Bosch MAN-REG-X-08 Specifications download pdf (Page 16)

Data sheet

BMA220

Page 16

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. Interrupt controllers

The BMA220 integrates a programmable interrupt controller. It can be configured via SPI/I

C to

monitor individual axes (X-, Y- and Z-axis) and check whether certain conditions apply (e.g. the

acceleration on one axis exceeds a certain threshold). The interrupt controller of the BMA220 is

capable of checking for certain conditions simultaneously.

If at least one of the configured conditions applies, an interrupt (logic ‘1’) is issued through the

INT pin of the sensor. More details about the triggering condition (e.g. the type of the interrupt or

the axis that triggered the interrupt) are saved in internal status registers and can be read out

through the digital interface.

It is recommended to reset the interrupt controller by setting reset_int to '1' when the

interrupt settings has been set or changed.

5.1 Latched vs. non-latched modes

The interrupt controller can be used in two modes

 Latched mode: Once one of the configured interrupt conditions applies, the INT pin is

asserted and must be reset by the external master through the digital interface.

 Non-Latched mode: The interrupt controller clears the INT signal once the interrupt

condition no longer applies.

The interrupt output can be programmed by lat_int[2:0] to be either unlatched (‘000’) or latched

permanently (‘111’) or have the latch time of 0.25s(‘001’)/0.5s(‘010’)/1s(‘011’)/2s(‘100’)/4s

(‘101’)/8s(‘110’). The setting of these bits applies to all types of interrupts.

Figure 5: Interrupt output

Interrupt int from

interrupt enigne

interrupt output

unlatched

latched for certain

time

latched permanently

latch time

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 62 63

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Bosch MAN-REG-X-08 Specifications Page 16