BMP388 datasheet(10/57 Pages) BOSCH

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Bosch Sensortec | BMP388 Datasheet

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Modifications reserved |Data subject not change without notice | Printed in Germany

Document number: BST-BMEP388-DS001-01 Revision_1.1_032018

3.2.

Power management

The BMP388 has two separate power supply pins



VDD is the main power supply for all internal analog and digital regulator blocks.



VDDIO is a separate power supply pin, used for the supply of the digital interface.

VDD and VDDIO pins can be energized in any order.

A power-on reset generator is built in which resets the logic circuitry and the register values after the power-on sequence.

The slope for ramp up time must not be less than 10 ms. After powering up, the sensor settles in sleep mode (see section

3.3).

Completion of the power-on-reset or soft reset is indicated by the bit por_detected[0]. The bit is cleared after reading.

Holding any interface pin (SDI, SDO, SCK or CSB) at a logical high level when VDDIO is switched off can permanently damage

the device due caused by excessive current flow through the ESD protection diodes.

3.3.

Power modes

The BMP388 offers three power modes: sleep mode, forced mode and normal mode. These can be selected using the

mode[1:0] bits in control register “pwr_ctrl”.

Table 4: mode settings

mode[1:0]

Mode

Sleep mode

01 and 10

Forced mode

Normal mode

3.3.1. Sleep mode

Sleep mode is set by default after power on reset. In sleep mode, no measurements are performed and power consumption

(IDDSL) is at a minimum. All registers are accessible; Chip-ID and compensation coefficients can be read.

3.3.2.

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. Forced mode is recommended for applications

which require low sampling rate or host-based synchronization.

time

ISLEEP

IIDLE

IMEAS, P

IMEAS, T

POR

Mode[1:0] = 01

Data readout

osrs_t

osrs_p

Write

settings

Mode[1:0] = 01

Figure 2: Force mode timing diagram

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