Data Sheet
Final Datasheet
BME280 Environmental sensor
Page 51
BST-BME280-DS001-10 | Revision 1.1 | May 2015 Bosch Sensortec
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Note: Specifications within this document are subject to change without notice.
9. Appendix B: Measurement time and current calculation
In this chapter, formulas are given to calculate measurement rate, filter bandwidth and current
consumption in different settings.
9.1 Measurement time
The active measurement time depends on the selected values for humidity, temperature and
pressure oversampling and can be calculated in milliseconds using the formulas below.
For example, using temperature oversampling ×1, pressure oversampling ×4 and no humidity
measurement, the measurement time is:
9.2 Measurement rate in forced mode
In forced mode, the measurement rate depends on the rate at which it is forced by the master.
The highest possible frequency in Hz can be calculated as:
If measurements are forced faster than they can be executed, the data rate saturates at the
attainable data rate. For the example above with 11.5 ms measurement time, the typically
achievable output data rate would be:
9.3 Measurement rate in normal mode
The measurement rate in normal mode depends on the measurement time and the standby
time and can be calculated in Hz using the following formula:
The accuracy of t
standby
is described in the specification parameter Δt
standby
. For the example
above with 11.5 ms measurement time, setting normal mode with a standby time of 62.5 ms
would result in a data rate of: