BMP585 datasheet(20/71 Pages) BOSCH

20 / 71 page

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

4.4 Measurements

4.4.1 Pressure and temperature measurement enable

The BMP585 can either measure temperature only, or both temperature and pressure. Pressure-only measurement is

not supported, as temperature data is needed for the temperature compensation of the pressure data.1

Pressure and temperature will be measured if any of these conditions is true:



OSR_CONFIG.press_en ==1, or



FIFO_SEL.fifo_frame_sel == 0b10, or



FIFO_SEL.fifo_frame_sel == 0b11

If none of these settings is made, the sensor will measure temperature only.

4.4.2 Pressure and temperature oversampling ratio (OSR)

Oversampling extends the measurement time per measurement by the oversampling factor. Higher oversampling factors

offer decreased noise at the cost of higher power consumption.

Oversampling can be set individually for pressure and temperature in register fields OSR_CONFIG.osr_p and OSR_-

CONFIG.osr_t. The duration of the sampling phase is given by tconv_p and tconv_t. Table 7 shows the maximum ODR for

each oversampling setting. Recommended settings are shown in Table 9.

Table 9: Oversampling settings

Oversampling setting

osr_p

Pressure

oversampling

Temperature

oversampling

Typical

pressure

RMS noise

at 100 kPa

Typical ODR in

CONTINUOUS

mode

Lowest power

000

×1

0.78 Pa

498 Hz

001

×2

×1

0.58 Pa

374 Hz

Standard resolution

010

×4

×1

0.41 Pa

255 Hz

011

×8

×1

0.30 Pa

155 Hz

High resolution

100

×16

×1

0.21 Pa

87 Hz

101

×32

×2

0.15 Pa

46 Hz

110

×64

×4

0.11 Pa

24 Hz

Highest resolution

111

×128

×8

0.08 Pa

12 Hz

Note: The noise values refer to the sensor-intrinsic noise. Already at standard resolution, the noise or fluctuations of the

air pressure itself may be higher than the noise of the sensor, and thus be dominant. This ambient noise is typically

stronger at lower frequencies. Any increase of the ODR does not reduce this type of noise, because this frequency range

is of interest for many applications and thus is not attenuated by the sensor. If low frequency noise is a problem in a use

case, it is recommended to employ low pass filtering, for example by using the build-in IIR-filter.

4.4.3 Configuration changes in NORMAL and CONTINUOUS mode

If any of these changes is applied during NORMAL and CONTINUOUS mode:



OSR_CONFIG.press_en



OSR_CONFIG.osr_t



OSR_CONFIG.osr_p



ODR_CONFIG.odr (NORMAL mode only)

Measurements will restart with the new settings after treconf. If DEEP_SLEEP is enabled in NORMAL mode, it will start

after treconf_deep.

However, the sensor can be configured to output the pressure only data to the FIFO, see section 4.6.1 FIFO Configuration.

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