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Joseph Lehman
Joseph Lehman
Associate
February 23, 2018
Question

LISD2E12 INT1_THS not changing tilt threshold

  • February 23, 2018
  • 10 replies
  • 2299 views
Posted on February 23, 2018 at 21:28

The INT1_THS register value does not seem to change the threshold at which an event is triggered. I can read and write the INT1_THS(0x32) so I know my writes are working. I poll the INT1_SRC register and watch the bits change so the position enable ints are working it is just that the threshold seems fixed not adjustable.

INT1_CFG = 0xCF to enable X & Y position triggering

INT1_THS = 0x20 = 0.5g or 30 degrees. (actual int flags trip around 0.94g/66 degrees)

Thanks in advance for any help.

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    10 replies

    Miroslav BATEK
    ST Employee
    February 26, 2018
    Posted on February 26, 2018 at 10:48

    Can you please try INT1_CFG = 0xFF configuration and see it works as you want.

    The INT1_THS register value change the threshold. I think there is misunderstanding with the sensitive axis as you enable only X and Y.

    Joseph Lehman
    Joseph LehmanAuthor
    Associate
    February 26, 2018
    Posted on February 26, 2018 at 22:33

    I was intentional in only enabling X & Y.  Doe the threshold not apply to all axis?

    Miroslav BATEK
    ST Employee
    February 27, 2018
    Posted on February 27, 2018 at 16:22

    The threshold apply to all axis.

    If you enable only X and Y axis following positions will be detected.

    0690X00000609plQAA.png
    Joseph Lehman
    Joseph LehmanAuthor
    Associate
    April 13, 2018
    Posted on April 13, 2018 at 13:49

    Solved! For those who follow this thread in the future.  In order to get a position threshold below 45 degrees or 0.7g to work, one of the axis must be disabled in the REG1_CFG so disabling in INT1_CFG is not enough, but the whole axis must be disabled in REG1_CFG

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