BME688

Part: BME688 — Bosch Sensortec

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

Description: The BME688 is the first gas sensor with Artificial Intelligence (AI) and integrated high-linearity and high-accuracy pressure, humidity and temperature sensors, capable of detecting VOCs, VSCs, CO, and H2 in the ppb range, housed in a 3.0 x 3.0 x 0.9 mm³ package.

Operating Conditions:

• Supply voltage: 1.71 V to 3.6 V (VDD main), 1.2 V to 3.6 V (VDDIO interface)
• Operating temperature: -40 to +85 °C
• Operating humidity: 0 to 100% r.H.
• Operating pressure: 300 to 1100 hPa

Absolute Maximum Ratings:

• Max supply voltage: 4.25 V (at any supply pin)
• Max storage temperature: +85 °C
• Max pressure: 20000 hPa

Key Specs:

• Sleep current: 0.15 μA (Typ)
• Current during humidity measurement: 340 μA (Typ, Max at 85 °C)
• Current during pressure measurement: 714 μA (Typ, Max at -40 °C)
• Current during temperature measurement: 350 μA (Typ, Max at 85 °C)
• Gas sensor supply current (heater operation): 12 mA (Typ, heater target 320 °C, constant operation, VDD ≤ 1.8 V, 25°C)
• Humidity absolute accuracy: ±3% r.H. (20-80 %r.H., 25 °C)
• Pressure absolute accuracy: ±0.6 hPa (300-1100 hPa, 0-65°C)
• Temperature absolute accuracy: ±0.5 °C (0-65 °C)
• Gas sensor H2S F1 score: 0.94

Features:

• Gas scanner function with AI for detecting VOCs, VSCs, CO, H2
• Integrated high-linearity and high-accuracy pressure, humidity, and temperature sensors
• Digital interfaces: I²C (up to 3.4 MHz) and SPI (3 and 4 wire, up to 10 MHz)
• Low power consumption modes (e.g., 0.15 μA in sleep mode)
• BME AI-Studio tool for gas scanner customization
• RoHS compliant, halogen-free, MSL1

Applications:

• Indoor air quality measurement
• Bad breath or spoiled food detection
• Detection of unusual gases and smells (e.g., leakage)
• Diaper state detection
• Early detection of odors & bad smells
• Handsets, wearables, smart home devices, room climate sensors, home appliances, gaming, connected devices, sensor networks

Package:

• 3.0 mm x 3.0 mm x 0.93 mm metal lid LGA

• 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

The absolute maximum ratings are determined over the complete temperature range using corner lots. The values are provided in Table 11.

Table 11: Absolute maximum ratings

• 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

Picture 16: Package dimensions for top, bottom and side view