Can MEMS oscillators replace quartz crystal oscillators?

[torus1000]

Hi,

Xtal oscillators are popular and used to the board such as MCIMX6Q-SDB and MCIMX7D-SDB.
Is it OK to replace Xtal oscillators with MEMS oscillators as following?

https://www.mouser.com/applications/mems-oscillators/
https://www.mouser.com/Passive-Components/Frequency-Control-Timing-Devices/Oscillators/Standard-Cloc...
32.768kHz
https://www.mouser.com/Passive-Components/Frequency-Control-Timing-Devices/Oscillators/Standard-Cloc...
24MHz
https://www.mouser.com/Passive-Components/Frequency-Control-Timing-Devices/Oscillators/Standard-Cloc...

Can anyone help me?

[igorpadykov · Accepted solution]

Hi torus1000

in general yes they can be replaced, based on frequency stability

described in i.MX6 System Development User’s Guide

https://www.nxp.com/docs/en/user-guide/IMX6DQ6SDLHDG.pdf

Probably one will have to place level shifter, please check datasheet of

specific mems chip and Development User’s Guide for necessary signal levels.

Best regards
igor
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[torus1000]

Dear Igor igorpadykov‌

> please check ... and Development User’s Guide for necessary signal levels.

Actually our client use MCIMX7D-SDB.
So I checked IMX7DSHDG.pdf then found follwing description.

https://community.nxp.com/message/820468?commentID=820468#comment-820468
https://www.nxp.com/docs/en/user-guide/IMX7DSHDG.pdf
  For RTC_XTALI VIL and VIH voltage levels, see the
  latest i.MX 7 series datasheet available at nxp.com.

But I couldn't find neither VIL nor VIH in the latest datasheet.

https://www.nxp.com/docs/en/data-sheet/IMX7DCEC.pdf
https://community.nxp.com/message/360353
  Unfortunately we do not have such detail information of the XTAL spec.

(Q1) Did your answer "necessary signal levels" mean VIL and VIH?

(Q2) If yes, where can I get VIL and VIH spec for RTC_XTALI and XTALI pins?

Thanks.

[igorpadykov]

Hi torus1000

>(Q1) Did your answer "necessary signal levels" mean VIL and VIH?

yes

Best regards
igor