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Description: The BMP180 is a high-precision, ultra-low power digital barometer. It offers a measuring range of 300 to 1100 hPa with an absolute accuracy of down to 0.02 hPa. The BMP185 is based on piezo-resistive technology for EMC robustness, high accuracy and linearity as well as long term stability. What makes this sensor great is that it is nearly identical to its former rev, the BMP085!

This sensor supports a voltage supply between 1.8 and 3.6VDC. It is designed to be connected directly to a micro-controller via the I²C bus

The BMP180 comes in an ultra-thin, 8-pin ceramic lead-less chip carrier (LCC) package.

Features:

  • Wide barometric pressure range
  • Digital two wire (I2C) interface
  • Flexible supply voltage range
  • Ultra-low power consumption
  • Low noise measurement
  • Fully calibrated
  • Temperature measurement included
  • Ultra-flat, small footprint

Documents:

Comments 3 comments

  • The BMP180 can trade off power and response time for accuracy via its different modes essentially by oversampling. And as @BradLevy said, accuracy is not the same as resolution. But for many applications you would be more interested in resolution and relative accuracy (ie, after self-calibration) than absolute accuracy. Altitude hold on a multicopter is one example.

    You can get close to 0.25m relative accuracy (noise) for altitude hold and low altitude altimeter applications with this device, though if you’re trying to use it as a barometer for absolute pressure its at least an order of magnitude less accurate.

    Also: you can’t use this for high altitude rocketry or near space balloon applications as it is only specified to 9000m ASL.

  • More from the data sheet:

    The accuracy is -2/+0 hPa typical, -6/+4.5 hPa over -20C .. +65C temperature range.

    The resolution is gets down to 0.02 hPa. But resolution is not the same as accuracy.

  • ok, some numbers from the datasheet - resolution: 0.06hPa (0.5m) in ultra low power mode 0.02hPa (0.17m) advanced resolution mode range: +9000m … - 500m relating to sea level


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