bmp280 datasheet

Bosch
Sensortec | BMP280 Data sheet
16 |
48
Modifications reserved | Data subject to change without notice
Document number: BST-BMP280-DS001-23 Revision_1.23_11202
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3.6.1 Sleep mode
Sleep mode is set by default after power on reset. In sleep mode, no measurements are performed
and power consumption (I
DDSM
) is at a minimum. All registers are accessible; Chip-ID and
compensation coefficients can be read.
3.6.2 Forced mode
In forced mode, a single measurement is performed according to selected measurement and filter
options. When the measurement is finished, the sensor returns to sleep mode and the measurement
results can be obtained from the data registers. For a next measurement, forced mode needs to be
selected again. This is similar to BMP180 operation. Forced mode is recommended for applications
which require low sampling rate or host-based synchronization.
time
current
I
DDSL
I
DDSB
I
DDP
I
DDT
POR Mode[1:
0] = 01
Measurement T
Measurement P Measurement P
Measurement P Measurement P
Measurement T
Measurement T
Measurement P Measurement P Measurement P Measurement P
Measurement T
Data readout
osrs_t osrs_p
Write
settings
Mode[1:0] = 01
Figure 3: Forced mode timing diagram
3.6.3 Normal mode
Normal mode 16ontinuously cycles between an (active) measurement period and an
(inactive) standby period, whose time is defined by t
standby
. The current in the standby period
(I
DDSB
) is slightly higher than in sleep mode. After setting the mode,measurement and filter
options, the last measurement results can be obtained from the data registers without the
need of further write accesses. Normal mode is recommended when using the IIR filter, and
useful for applications in which short-term disturbances (e.g. blowing into the sensor) should
be filtered.
time
current
I
DDSL
I
DDSB
I
DDP
I
DDT
POR Mode
[1:0
] = 11
Measurement T
Measurement P
Measurement P Measurement P
Measurement P
Measurement T Measurement T
Measurement P Measurement P
Measurement P Measurement P
Measurement T
Data readout
when needed
osrs
_t osrs
_p
Write
settings
t
standby
Figure 4: Normal mode timing diagram