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BMP280 Datasheet(PDF) 20 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) 20 Page - Bosch Sensortec GmbH

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BMP280 Digital Pressure Sensor
Page 20
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.
Sensortec, for readout and compensation. For details on memory map and interfaces, please
consult chapters 3.12 and 5 respectively.
The timing for data readout in forced mode should be done so that the maximum measurement
times (see chapter 3.8.1) are respected. In normal mode, readout can be done at a speed similar
to the expected data output rate (see chapter 3.8.2). After the values of ‘ut’ and ‘up’ have been
read, the actual pressure and temperature need to be calculated using the compensation
parameters stored in the device. The procedure is elaborated in chapter 3.11.
3.10 Data register shadowing
In normal mode, measurement timing is not necessarily synchronized to readout. This means that
new measurement results may become available while the user is reading the results from the
previous measurement. In this case, shadowing is performed in order to guarantee data
consistency. Shadowing will only work if all data registers are read in a single burst read.
Therefore, the user must use burst reads if he does not synchronize data readout with the
measurement cycle. Using several independent read commands may result in inconsistent data.
If a new measurement is finished and the data registers are still being read, the new measurement
results are transferred into shadow data registers. The content of shadow registers is transferred
into data registers as soon as the user ends the burst read, even if not all data registers were
read. Reading across several data registers can therefore only be guaranteed to be consistent
within one measurement cycle if a single burst read command is used. The end of the burst read
is marked by the rising edge of CSB pin in SPI case or by the recognition of a stop condition in
I2C case. After the end of the burst read, all user data registers are updated at once.
3.11 Output compensation
The BMP280 output consists of the ADC output values. However, each sensing element behaves
differently, and actual pressure and temperature must be calculated using a set of calibration
parameters. The recommended calculation in chapter 3.11.3 uses fixed point arithmetic. In high-
level languages like Matlab™ or LabVIEW™, fixed-point code may not be well supported. In this
case the floating-point code in appendix 8.1 can be used as an alternative. For 8-bit micro
controllers, the variable size may be limited. In this case a simplified 32 bit integer code with
reduced accuracy is given in appendix 8.2.
3.11.1 Computational requirements
The table below shows the number of clock cycles needed for compensation calculations on a 32
bit Cortex-M3 micro controller with GCC optimization level –O2. This controller does not contain
a floating point unit, so all floating-point calculations are emulated. Floating point is only
recommended for PC applications where an FPU is present.
Table 16: Computational requirements for compensation formulas

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