LIS2DW12: FIFO-Threshold-Interrupt Jitters at 1.6kHz

[Loris Wyss]

Hello ST-Community!

When I'm using the LIS2DW12 at ODR=1.6kHz, the Interrupt for reaching the FIFO-Threshold is jittering with 1/ODR, but only if the threshold is greater than 12. If it's less or equal, everything is working fine.

The buffer-Mode is set to FIFO-Mode, but this behaviour also occurs in Continous-Mode.

The Power-Mode is set to High-Performance/Low-Noise.

The Interrupt is routed to the INT1-Pin

The two images show the rising edge on the pin INT1. The time between the two cursors "a" and "b" is 624us (almost 625us), which would equal to 1/ODR (1/1600 = 625E-6)

As written, this only happens if ODR is set to 1.6kHz and the FIFO-Threshold is greater than 12.

Does anyone have some further informations regarding this issue?

Thanks in advance for your answers!

Greetings,

Loris

[Loris Wyss]

Hi @Eleon BORLINI​ 

I hope you're still doing well.

Have you got any news for me? Have you been able to reproduce the jitter or atleast put the pcb in operation?

If not, can you guarantee that I will get some results from you until the end of next week (10th of July '20)?

Else I would open an OLS request to get support on this issue.

Thanks and Regards,

Loris

[Eleon BORLINI]

Hi @Loris Wyss​ , tomorrow I'll be in lab with some time for this test, and I'll update you in any case by this week with the results I'll get. In case these outputs will not be conclusive, as you say it will be better to contact the OLS. Regards

[Loris Wyss]

Ok, thanks for your quick response. I''ll wait with opening the OLS until I got your results.

If you need support tomorrow, I'm available basically the whole day, so I could give you support here, over E-Mail, or in a phone call.

Regards, Loris

[Loris Wyss]

Hi @Eleon BORLINI​ 

My OLS case (https://community.st.com/s/case/5003W000002fTVZQA2) is now supported by Mr. Martin Polacek.

Did he contact you?

Do you still have the PCB I sent you? If so, I think it would make sense to ship this to Mr. Polacek.

Could you please quickly sum up, what the current status is?

Thanks and Regards,

Loris

[Eleon BORLINI]

Hi @Loris Wyss​ , I confirm Martin contacted me, asked for details and I explained him the status of my analysis. I also asked him if I had to ship the board, but he didn't get me a feedback on this point. However, I'll ship it to him tomorrow since you asked me to do so (I did't understand if you already shipped him another board or not). Regards

[Loris Wyss]

Hi @Eleon BORLINI​ 

Thanks for your answer.

No, I didn't ship another Board, so thanks for your offer to ship the board to Martin.

Regards,

Loris