Hardware Overview
Key Technical Specifications
- Operating Voltage: 1.71V to 3.6V
- Supply Current: 0.9 µA (sleep), 2.1 µA (ULP), ~920 µA (gas scan)
- Operating Temperature: -40°C to +85°C
- Relative Humidity Range: 0% to 100% RH
- Pressure Range: 300 hPa to 1100 hPa
- Gas Sensing: VOCs, IAQ index via integrated gas sensor
- Interfaces: I²C and SPI (up to 3.4 MHz)
- Package Size: 3.0 × 3.0 × 0.93 mm³
⚙️ Technical Specifications
| Parameter | Technical Data |
|---|---|
| Package dimensions | 8-Pin LGA with metal 3.0 x 3.0 x 0.93 mm³ |
| Operation range (full accuracy) | Pressure: 300...1100 hPa Humidity: 0…100% Temperature: -40…85°C |
| Supply voltage VDDIO | 1.2 - 3.6 V |
| Supply voltage VDD | 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) |
| 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 (5 scans ~ 1 min) |
| Gas sensor - Response time (τ 33-63%) | < 1 s (for new sensors) |
| Gas sensor - Sensor-to-sensor deviation | +/- 15% |
| Gas sensor - Power consumption | < 0.1 mA in ultra-low power mode |
| Gas sensor - Output data processing | 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%) | 8 s |
| Humidity sensor - Accuracy tolerance | ± 3 % relative humidity |
| Humidity sensor - Hysteresis | ≤ 1.5 % relative humidity |
| Pressure sensor - RMS Noise | 0.12 Pa (equiv. to 1.7 cm) |
| Pressure sensor - Sensitivity Error | ± 0.25 % (equiv. to 1 m at 400 m height change) |
| Pressure sensor - Temperature coefficient offset | ±1.3 Pa/K (equiv. to ±10.9 cm at 1°C temperature change) |
🔌 Pinout
Pinout Diagram
Pinout Details
| Pin Label | Description |
|---|---|
| VCC | Power supply (3.3V or 5V) |
| GND | Ground |
| SDA/SDI | I²C data / SPI data in |
| SCL/SCK | I²C clock / SPI clock |
| CSB | Chip select (SPI, active low) |
| SDO | SPI data out |
📏 Dimensions
📃 Topology
| Ref. | Description |
|---|---|
| IC1 | BME688 Environmental Sensor |
| L1 | Power On LED |
| U1 | AP2112K 3V3 Regulator |
| JP1 | 2.54 mm Castellated Holes |
| J1 | QWIIC Connector (JST 1 mm pitch) for I2C |