Combined humidity and pressure sensor - BME280


Product Specification

General Description：

    The BME280 is a humidity sensor especially developed for mobile applications and wearables where size and low power consumption are key design parameters. The unit combines high linearity and high accuracy sensors and is perfectly feasible for low current consumption, long-term stability and high EMC robustness. The humidity sensor offers an extremely fast response time and therefore supports performance requirements for emerging applications such as context awareness, and high accuracy over a wide temperature range.

 

Key features：


• Package
                              2.5 mm x 2.5 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
                    V_DD main supply voltage range: 1.71 V to 3.6 V

                                               V_DDID  interface voltage range: 1.2 V to 3.6 V


• Current consumption
          1.8 μA @ 1 Hz humidity and temperature

                                               2.8 μA @ 1 Hz pressure and temperature

                                               3.6 μA @ 1 Hz humidity，pressure and temperature

                                               0.1 μA in sleep mode

• Operating range
                 -40...+85℃，0...100 % rel. humidity, 300...1100 hPa

• Humidity sensor and pressure sensor can be independently enabled/ disabled

• Register and performance compatible to Bosch Sensortec BMP280 digital pressure sensor

• RoHS compliant, halogen-free, MSL1


 

Key parameters for humidity sensor：


• Response time (t63%)
                     1s


• Accuracy tolerance                         ±3 % relative humidity

• Hysteresis
                                       ±1% relative humidity


 

Key parameters for pressure sensor：


• RMS Noise
                                           0.2 Pa, equiv.to 1.7cm


• Offset temperature coefficient
            ±1.5 Pa/K,equiv.to±12.6cm at1℃ temperature change


Typical application：

• Context awareness,e.g.skin detection, room change detection

• Fitness monitoring / well-being


    -Warning regarding dryness or high temperatures

    -Measurement of volume and air flow

• Home automation control


    -control heating, venting, air conditioning (HVAC)

• Internet of things


• GPS enhancement(e.g. time-to-first-fix improvement, dead reckoning, slope detection)

• Indoor navigation (change of floor detection, elevator detection)

• Outdoor navigation, leisure and sports applications

• Weather forecast

• Vertical velocity indication (rise/sink speed)

 

Target devices：

• Handsets such as mobile phones, tablet PCs, GPS devices

• Navigation systems

• Gaming, e.g flying toys

• Camera (DSC, video)

• Home weather stations

• Flying toys

• Watches

Technical data：

Parameter	Technical data
Operation range	Pressure: 300...1100 hPa Temperature: -40…85℃
Supply voltage VDDIO Supply voltage VDD	1.2 ... 3.6 V 1.71 ... 3.6 V
Interface	I2C and SPI
Average current consumption (typ.) (1Hz data refresh rate)	1.8 μA @ 1 Hz (H, T) 2.8 μA @ 1 Hz (P, T) 3.6 μA @ 1 Hz (H, P, T) T = temperature
Average current consumption in sleep mode	0.1 μA
Humidity sensor Response time (τ63%) Accuracy tolerance Hysteresis	1 s ±3% relative humidity ≤2% relative humidity
Pressure sensor RMS Noise Sensitivity Error   Temperature coefficient offset	0.2Pa (equiv. to 1.7cm) ±0.25% (equiv. to 1m at 400m height change)   ±1.5Pa/K (equiv. to ±12.6cm at 1℃ temperature change)
RoHS compliant, halogen-free, MSL1
Package dimensions	8-Pin LGA with metal 2.5 x 2.5 x 0.93 mm3