AN2335 Datasheet, PDF (27/40 Pages) STMicroelectronics – This document is intended to give application

AN2335
Figure 12. DCRM bit function
FreeFall event
Duration THS
Duration
Counter value
FreeFall Interrupt
FreeFall event
Duration THS
Counter value
FreeFall Interrupt
FreeFall event
Duration THS
Counter value
FreeFall Interrupt
Duration
Duration
Free-Fall and Wake-Up Registers
B
C
8.5
FF_WU_DURATION_1 (33h)
Set the minimum duration of the free-fall, wake-up event that must be recognized by the
LIS302DL..
D7
D6
D5
D4
D3
D2
D1
D0
D7, D0
Duration value. Default value: 0000 0000
D7, D0 define the minimum duration of the programmed inertial event such as Free-Fall and
Wake-Up that must be recognized by the device. Duration step and maximum value depend
on the ODR chosen. For an output data rate of 400 Hz the register allows to set a duration
spanning from 0 to 637.5 msec with steps of 2.5 msec. Conversely when the output data
rate is set to 100 Hz it is possible to define an event duration spanning from 0 to 2.55 sec at
steps of 10 msec. The counter used to implement duration function is blocked when the LIR
bit in the configuration register is set to one and the interrupt event has occurred.
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