Datasheet ZMOD4410 (Renesas) - 9

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8. Gas Sensor Module Operation Modes and Characteristics
The ZMOD architecture leverages different “Methods of Operation” which use time, temperature, and signatures from gases that enable unique signals from a highly trained machine learning system and makes use of embedded artificial intel igence (AI) technology. This section discusses the different operation modes of the ZMOD4410. At present, five operation modes are released. Family of IAQ software releases:  Operation Mode 1: IAQ 1st Generation: Continuous – Measurement of UBA levels for IAQ and eCO2  Operation Mode 2: IAQ 1st Generation: Low Power – Measurement of UBA levels for IAQ and eCO2  Operation Mode 3: IAQ 2nd Generation: Using AI for improved ppm TVOC, IAQ and eCO2 functionality (recommended for new designs)  Operation Mode 4: Odor – Control signal based on Air Quality Changes  Operation Mode 5: Sulfur-based Odor Discrimination By default, the IAQ 2nd Generation (Mode 3) operation should be used for new designs. In case of the need for a slightly faster sample rate and a larger VOC range (up to 30ppm), it is recommended to use the IAQ 1Gen algorithms. In addition, details for sensitivity, reliability, sample rates, and sensor module influences are explained in detail in the following sections. All graphs and information show the typical responses that are to be expected from the sensor module upon exposure to a variety of test conditions. Additional technical information on sensitivity, selectivity, and stability for all operation modes is available in Renesas’ ZMOD4410 Application Note – TVOC Sensing. For more information, including application notes, white papers, blog, and manuals, visit the ZMOD4410 webpage.
8.1 Operation Modes 1–3
These operation modes are used for absolute measurements of indoor air quality (IAQ) according to UBA with eCO2. Note: Modes 1, 2, and 3 use the same output signal but have differences in power consumption and sample rate. In addition, the use of the IAQ 2nd Generation algorithm with embedded AI gives better consistency and accuracy compared to traditional gas sensor module algorithms.  Operation Mode 1: IAQ 1st Generation (Continuous) provides continuous data depending on the customer application and MCU polling.  Operation Mode 2: IAQ 1st Generation (Low Power) has a fixed sampling interval of 6 seconds.  Operation Mode 3: IAQ 2nd Generation has a fixed sampling interval of 3 seconds. The fol owing sections provide information on TVOC gases, concentrations, and thresholds given by the German Federal Environmental Agency (UBA) * and the US Environmental Protection Agency (EPA). These standards provide reliable information on indoor air quality and recommendations for air improvements if necessary.
8.1.1 Air Quality – UBA Levels
The algorithm provided by Renesas for the user’s microprocessor uses the output from the ZMOD4410 to determine the relative level of TVOC gases present (see ZMOD4410 Programming Manual – Read Me; see also section 12). The algorithm features an automated baseline correction function, ensuring that the module can learn from its environment and distinguish elevated levels of TVOC under al conditions. The proprietary metal oxide (MOx) used in the sensor module allows it to respond effectively to changing TVOC levels during long-term operation. Renesas has adopted the definition of TVOCs and their impact on user health and comfort proposed by the UBA (see Table 6). The ZMOD4410 can detect the presence of elevated TVOC levels as described in the UBA study.* There are many sources of poor indoor air quality that can elevate TVOC levels in the typical home or office environments, and the types of TVOC that might be present can vary widely. Additional information on this topic is available in Renesas’ ZMOD4410 White Paper – Overview of TVOC and Indoor Air Quality. * Umweltbundesamt, Beurteilung von Innenraumluftkontaminationen mit els Referenz- und Richtwerten, (Bundesgesundheitsblatt - Gesundheitsforschung - Gesundheitsschutz, 2007). © 2020 Renesas Electronics Corporation 9 November 30, 2020 Document Outline 1. Pin Assignments 2. Pin Descriptions 3. Absolute Maximum Ratings 4. Operating Conditions 5. Electrical Characteristics 6. Block Diagram 7. Sensor Module Characteristics 7.1 Gas Sensor Module 8. Gas Sensor Module Operation Modes and Characteristics 8.1 Operation Modes 1–3 8.1.1 Air Quality – UBA Levels 8.1.2 Air Quality – Estimated Carbon Dioxide Correlation (eCO2) 8.2 Operation Mode 4: Odor 8.3 Operation Mode 5: Sulfur based Odor Discrimination 8.4 Conditioning and Stability 8.5 Environmental Temperature and Humidity 8.6 Accuracy and Consistency 9. Assembly Restrictions, Operation, Integration Notes, and Storage 10. Test and Calibration 11. I2C Interface and Data Transmission Protocol 12. Related Websites and Software 13. Glossary 14. Package Outline Drawings 15. Ordering Information 16. Revision History