Datasheet

Preliminary Data Sheet

BMA400

Page 44 /

Confidential

BST-BMA400-DS000-00 | Version 0.1 | November 2017 Bosch Sensortec

BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.

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

Generic Interrupt 1 and 2

The generic interrupts 1 and 2 have the exact same implementation. They are designed to detect

activity or inactivity.

The generic interrupt monitors acceleration change with respect to a reference, or in other words, the

difference between actual acceleration and reference is calculated and compared against a threshold.

The comparison is de-noised using a hysteresis.

The generic interrupt is triggered when the above mentioned difference lasts for a minimum time.

Reference, threshold, hysteresis and duration are configurable.

Both generic interrupts work the same way, but have separate sets of registers to be processed

independently of each other.



Generic interrupt 1 is enabled by ‘INT_CONFIG0.gen1_int_en = 1’



Generic interrupt 2 is enabled by ‘INT_CONFIG0.gen2_int_en = 1’

The generic interrupt supports selectable acceleration axes for evaluation:

GEN(1/2)INT_CONFIG0.act_(x/y/z)_en.

GEN(1/2)INT_CONFIG1.comb_sel selects if the interrupt shall be based on an AND (comb_sel = 1)

or an OR (comb_sel = 0) combination of all enabled axes.

The acceleration data source is selectable between acceleration from acc_filt1 or acc_filt2 by setting

GEN1/2INT_CONFIG0.data_src (0: acc_filt1, 1:acc_filt2).

The data rate for the filter output must be 100Hz. Using acc_filt2 is recommended. In this case acc_filt1

can be used independently from the interrupt engine for the data output registers and the FIFO.

Figure 1:Signal flow for generic interrupt

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