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BMP280 Datasheet(PDF) 44 Page - Bosch Sensortec GmbH

Part # BMP280
Description  Digital Pressure Sensor
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Manufacturer  BOSCH [Bosch Sensortec GmbH]
Direct Link  https://www.bosch-sensortec.com
Logo BOSCH - Bosch Sensortec GmbH

BMP280 Datasheet(HTML) 44 Page - Bosch Sensortec GmbH

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BMP280 Digital Pressure Sensor
Page 44
BST-BMP280-DS001-19 | Revision 1.19 | January 2018
Bosch Sensortec
© Bosch Sensortec GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as copying and passing on to third
parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.
Note: Specifications within this document are subject to change without notice. Not intended for publication.
7.6 Mounting and assembly recommendations
In addition to “Handling, soldering & mounting instructions BMP280”, the following
recommendations should be taken into consideration when mounting a pressure sensor on a
printed-circuit board (PCB):
 The clearance above the metal lid shall be 0.1mm at minimum.
 For the device housing appropriate venting needs to be provided in case the ambient
pressure shall be measured.
 Liquids shall not come into direct contact with the device.
 During operation the sensor chip is sensitive to light, which can influence the accuracy of
the measurement (photo-current of silicon). The position of the vent hole minimizes the
light exposure of the sensor chip. Nevertheless, BST recommends to avoid the exposure
of BMP280 to strong light sources.
 Soldering may not be done using vapor phase processes since the sensor might be
7.7 Environmental safety
7.7.1 RoHS
The BMP280 sensor meets the requirements of the EC restriction of hazardous substances
(RoHS) directive, see also:
Directive 2011/65/EU of the European Parliament and of the Council of 8 June 2011 on
the restriction of the use of certain hazardous substances in electrical and electronic
7.7.2 Halogen content
The BMP280 is halogen-free. For more details on the analysis results please contact your Bosch
Sensortec representative.
7.7.3 Internal package structure
Within the scope of Bosch Sensortec’s ambition to improve its products and secure the mass
product supply, Bosch Sensortec qualifies additional sources (e.g. 2nd source) for the LGA
package of the BMP280.
While Bosch Sensortec took care that all of the technical packages parameters are described
above are 100% identical for all sources, there can be differences in the chemical content and
the internal structural between the different package sources.
However, as secured by the extensive product qualification process of Bosch Sensortec, this has
no impact to the usage or to the quality of the BMP280 product.
8. Appendix 1: Computation formulae for 32 bit systems
8.1 Compensation formula in floating point
Please note that it is strongly advised to use the API available from Bosch Sensortec to perform
readout and compensation. If this is not wanted, the code below can be applied at the user’s risk.
Both pressure and temperature values are expected to be received in 20 bit format, positive,
stored in a 32 bit signed integer.

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