SGP41-D-R4

Datasheet SGP41 Air Quality Sensor for VOC and NOx Measurements       MOx based gas sensor for air quality applications Outstanding long-term stability and lifetime I2C interface with digital output signals Very small 6-pin DFN package: 2.44 x 2.44 x 0.85 mm3 Low power consumption: 3.0 mA at 3.3 V Tape and reel packaged, reflow solderable Product Summary The SGP41 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 temperaturecontrolled micro hotplates, providing one VOC and one NOx based indoor air quality signal. 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. 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 SGP41 predestined for high-volume applications. Figure 1 Functional block diagram of the SGP41. www.sensirion.com version 1.0 – December 2021 1/22 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 ...........................................................................................................6 2.4 Absolute Minimum and Maximum Ratings .........................................................................................................................7 2.5 Interface Specifications ......................................................................................................................................................7 2.6 Environmental Stability ......................................................................................................................................................8 2.7 Material Contents ...............................................................................................................................................................8 3 Sensor Output Signal Description .........................................................................................................................................9 3.1 Conditioning .......................................................................................................................................................................9 3.2 Raw Signal Measurement ..................................................................................................................................................9 3.3 VOC and NOx Index Measurement ..................................................................................................................................10 3.4 Built-in Self-Test...............................................................................................................................................................11 3.5 Reading out The Sensor Serial Number ..........................................................................................................................11 3.6 Sensor Start-up Behavior .................................................................................................................................................11 4 Digital Interface Description .................................................................................................................................................12 4.1 General Considerations ...................................................................................................................................................12 4.2 I2C Address ......................................................................................................................................................................12 4.3 I2C Voltage Levels............................................................................................................................................................12 4.4 I2C Protocol Speed...........................................................................................................................................................12 4.5 I2C Sequences .................................................................................................................................................................12 4.6 Checksum Calculation .....................................................................................................................................................13 4.7 I2C Commands .................................................................................................................................................................13 5 Mechanical Specifications ....................................................................................................................................................18 5.1 Traceability.......................................................................................................................................................................18 5.2 Package Outline...............................................................................................................................................................18 5.3 Land Pattern ....................................................................................................................................................................19 5.4 Soldering Instructions ......................................................................................................................................................19 6 Ordering Information .............................................................................................................................................................20 6.1 Packaging Information .....................................................................................................................................................20 www.sensirion.com version 1.0 – December 2021 2/22 1 Sensor Performance Table 1 lists specifications characterizing the gas sensing performance. The SGP41 chip provides two digital raw signals which are sensitive to most VOCs typically present in indoor environments and oxidizing gases such as NOx or O3, respectively. The raw signals are proportional to the logarithm of the resistance of the sensing material. For the specifications given below, ethanol in clean air has been used as proxy gas for typical VOC based indoor air events and NO2 in clean air has been used as proxy gas for typical oxidizing gas based indoor air events. Parameter Conditions Output signal range2 VOC Index, processed value from SRAW_VOC NOx Index, processed value from SRAW_NOX SRAW_VOC, digital raw value from VOC pixel SRAW_NOX, digital raw value from NOx pixel Ethanol in clean air NO2 in clean air Ethanol in clean air NO2 in clean air VOC Index Measurement range Specified range Device-to-device variation4 Values1 Min. 1 1 0 0 0 0 500 50 – Typ. – – – – – – – –