Overview
The BMP280 is an absolute barometric pressure sensor designed by Bosch Sensortec, particularly suited for mobile applications. It features an extremely compact, integrated, low-power design, making it ideal for battery-powered devices such as mobile phones, GPS modules, and watches. The sensor is based on Bosch’s proven piezo-resistive pressure sensor technology, ensuring high accuracy, linearity, long-term stability, and high EMC robustness.
Key Specifications
| Parameter | Technical Data |
|---|---|
| Operation Range | Pressure: 300...1100 hPa, Temperature: -40…+85°C |
| Absolute Accuracy (950...1050 hPa, 0…+40°C) | ~ ±1 hPa |
| Relative Accuracy (700…900 hPa @ 25°C) | ± 0.12 hPa (typical), equivalent to ±1 m |
| Average Current Consumption (1 Hz data rate) | 3.4 μA @ 1 Hz, 2.74 μA (ultra-low power mode) |
| Average Current Consumption in Sleep Mode | 0.1 μA |
| Average Measurement Time | 5.5 msec (ultra-low power preset) |
| Supply Voltage VDDIO | 1.2 ... 3.6 V |
| Supply Voltage VDD | 1.71 ... 3.6 V |
| Resolution of Data | Pressure: 0.01 hPa (equivalent to < 10 cm), Temperature: 0.01°C |
| Temperature Coefficient Offset (+25°…+40°C @900hPa) | 1.5 Pa/K, equivalent to 12.6 cm/K |
| Interface | I²C and SPI (3 and 4 wire, up to 10 MHz) |
| Package Dimensions | 8-Pin LGA with metal, 2.0 x 2.5 x 0.95 mm³ |
Key Features
- High accuracy and linearity in pressure and temperature measurements.
- Low power consumption, with typical current consumption of 2.74 μA at 1 Hz in ultra-low power mode.
- Compact 8-pin LGA package with dimensions of 2.0 x 2.5 x 0.95 mm³.
- Digital interfaces including I²C (up to 3.4 MHz) and SPI (3 and 4 wire, up to 10 MHz).
- Multiple measurement modes and filter options to optimize performance for various applications.
- High EMC robustness and long-term stability.
Applications
- Enhancement of GPS navigation (e.g., time-to-first-fix improvement, dead-reckoning, slope detection).
- Indoor navigation (floor detection, elevator detection).
- Outdoor navigation, leisure, and sports applications.
- Weather forecasting.
- Vertical velocity indication (e.g., rise/sink speed).
- Healthcare applications requiring precise pressure measurements.
Q & A
- What is the operating temperature range of the BMP280?
The operating temperature range is -40°C to +85°C.
- What is the typical current consumption of the BMP280 at 1 Hz data rate?
The typical current consumption is 3.4 μA at 1 Hz, and 2.74 μA in ultra-low power mode.
- What are the digital interfaces supported by the BMP280?
The BMP280 supports I²C (up to 3.4 MHz) and SPI (3 and 4 wire, up to 10 MHz) interfaces.
- What is the package size of the BMP280?
The package dimensions are 2.0 x 2.5 x 0.95 mm³ in an 8-pin LGA package.
- What is the relative accuracy of the BMP280?
The relative accuracy is ±0.12 hPa, equivalent to ±1 m difference in altitude.
- What are some common applications of the BMP280?
Common applications include GPS navigation enhancement, indoor navigation, outdoor navigation, weather forecasting, and vertical velocity indication.
- How does the BMP280 optimize power consumption?
The BMP280 offers various measurement modes and filter options to optimize power consumption, including ultra-low power mode.
- What is the resolution of the pressure and temperature data from the BMP280?
The resolution is 0.01 hPa for pressure and 0.01°C for temperature.
- What is the temperature coefficient offset of the BMP280?
The temperature coefficient offset is 1.5 Pa/K, equivalent to 12.6 cm/K.
- How does the BMP280 handle short-term disturbances in output data?
The BMP280 is equipped with a built-in IIR filter to minimize short-term disturbances in the output data).
