Datasheet

Bosch Sensortec

| BMI088 Data sheet

13 |

Modifications reserved | Data subject to change without notice

Document number: BST-BMI088-DS001-1

Revision_1.3_05201

4. Functional Description

4.1 Power Management and Power Modes

The BMI088 has two distinct power supply pins:

• VDD is the main power supply for the internal blocks

• VDDIO is a separate power supply pin mainly used for the supply of the interface

There are no limitations on the voltage levels of both pins relative to each other, as long as each of them

lies within its operating range. Furthermore, the device can be completely switched off (VDD = 0V) while

keeping the VDDIO supply on (VDDIO > 0V) or vice versa.

When the VDDIO supply is switched off, all interface pins (CSB, SDI, SCK, PS) must be kept close to

GND

potential.

The device contains a power-on reset (POR) generator. It resets the logic part and the register values

after powering-on VDD and VDDIO. This means that all application specific settings which are not equal

to the default settings (refer to 6.2 register map accelerometer and to 8.2 register map gyroscope), must

be changed back to their designated values after POR.

Please note: the POR resets also the interface. For the gyroscope part, the interface is defined by the

voltage level on the PS pin. The interface of the accelerometer part is defined by the voltage level of the

CSB1 pin at the moment when the POR is initiated (see chapter 3).

4.1.1 Power Modes: Accelerometer

The power state of the BMI088 accelerometer is controlled through the register ACC_PWR_CTRL. The

To enter normal mode, the value 0x04 must be written to ACC_PWR_CTRL.

To enter suspend mode, register ACC_PWR_CTRL must be cleared.

Note: the sensor is in suspend mode after reset (POR or soft-reset), thus the user actively needs to

enter normal mode in order to obtain acceleration values.

Note: after POR or soft-reset, the acceleration sensor needs up to 1ms boot time. When changing

power modes, the sensor needs up to 5ms to settle. Any communication with the sensor during this

time should be avoided.