Gas Sensor BME688
The BME688 is the first gas sensor with Artificial Intelligence (AI) and integrated high-linearity and high-accuracy pressure, humidity and temperature sensors. The gas sensor can detect Volatile Organic Compounds (VOCs) and other gases such as carbon monoxide and hydrogen in the part per billion (ppb) range. Additionally to all functions of the BME680, the BME688 comes with
- Specific detection of VSCs
- Application-specific gas scanner
- BME AI-Studio
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Technical data
Package dimensions
8-Pin LGA with metal
3.0 x 3.0 x 0.93 mm³
3.0 x 3.0 x 0.93 mm³
Operation range (full accuracy)
Pressure: 300...1100 hPa
Humidity 0…100%
Temperature: -40…85°C
Humidity 0…100%
Temperature: -40…85°C
Supply voltage VDDIO
Supply voltage VDD
Supply voltage VDD
1.2 ... 3.6 V
1.71 ... 3.6 V
1.71 ... 3.6 V
Interface
I²C and SPI
Average current consumption
2.1 µA at 1 Hz humidity and temperature
3.1 µA at 1 Hz pressure and temperature
3.7 µA at 1 Hz humidity, pressure and temperature
90 µA at ULP mode for p/h/T & air quality
0.9 mA at LP mode for p/h/T & air quality
3.9 mA in standard gas scan mode
(gas scan mode & scan rate can be optimized on applications with BME AI studio)
3.1 µA at 1 Hz pressure and temperature
3.7 µA at 1 Hz humidity, pressure and temperature
90 µA at ULP mode for p/h/T & air quality
0.9 mA at LP mode for p/h/T & air quality
3.9 mA in standard gas scan mode
(gas scan mode & scan rate can be optimized on applications with BME AI studio)
Gas sensor
F1 score for H₂S scanning
Standard scan speed
Electric charge for standard scan
Response time (τ 33-63%)
Sensor-to-sensor deviation
Power consumption
Output data processing
F1 score for H₂S scanning
Standard scan speed
Electric charge for standard scan
Response time (τ 33-63%)
Sensor-to-sensor deviation
Power consumption
Output data processing
0.94
10.8 s / scan
0.18 mAh (5 scans ~ 1 min)
< 1 s (for new sensors)
+/- 15% +/- 15
< 0.1 mA in ultra-low power mode
Major direct outputs: Index for Air Quality (IAQ), bVOC-& CO₂-equivalents (ppm), Gas scan result (%) & many more (all listed in datasheet in Table 20: BSEC outputs)
10.8 s / scan
0.18 mAh (5 scans ~ 1 min)
< 1 s (for new sensors)
+/- 15% +/- 15
< 0.1 mA in ultra-low power mode
Major direct outputs: Index for Air Quality (IAQ), bVOC-& CO₂-equivalents (ppm), Gas scan result (%) & many more (all listed in datasheet in Table 20: BSEC outputs)
Humidity sensor
Response time (τ0-63%)
Accuracy tolerance
Hysteresis
Response time (τ0-63%)
Accuracy tolerance
Hysteresis
8 s
± 3 % relative humidity
≤ 1.5 % relative humidity
± 3 % relative humidity
≤ 1.5 % relative humidity
Pressure sensor
RMS Noise
Sensitivity Error
Temperature coefficient offset
RMS Noise
Sensitivity Error
Temperature coefficient offset
0.12 Pa (equiv. to 1.7 cm)
± 0.25 % (equiv. to 1 m at 400 m height change)
±1.3 Pa/K (equiv. to ±10.9 cm at 1°C temperature change)
± 0.25 % (equiv. to 1 m at 400 m height change)
±1.3 Pa/K (equiv. to ±10.9 cm at 1°C temperature change)
