BMP581 datasheet(18/75 Pages) BOSCH

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Bosch Sensortec | BST-BMP581-DS004-11

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Document number: BST-BMP581-DS004-11

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

ODR is not necessarily a value that is selectable via the ODR register. The resulting ODRs for the recommended OSR

settings are shown in Table 9.

4.3.7 Mode transitions

To go in STANDBY status the user must write ODR_CONFIG.pwr_mode = 0b00. The maximum transition time to

STANDBY is tstandby. The effective status of the device is always observable reading back the same register. After a

commanded switch to standby, the user either needs to wait for tstandby or check the status register for a successful

switch, before he can command the device to go to another mode, and before writing to any of the registers named in

3.3.8.

From STANDBY, it can be switched to CONTINUOS, FORCED or NORMAL mode by writing

ODR_CONFIG.pwr_mode register. Directly after the transition to an active mode, the first measurement will be

performed. It is recommended to set the desired measurement configuration, before switching the mode.

4.3.8 Mode-depending register write restrictions

A number of registers and register fields can only be updated when the device is in STANDBY mode. These are for

example the registers for NVM operations (see 3.8), but also configuration registers for the FIFO and IIR configuration.

The register descriptions state if this limitation applies to a register field. Write operations to these registers in a mode

other than STANDBY are lost. It is generally recommended to write configurations before switching into the

measurement mode.

4.3.9 Post-power-up procedure

After power up of the BMP581, it is available after t_powerup. The host should not initiate any communication with the

BMP581 before. Depending on the interface configuration, a dummy read should be the first access to the device (see

4.1).

It is recommended that the host checks the following status registers after a power-up:



read out the CHIP_ID register and check that it is not all 0



read out the STATUS register and check that status_nvm_rdy==1, status_nvm_err == 0



read out the INT_STATUS.por register field and check that it is set to 1; that means INT_STATUS==0x10

4.3.10 Soft reset

BMP581 can be reset by writing 0xB6 to the CMD register. The BMP581 will come out of the reset after tsoft_res.

Softreset must not be triggered during a NVM user programming sequence.

4.4 Measurements

4.4.1 Pressure and temperature measurement enable

The BMP581 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.4

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 However, the sensor can be configured to output the pressure only data to the FIFO, see Chapter 3.6.1

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