SGP40数据手册(Sensirion_Gas-Sensors_SGP40

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Preliminary 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 VOC 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 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. spaces. in limited 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 temperature- controlled micro hotplate, providing a humidity- compensated VOC based indoor air quality signal. The output signal can be directly processed by Sensirion’s powerful VOC Algorithm to translate the raw signal into a VOC Index as a robust measure for indoor air quality. The VOC Algorithm automatically adapts to the environment the sensor is exposed to. Both sensing element and Figure 1 Functional block diagram of the SGP40. www.sensirion.com Version 1.0 – July 2020 – D1 1/19

Table of Contents 1 Sensor Performance .................................................................................................................................................................. 3 2 Specifications............................................................................................................................................................................. 5 3 Sensor Output Signal Description .............................................................................................................................................. 9 4 Digital Interface Description ..................................................................................................................................................... 11 5 Mechanical Specifications ....................................................................................................................................................... 15 6 Ordering Information ................................................................................................................................................................ 17 www.sensirion.com Version 1.0 – July 2020 – D1 2/19

1 Sensor Performance Table 1 lists specifications characterizing the gas sensing performance. The SGP40 chip provides a digital raw signal (SRAW) which is sensitive to all VOC gases typically present in indoor environments and which is proportional to the logarithm of the resistance of the MOx material. This signal is intended for further processing by an algorithm providing quantitative information about the VOC based indoor air quality. For this purpose, Sensirion offers its robust VOC Algorithm, which is included in the VOC Index driver package available on Sensirion’s webpage.1 The algorithm maps all VOC and fresh air events to a VOC Index scale (see application note SGP40 – VOC Index for Experts for more details). For the specifications given below, ethanol in clean air has been used as proxy gas for typical indoor air events. Parameter Comments Output signals3 Digital processed value (VOC Index) Digital raw value (SRAW) Measurement range Ethanol in clean air Specified range Ethanol in clear air Device-to-device variation VOC Index5 Repeatability VOC Index5 Limit of detection6,7 Ethanol in specified range Response time Changing concentration from 5 to 10 ppm of ethanol, at sampling interval of 1 s 63 90 Switch-on behavior Time until reliably detecting VOC events8 Sensitivity7 Time until specifications in this table are met SRAW, doubling VOC concentration Ethanol in specified range 5 to 10 ppm of ethanol Recommended sampling interval VOC Index SRAW Values2 Min. Typ. 0 0 0 0.3 – – – – – – – – – – – – <±15 <±15 <±5 <±5 – <10 <30 <60 <1 −870 Max. 500 65’535 1’000 30 – – <50 <10 – – – – – Units VOC Index points ticks4 ppm ppm VOC Index points or % VOC Index m.v. (the larger) VOC Index points or % VOC Index m.v. (the larger) ppb or % of concentration setpoint (the larger) s s s h ticks −710 −870 −1’030 ticks – 10 1 1 – 0.5 s s Table 1 Gas sensing specifications at 25 °C and 50 % RH in zero air (considered as clean air for indoor air quality applications) and a power supply of VDD of 3.3 V. All concentrations refer to ethanol as test gas. 1 Download the VOC Index Driver Package SGP40 on https://www.sensirion.com/en/download-center/gas-sensors/multi-pixel-gas-sensors/. 2 99.99 % of the sensors will be within the minimum–maximum tolerance corresponding to 4σ assuming a normal distribution. Typical tolerance refers to the mean of the distribution for ≥100 sensors. 3 Humidity compensated when actual humidity value is provided as input to the sensor (see section 3.1 Raw Signal Measurement). 4 Signal in ticks is proportional to the logarithm of the resistance of the sensing layer. 5 Evaluated using the calibration and test sequence according to the application note SGP40 – Testing Guide. 6 Limit of detection is defined as the minimum change of concentration required to obtain a raw signal change 3 times higher than the noise at the given concentration setpoint. 7 Parameter tested over simulated lifetime of 10 years in an indoor environment. Test conditions: continuous operation in 250 ppm of Decamethylcyclopentasiloxane (D5). 8 Signal increase during 60-s event of 5 to 10 ppm of ethanol is three times larger than signal drift without this event during the same duration. www.sensirion.com Version 1.0 – July 2020 – D1 3/19

Figure 2 displays the typical response of the raw signal of SGP40 to various VOCs as a function of their concentrations in otherwise clean air. Figure 2 Typical sensor response to various VOCs normalized to 500 ppb of ethanol. Data were recorded at 25 °C and 50 % RH and a power supply of VDD of 3.3 V. www.sensirion.com Version 1.0 – July 2020 – D1 4/19

