LIS2DS12 datasheet(24/68 Pages) STMICROELECTRONICS

24 / 68 page

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LIS2DS12

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DocID027753 Rev 4

5.2

Activity/Inactivity function

The Activity/Inactivity recognition function allows reducing the power consumption of the

system in order to develop new smart applications.

When the Activity/Inactivity recognition function is activated, the LIS2DS12 is able to

automatically go to 12.5 Hz sampling rate and to wake up as soon as the interrupt event has

been detected, increasing the output data rate and bandwidth.

With this feature the system may be efficiently switched from low-power mode to full

performance depending on user-selectable positioning and acceleration events, thus

ensuring power saving and flexibility.

The Activity/Inactivity recognition function is activated by writing the desired threshold in the

WAKE_UP_THS (33h) register. The high-pass filter is automatically enabled.

If the device is in Sleep (Inactivity) mode, when at least one of the axes exceeds the

threshold in the WAKE_UP_THS (33h) the device goes into Sleep-to-Wake (as Wake-Up).

Activity/Inactivity threshold and duration can be configured in the control registers:

WAKE_UP_THS (33h)

WAKE_UP_DUR (34h)

LIS2DS12 데이터시트(PDF) 24 Page - STMicroelectronics