Pressure
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🛆 Pressure Chip
BOSCH's BME280 pressure sensor is perfect for our mini GPS tracker. Its application is very popular in embedded systems, due to its precise measurements and miniature size. The metal casing houses both a pressure sensor and a temperature sensor.
In addition, its technological and energy performances are remarkable: 2.7µA for a reading every Hz in low-power mode. It's the perfect sensor for data acquisition at low energy cost.
Last but not least, the BMP280's price/performance ratio is equally impressive. BOSCH has succeeded in making a reliable, high-quality sensor affordable.
Technological Capabilities
| Characteristic | Description |
|---|---|
Measurement Range | Pressure: From 300 to 1100 hPa Temperature: From -40°C To 85°C |
Resolution | Pressure: ~0.01hPa Temperature: ~0.01°C |
Average Power Consumption | Normal Mode : 3.4µA @ 1Hz Low Power Mode : 2.74µA @ 1Hz |
Acquisition Time | ~ 5.5ms |
I2C Speed | Jusqu'à 157Hz |
🛆 Hardware Integration
Hardware integration is straightforward. The pressure sensor only requires two decoupling capacitor of 100nF (see page 35 of the datasheet).
| Pin Number | Symbol | Description |
|---|---|---|
1 & 7 | GND | Connected to GND |
2 | CSB | Chip Select (for I2C use, connect to VDDIO) |
3 | SDI | I2C data bus (SDA) Serial Input & Output |
4 | SCK | I2C digital bus (SCL) Serial Clock Input |
5 | SDO | Serial Data Output (for I2C use, connect to GND) |
6 | VDDIO | Digital Interface Supply |
8 | VDD | Analog Supply (From 1.71V To 3.6V) |
🛆 Documentation
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