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BMA255

Data sheet

Page 26

BST-BMA255-DS004-05 | Revision 1.2 | August 2014

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.

4.7 Interrupt controller

The BMA255 is equipped with eight programmable interrupt engines. Each interrupt can be

independently enabled and configured. If the trigger condition of an enabled interrupt is fulfilled,

the corresponding status bit is set to ´1´ and the selected interrupt pin is activated. The BMA255

provides two interrupt pins, INT1 and INT2; interrupts can be freely mapped to any of these

pins. The state of a specific interrupt pin is derived from a logic ´or´ combination of all interrupts

mapped to it.

The interrupt status registers are updated when a new data word is written into the acceleration

data registers. If an interrupt is disabled, all active status bits associated with it are immediately

reset.

4.7.1 General features

An interrupt is cleared depending on the selected interrupt mode, which is common to all

interrupts. There are three different interrupt modes: non-latched, latched, and temporary. The

mode is selected by the (0x21) latch_int bits according to Table 10.

Table 10: Interrupt mode selection

(0x21)

latch_int

Interrupt mode

0000b

non-latched

0001b

temporary, 250ms

0010b

temporary, 500ms

0011b

temporary, 1s

0100b

temporary, 2s

0101b

temporary, 4s

0110b

temporary, 8s

0111b

latched

1000b

non-latched

1001b

temporary, 250µs

1010b

temporary, 500µs

1011b

temporary, 1ms

1100b

temporary, 12.5ms

1101b

temporary, 25ms

1110b

temporary, 50ms

1111b

latched

An interrupt is generated if its activation condition is met. It can not be cleared as long as the

activation condition is fulfilled. In the non-latched mode the interrupt status bit and the selected

pin (the contribution to the ´or´ condition for INT1 and/or INT2) are cleared as soon as the

activation condition is no more valid. Exceptions to this behavior are the new data, orientation,

and flat interrupts, which are automatically reset after a fixed time.

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