sensor Performance Table 1 lists specifications characterizing the gas sensing performance. The SGP40 chip provides a digital raw signal (SRAW_VOC) which is sensitive to most VOC gases typically present in indoor environments and which is proportional to the logarithm of the resistance of the sensing material. This signal is intended for further processing by Sensirion’s robust Gas Index Algorithm, which is available on GitHub (see SGP40 product page on Sensirion’s webpage), to provide a VOC bases output signal that can be directly used for indoor air quality applications. For the specifications given below, ethanol in clean air has been used as proxy gas for typical indoor air events. Parameter Output signals2 Measurement range Specified range Device-to-device variation Repeatability Values1 Comments Min. VOC Index, processed value from SRAW_VOC 1 SRAW_VOC, digital raw value 0 Ethanol in clean air 0 Ethanol in clear air 0.3 4 VOC Index – Typ. – – – –