SGP40

Part: SGP40, Sensirion

Type: Indoor Air Quality Sensor for VOC Measurements

Key Specs:

• Power consumption: 2.6 mA at 3.3 V
• Output signal (VOC Index): 0 to 500 VOC Index points
• Output signal (SRAW): 0 to 65'535 ticks
• Measurement range (Ethanol): 0 to 1'000 ppm
• Specified range (Ethanol): 0.3 to 30 ppm
• Response time (τ63): <10 s
• Response time (τ90): <30 s
• Switch-on behavior (detecting VOC events): <60 s
• Switch-on behavior (specifications met): <1 h
• Sensitivity (SRAW, doubling VOC concentration): -870 ticks (typical)

Features:

• MOx based gas sensor
• Outstanding long-term stability and lifetime
• I²C interface with digital output signal
• Very small 6-pin DFN package
• Low power consumption
• Tape and reel packaged, reflow solderable
• CMOSens® technology
• Temperature-controlled micro hotplate
• Humidity-compensated VOC based indoor air quality signal
• Output signal processed by Sensirion's powerful VOC Algorithm
• Robustness against contaminating gases
• Low drift and device-to-device variation
• High reproducibility and reliability
• Suitability for standard SMD assembly processes

Applications:

• Indoor air quality applications
• Air purifiers
• Demand-controlled ventilation systems
• High-volume applications

Package:

• 6-pin DFN: 2.44 x 2.44 x 0.85 mm³

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

| | | Values | |----------------------------------------------|--------------|--------|-----------------------------------|------|------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | Parameter | Symbol | Min. | Typ. | Max. | Unit | Comments | | Supply voltage, hotplate supply
voltage10 | VDD,
VDDH | 1.7 | 3.3 | 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. | | Idle current | IDD | – | 34 | 105 | A | 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, I
2C | Table 2 Electrical specifications.

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.

Table 5 Absolute minimum and maximum ratings.

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.

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.