BME688

Part: Bosch Sensortec BME688

Type: Digital low power gas, pressure, temperature & humidity sensor with AI

Key Specs:

• Package dimensions: 3.0 mm x 3.0 mm x 0.93 mm
• VDD main supply voltage range: 1.71 V to 3.6 V
• VDDIO interface voltage range: 1.2 V to 3.6 V
• Current consumption (1 Hz humidity and temperature): 2.1 μA
• Current consumption (1 Hz pressure and temperature): 3.1 μA
• Current consumption (1 Hz humidity, pressure and temperature): 3.7 μA
• Current consumption (ULP mode for p/h/T & air quality): 90 μA
• Current consumption (LP mode for p/h/T & air quality): 0.9 mA
• Current consumption (standard gas scan mode): 3.9 mA
• Current consumption (customized operation modes for p/h/T/gas): 0.09‒12 mA
• Current consumption (sleep mode): 0.15 μA
• Operating temperature range: -40‒+85 °C
• Operating humidity range: 0‒100% r.H.
• Operating pressure range: 300‒1100 hPa
• Gas sensor F1 score for H2S scanning: 0.94
• Gas sensor standard scan speed: 10.8 s / scan
• Gas sensor electric charge for standard scan: 0.18 mAh
• Humidity sensor response time (0-63%): ~8 s
• Humidity sensor accuracy tolerance: ±3% r.H.
• Humidity sensor hysteresis: ±1.5% r.H.
• Pressure sensor RMS Noise: 0.12 Pa
• Pressure sensor offset temperature coefficient: ±1.3 Pa/K
• Temperature sensor absolute accuracy (0 - 65°C): ±0.5 °C

Features:

• First gas sensor with Artificial Intelligence (AI)
• Integrated high-linearity and high-accuracy pressure, humidity and temperature sensors
• Robust yet compact package
• Developed for mobile & connected applications where size and low power consumption are critical
• Gas sensor detects Volatile Organic Compounds (VOCs), volatile sulfur compounds (VSCs) and other gases (carbon monoxide, hydrogen) in ppb range
• Gas scanner function
• Detects VSCs as indicator for bacteria growth
• Gas scanner can be customized (sensitivity, selectivity, data rate, power consumption)
• BME AI-Studio tool enables training of gas scanner for specific applications
• Digital interface I²C (up to 3.4 MHz)
• Digital interface SPI (3 and 4 wire, up to 10 MHz)
• RoHS compliant, halogen-free, MSL1

Applications:

• Indoor air quality measurement
• Bad breath or spoiled food detection based on volatile sulfur compounds
• Detection of unusual gases and smells (e.g., leakage)
• Diaper state detection
• Early detection of odors & bad smells
• Handsets (mobile phones, tablet PCs, GPS devices)
• Wearables (smart watches, connected sensors)
• Mobile / care devices (toothbrushes, breath checkers)
• Smart home devices (smart speakers, connected sensors, lamps)
• Room climate sensors
• Home appliances
• Gaming (flying toys)
• Connected devices (asset tracking, surveillance)
• Sensor networks / sensor nodes

Package:

• Metal lid LGA: 3.0 mm x 3.0 mm x 0.93 mm

• Package 3.0 mm x 3.0 mm x 0.93 mm metal lid LGA Digital interface I²C (up to 3.4 MHz) and SPI (3 and 4 wire, up to 10 MHz) Supply voltage VDD main supply voltage range: 1.71 V to 3.6 V VDDIO interface voltage range: 1.2 V to 3.6 V 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 0.09‒12 mA for p/h/T/gas in customized operation modes 0.15 μA in sleep mode Operating range -40‒+85 °C, 0‒100% r.H., 300‒1100 hPa

• The product is RoHS compliant, halogen-free, MSL1

• Indoor air quality measurement
• Bad breath or spoiled food detection based on the measurement of volatile sulfur compounds, which are an indicator of bacteria growth
• Detection of unusual gases and smells, which might indicate for instance a leakage
• Diaper state detection, e.g. for baby care
• Early detection of odors & bad smells

Target Devices

• Handsets such as mobile phones, tablet PCs, GPS devices
• Wearables e.g. smart watches or connected sensors
• Mobile / care devices like toothbrushes or breath checkers
• Smart home devices, e.g. smart speakers, connected sensors or lamps
• Room climate sensors
• Home appliances
• Gaming, e.g. flying toys
• Connected devices, for instance for asset tracking or surveillance
• Sensor networks / sensor nodes

Videos, further documents & software is available online:

• BME688:https://www.bosch-sensortec.com/products/environmental-sensors/gas-sensors/bme688/
• Software:https://www.bosch-sensortec.com/software-tools/software/bme688-software/

Key features

• Package 3.0 mm x 3.0 mm x 0.93 mm metal lid LGA Digital interface I²C (up to 3.4 MHz) and SPI (3 and 4 wire, up to 10 MHz) Supply voltage VDD main supply voltage range: 1.71 V to 3.6 V VDDIO interface voltage range: 1.2 V to 3.6 V 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 0.09‒12 mA for p/h/T/gas in customized operation modes 0.15 μA in sleep mode Operating range -40‒+85 °C, 0‒100% r.H., 300‒1100 hPa

• The product is RoHS compliant, halogen-free, MSL1

Key parameters for gas sensor

• F1 score for H2S scanning 0.94
• Standard scan speed 10.8 s / scan
• Electric charge for standard scan 0.18 mAh (5 scans ~ 1 min)
• Power consumption < 0.1 mA in ultra-low power mode
• Output data processing Major direct outputs: Index for Air Quality (IAQ), bVOC- & CO2-equivalents (ppm), Gas scan result (%) & Intensity level (all listed in Table 20: BSEC outputs)

Key parameters for humidity sensor

Response time (0-63%) ~8 s Accuracy tolerance ±3% r.H. Hysteresis ±1.5% r.H.

Key parameters for pressure sensor

RMS Noise 0.12 Pa, equiv. to 1.7 cm Offset temperature coefficient ±1.3 Pa/K, equiv. to ±10.9 cm at 1 °C temperature change

Key parameters for temperature sensor

Absolute accuracy ±0.5 °C (0 - 65°C)

4. Software 30

5. Global memory map and register description 32

• 5.2 Memory map
• 5.3 Register description
• 5.3.1 General control registers
• 5.3.2 Sensor identification registers
• 5.3.3 Temperature, pressure and relative humidity control registers
• 5.3.4 Gas control registers
• 5.3.5 Data registers
• 5.3.6 Status registers

6. Digital interfaces 45

• 6.2 PC Interface
• 6.2.1 PC write
• 6.2.2 PC read
• 6.3 SPI interface
• 6.3.1 SPI write
• 6.3.2 SPI read
• 6.4 Interface parameter specification
• 6.4.1 General interface parameters
• 6.4.2 PC timings
• 6.4.3 SPI timings