BMA150 datasheet(45/55 Pages) ETC2

45 / 55 page

Data sheet

BMA150

Triaxial, digital acceleration sensor

Bosch Sensortec

Rev. 1.5

Page 45

30 May 2008

as copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.

Note: Specifications within this document are subject to change without notice.

7. Operation modes

7.1 Normal operational mode

In normal operational mode the sensor IC can be addressed via digital interface. Data and

status registers can be read out and control registers and EEPROM values can be read and

changed. In parallel to normal operation the user has the option to activate several internal logic

paths and set criteria to trigger the interrupt pin. BMA150 is designed to enable low current

consumption of 200µA in operational mode.

A self-test procedure can be started in operational mode for testing of the complete signal

evaluation path including the micro-machined sensor IC structure, the evaluation ASIC and the

physical connection to the host system.

7.2 Sleep mode

Sleep mode is activated by setting a control bit. In sleep mode no communication with the

sensor IC is possible – all read and write commands are forbidden. The recommended

command to switch to operational mode is the wake-up call.

Wake-up time from sleep to operational mode is 1ms.

In case of a soft-reset, it is recommended to do this reset after having switched from sleep to

operational mode. In this case the total typical wake-up and reset time at maximum bandwidth is

"switching to operational mode = 1ms" and "time after soft reset until acceleration data is

available = 1.3ms", i.e. 2.3ms in total.

In case a soft-reset is activated during sleep mode it can take up to 30ms until normal operation

has resumed.

The current consumption in sleep mode is 1µA.

7.3 Wake-up mode

In general BMA150 is attributed to low power applications and can contribute to the system

power management.

•

Current consumption 200µA operational

•

Current consumption 1µA sleep mode

•

Wake-up time 1ms

•

Start-up time 3ms

•

Data ready indicator to reduce unnecessary interface communication

•

Wake-up mode to trigger a system wake-up (interrupt output to master)

when motion detected

•

Low current consumption in wake-up mode

The BMA150 provides the possibility to wake up a system master when specific acceleration

values are detected. Therefore the BMA150 stays in an ultra low power mode and periodically

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