Data Sheet

Final Datasheet
BME280 Environmental sensor
Page 16
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.
samples generated, which means that the data output rate must be known to calculate the
actual response time. For register configuration, please refer to Table 28. A sample response
time calculation is shown in chapter 9.4.
Table 6: filter settings
Filter coefficient
Samples to reach ≥75 %
of step response
Filter off
1
2
2
4
5
8
11
16
22
In order to find a suitable setting for filter, please consult chapter 3.5.
When writing to the register filter, the filter is reset. The next ADC values will the pass through
the filter unchanged and become the initial memory values for the filter. If temperature or
pressure measurements are skipped, the corresponding filter memory will be kept unchanged
even though the output registers are set to 0x80000. When the previously skipped
measurement is re-enabled, the output will be filtered using the filter memory from the last time
when the measurement was not skipped. If this is not desired, please write to the filter register
in order to re-initialize the filter.
The step response (e.g. response to in sudden change in height) of the different filter settings is
displayed in Figure 7.
Figure 7: Step response at different IIR filter settings
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32
0
10
20
30
40
50
60
70
80
90
100
Number of samples
Response to step [%]
Step response at different IIR filter settings
filter off
2
4
8
16