Bosch MAN-REG-X-08 Especificaciones descargar pdf (Pagina 17)

Data sheet

BMA220

Page 17

BST-BMA220-DS003-08 | Revision 1.15 | August 2011 Bosch Sensortec

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.

5.2 Supported types of interrupts

The following interrupt modes are provided by the BMA220.

 Any-motion (slope) detection

 Tap/double-tap sensing

 Orientation recognition

 Low-g detection

 High-g detection

 Data-ready interrupt

5.3 Power-saving modes

In order to reduce power consumption of the sensor itself, the BMA220 supports a low-power

mode in which the ASIC wakes up periodically, checks whether any of the configured interrupt

conditions apply and then either goes back to sleep (no interrupt) or stays awake (interrupt).

The BMA220’s PMU (power management unit) controls the transitions from the ‘awake state’

into the ‘sleep state’ and vice versa.

In normal mode, the interrupt controller is permanently turned on to continuously process the

incoming data. In low-power mode, the interrupt controller will be turned on by the PMU once

the chip has fully woken up. The time it takes before the sensor can go back to sleep is

determined by the active interrupt engines. Once all active engines indicate that no interrupt

condition applies, the PMU will switch the sensor back into sleep state.

Furthermore the applied interrupt condition can be used not only to enable the low-power mode

of the sensor itself but for the whole system. This enables a dramatically reduced power

consumption of the whole system. The result is an extended operation and stand-by time e.g. of

mobile devices in an order of magnitude.

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Bosch MAN-REG-X-08 Especificaciones Pagina 17