BMP585 datasheet(18/71 Pages) BOSCH

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Bosch Sensortec

| BST-BMP585-DS003-02

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Document number: BST-BMP585-DS003-02

as well as in the event of applications for industrial property rights

4.3.3 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. Forced mode is recommended for

applications which require very low sampling rate or host-based synchronization. Forced mode may also be used if an

ODR higher than 240 Hz is needed.

4.3.4 NORMAL mode

Normal mode performs pressure measurements with a configurable frequency, which is the output data rate (ODR). The

ODR can be set in ODR_CONFIG.odr. Normal mode continuously cycles between an (active) measurement period and

an (inactive) standby period. In normal mode, the most recent measurement result can be directly obtained from the data

registers. Alternatively, the latest measurement results can be obtained from the FIFO.

Normal mode is recommended if pressure needs to be sampled in regular intervals, but none of the conditions apply

where FORCED and CONTINOUS mode may be favorable.

The ODR_CONFIG.odr register field is used to define the output data rate (ODR) if the BMP585. Data rates between

0.125 and 240 Hz can be selected. For the full list of available ODRs, see the register description. Not all combinations

of OSR and ODRs are valid, as measurement times may not fit into an ODR cycle. Table 7 shows the maximum ODR for

a given ODR setting.

Table 7: maximum nominal ODR setting per OSR settings in NORMAL mode

max ODR

[Hz]

OSR_T

128

240.00

200.00

130.00

80.00

40.00

240.00

220.00

180.00

120.00

70.00

40.00

220.00

200.00

180.00

140.00

100.00

70.00

40.00

140.00

130.00

120.00

100.00

80.00

50.00

35.00

80.00

70.00

50.00

45.00

30.00

45.00

40.00

35.00

30.00

20.00

15.00

128

10.00

5.00

Table 8: Maximum nominal ODR setting per OSR settings in NORMAL mode for temperature only measurements

max ODR

[Hz]

OSR_T

128

240.00

200.00

130.00

80.00

40.00

Configuration Check. BMP585 has an automatic configuration checking, which is functional in NORMAL mode and when

both temperature and pressure measurements are enabled. If a configuration is not valid, this will be indicated by the

OSR_EFF.odr_is_valid register field. If a measurement with an invalid setting is started, the BMP585 will run with the

specified ODR, but use a default setting for the ODRs:



For ODRs ≥ 160Hz, both OSRs will be set to 1



For all ODRs <160Hz, both OSRs will be set to 2



The effective ODRs are available in the register fields OSR_EFF.osr_t_eff and OSR_EFF.osr_p_eff. This action of

alignment and check is done in NORMAL mode only.

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