2 Specifications 2.1 Electrical Specifications Table 2 lists electrical specifications of the SGP40. Default conditions of 25 °C and 3.3 V supply voltage apply to values in the table below, unless otherwise stated. The SGP40 supports both I2C “standard-mode” and “fast-mode”.9 Parameter Supply voltage, hotplate supply voltage10 Values Symbol Min. VDD, VDDH 1.7 Typ. 3.3 Idle current IDD – 34 105 A Max. Unit Comments 3.6 V Minimal voltage must be guaranteed also for the maximum supply current specified in this table. VDD and VDDH must be connected to the same power supply, see Figure 5. The idle mode is activated after power-up, after calling the sgp40_heater_off command, or after a soft reset. Supply current under operation11 – – 3.5 4.0 mA Average current consumption while the sensor is continuously operated at VDD, VDDH = 1.8 V. 2.6 3.0 mA Average current consumption while the sensor is continuously operated at VDD, VDDH = 3.3 V. Communication – Digital 2-wire interface, I2C Table 2 Electrical specifications. 2.2 Timing Specifications Timings in Table 3 refer to the power up and reset of the ASIC part and do not reflect the usefulness of the readings. Parameter Symbol Condition Min. Typ. Max. Unit Power-up time Soft reset time tPU tSR After hard reset, VDD ≥ VPOR After soft reset SCL clock frequency fSCL – Table 3 System timing specifications. – – – 0.4 0.4 – 0.6 0.6 400 ms ms kHz 2.3 Recommended Operating and Storage Conditions Gas Sensing Specifications as detailed in Table 1 are guaranteed only when the sensor is stored and operated under the recommended conditions as specified in Table 4 and displayed in Figure 3 and Figure 4. Prolonged exposure to conditions outside these conditions may reduce sensor performance. The sensor must not be exposed towards condensing conditions (i.e., >90 % relative humidity) at any time. 9 http://www.nxp.com/documents/user_manual/UM10204.pdf 10 Any supply voltage as defined by the min./max. range may be used for continuous operation of the sensor. The typical value specifies the supply voltage at which outgoing quality control is performed. 11 Sending the sgp40_measure_raw command enables continuous operation of the sensor. A 20 % higher current is drawn during 5 ms on VDDH after entering the measurement mode. www.sensirion.com Version 1.0 – July 2020 – D1 5/19

Condition Parameter Operating conditions Relative humidity Operating conditions of humidity compensation Temperature Humidity Temperature Storage conditions Relative humidity Temperature Min. 0 −10 1.5 (−13) – −10 0 5 Max. 90 50 30 (+31) 90 (the smaller) 50 80 30 Unit % RH °C g m−3 (°C dew point) or % RH °C % RH °C Table 4 Recommended humidity and temperature conditions for storing and operating the SGP40. Dew point refers to maximum humidity allowed at minimum and maximum temperature, respectively. Figure 3 Recommended relative humidity and temperature for operating the SGP40. Green area marks conditions for which humidity compensation has been optimized. Additionally, gray areas mark operating conditions without using the humidity compensation feature. Figure 4 Recommended relative humidity and temperature for storing the SGP40. To ensure an optimal performance of the SGP40, Handling and Assembly Instructions for SGPxx Gas Sensors as well as the Design-in Guide for Integrating SGP4x Gas Sensors need to be followed. 2.4 Absolute Minimum and Maximum Ratings Stress levels beyond those listed in Table 5 may cause permanent damage to the device. Exposure to minimum/maximum rating conditions for extended periods may affect sensor performance and reliability of the device. www.sensirion.com Version 1.0 – July 2020 – D1 6/19

Parameter Supply voltage VDD Supply voltage VDDH Short-term storage temperature range12 Operating temperature range Rating −0.3 to +3.6 V −0.3 to +3.6 V −40 to +70 °C −20 to +55 °C Short-term storage humidity range12 0 to 80 % (non-condensing) Operating humidity range 0 to 90 % (non-condensing) ESD HBM ESD CDM Latch up, JESD78 Class II, 125 °C Table 5 Absolute minimum and maximum ratings. 2.5 Interface Specifications 2 kV 500 V 100 mA The SGP40 comes in a 6-pin DFN package, see Table 6. Figure 5 shows a typical application circuit. The VDD pin must be decoupled with an RC element. The required decoupling for VDDH depends on the power supply network connected to the sensor, a capacitor of 1 F is recommended. VDD and VDDH must be connected to one single supply VDD. The external pull-up resistors (e.g., Rp = 10 k) are required to pull the SDA and SCL signal lines high. For dimensioning resistor sizes please take bus capacity and communication frequency into account (see section 7.1 of NXPs I2C Manual for more details, see footnote 9 on page 5). It should be noted that pull-up resistors may be included in I/O circuits of microcontrollers. The die pad or center pad is electrically connected to GND. Hence, electrical considerations do not impose constraints on the wiring of the die pad. However, for mechanical stability it is recommended to solder the die pad to the PCB. Pin Name Comments 1 2 3 4 5 6 VDD VSS SDA n/a VDDH SCL Supply voltage Ground Serial data, bidirectional Connect to ground (no electrical function) Supply voltage, hotplate Serial clock, bidirectional Table 6 Pin assignment (transparent top view). Dashed lines are only visible from the bottom. 12 Short-term storage refers to temporary conditions during, e.g., transport. www.sensirion.com Version 1.0 – July 2020 – D1 7/19

Figure 5 Typical application circuit. 2.6 Environmental Stability The SGP40 has been qualified based on the JEDEC JESD47 qualification test method. The Moisture Sensitivity Level classification of the SGP40 is MSL1, according to IPC/JEDEC J-STD-020. At the same time, it is recommended to further process the sensors within 1 year after date of delivery. The SGP40 should not be exposed to bright illumination by either sunlight or artificial light sources during operation. 2.7 Material Contents The device is fully RoHS, REACH, Halogen-free, and WEEE compliant, e.g., free of Pb, Cd, and Hg. www.sensirion.com Version 1.0 – July 2020 – D1 8/19

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