BMI270 Wrist Wear Wakeup Angle Definitions

[Fishbone]

I really don't understand the wrist wake-up angles as specified in the datasheet:

 .min_angle_focus    - Minimum expected change in attitude angle in a 1

    //                       second period when moving within focus position.

    //                       Value is 2048 * cos(angle) (default: 1448 = 45 deg)

    //                       Range is 1024 to 1774 (60 to 30 deg)

    // .min_angle_nonfocus - Minimum expected change in attitude angle in a 1

    //                       second period when moving from non-focus position

    //                       to the focus position.

    //                       Value is 2048 * cos(angle) (default: 1774 = 30 deg)

    //                       Range is 1448 to 1856 (45 to 25 deg)

    // .max_tilt_lr        - Maximum tilt angle to the right that defines the

    //                       focus position.

    //                       Value is 2048 * sin(angle) (default: 1024 = 30 deg)

    //                       Range is 700 to 1024 (20 to 30 deg)

    // .max_tilt_ll        - Maximum tilt angle to the left that defines the

    //                       focus position.

    //                       Value is 2048 * sin(angle) (default: 700 = 20 deg)

    //                       Range is 700 to 1024 (20 to 30 deg)

    // .max_tilt_pd        - Maximum tilt angle to the front that defines the

    //                       focus position.

    //                       Value is 2048 * sin(angle) (default: 179 = 5 deg)

    //                       Range is 0 to 179 (0 to 5 deg)

    // .max_tilt_pu        - Maximum tilt angle to the back that defines the

    //                       focus position.

    //                       Value is 2048 * sin(angle) (default: 1925 = 70 deg)

    //                       Range is 1774 to 1978 (60 to 75 deg)

In particular, .max_tilt_pd and .max_tilt_pu.  I have tried different values, but they seems to have no effect.  In essence, I am trying to adjust the orientation that the sensor has to be in for the wrist wear wake-up to work.  I don't think it would kill Bosch to put a picture in their datasheet - but whatever.

[Fishbone]

Anyone?  Bueller?,,,

[BSTRobin]

Hi Fishbone,

From your second coordinate graph, it does not match the coordinates of Figure 3. This angle does not correspond to either. max_tiltpd or. max_tild_pu. We suggest that you take a video to see the parameters you need to adjust, or you redraw your coordinates based on the coordinates in Figure 3.

[Fishbone]

Sorry for the delayed response.  I guess my figure was pretty bad.  It was an attempt to show a "side-view" of the person, looking down at their watch.  What I am trying to do is adjust the tilt angle the wrist must be at to have the wrist wear wakeup interrupt execute.  So the y and z in the figure correspond to the y and z of figure 3.  

Let me ask another way.  Suppose I am standing with my arm in front of me and my wrist is oriented so that my watch face is straight up to the sky  like this:

Now suppose I have the watch in front of me but tilted so that  when I look directly in front of me, the watch looks like it does in Figure 3 above or like this:

How do I change this tilt angle?  Thank you in advance!!

[Fishbone]

Here is another pic explaining the difference (I think this explains the "tilt" angle I am concerned with):