Digital Pressure Sensor
[0006]

BMB085 Digital Pressure Sensor

The BMP085 is the fully pin- and function compatible successor of the SMD500, a new generation of high precision digital pressure sensors for consumer applications. The universal C-code SMD500/BMP085 (“BMP085_SMD500_API”) is fully upward compatible to SMD500 and recognizes automatically the device ID.

The ultra-low power, low voltage electronics of the BMP085 is optimized for use in mobile phones, PDAs, GPS navigation devices and outdoor equipment. With a low altitude noise of merely 0.25m at fast conversion time, the BMP085 offers superior performance.

The I2C interface allows for easy system integration with a microcontroller. The BMP085 is based on piezo-resistive technology for EMC robustness, high accuracy and linearity as well as long term stability.

Key features

Pressure range: 300 ... 1100hPa (+9000m ... -500m above sea level)
Supply voltage: 1.8 ... 3.6V (VDDA) and 1.62V ... 3.6V (VDDD)
Low power: 5?A at 1 sample / sec. in standard mode
Low noise: 0.06hPa (0.5m) in ultra low power mode
0.03hPa (0.25m) ultra high resolution mode
< 0.1m possible with software averaging algorithm

- Temperature measurement included
- I2C interface
- Fully calibrated

New features

Smaller package height 1.2mm
Faster conversion time (standard mode each) 7.5ms (max.)
Faster I2C data transfer max. 3.4MHz max.
Extended min. supply voltage min. 1.8V min.
Lower stand-by current (typ.) 0.1?A
External clock not necessary

Typical applications

• Enhancement of GPS navigation (dead-reckoning, slope detection, etc.)
• In- and out-door navigation
• Leisure and sports
• Weather forecast
• Vertical velocity indication (rise/sink speed)