https://community.nxp.com/t5/S32K/S32K148-LPO-Clock-source-for-Watchdog-RTC-Is-it-reliable-for/m-p/1328210#M11779 <P>My product have sleep mode option.&nbsp; Can I use LPO Clock source for long term running in my product .I try to use these clock source in watchdog, RTC.&nbsp; Is it very Reliable ?&nbsp; &nbsp;If not , May I know the solution to the clock source for sleep mode ?&nbsp;</P> Tue, 24 Aug 2021 04:54:02 GMT kasirajan_chellaiah 2021-08-24T04:54:02Z https://community.nxp.com/t5/S32K/S32K148-LPO-Clock-source-for-Watchdog-RTC-Is-it-reliable-for/m-p/1328210#M11779 <P>My product have sleep mode option.&nbsp; Can I use LPO Clock source for long term running in my product .I try to use these clock source in watchdog, RTC.&nbsp; Is it very Reliable ?&nbsp; &nbsp;If not , May I know the solution to the clock source for sleep mode ?&nbsp;</P> Tue, 24 Aug 2021 04:54:02 GMT https://community.nxp.com/t5/S32K/S32K148-LPO-Clock-source-for-Watchdog-RTC-Is-it-reliable-for/m-p/1328210#M11779 kasirajan_chellaiah 2021-08-24T04:54:02Z https://community.nxp.com/t5/S32K/S32K148-LPO-Clock-source-for-Watchdog-RTC-Is-it-reliable-for/m-p/1328414#M11785 <P>Hi <a href="https://community.nxp.com/t5/user/viewprofilepage/user-id/188693">@kasirajan_chellaiah</a>,</P> <P>The LPO clock is not very precise:</P> <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="danielmartynek_0-1629793590155.png" style="width: 636px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/153844i1C68BB1B886C613C/image-dimensions/636x188?v=v2" width="636" height="188" role="button" title="danielmartynek_0-1629793590155.png" alt="danielmartynek_0-1629793590155.png" /></span></P> <P>The LPO can be trimmed (41.7.1.5 Low Power Oscillator Trim Register (LPOTRIM)).</P> <P>However, one step of LPOTRIM[4:0] gives about 3kHz difference in the LPO frequency.</P> <P>So, the RTC won't be precise.</P> <P>If you need the RTC to be precise, you would need to use RTC_CLKIN.</P> <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="danielmartynek_2-1629793929139.png" style="width: 692px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/153846iBBAED13C19F4DD5A/image-dimensions/692x189?v=v2" width="692" height="189" role="button" title="danielmartynek_2-1629793929139.png" alt="danielmartynek_2-1629793929139.png" /></span></P> <P>&nbsp;</P> <P>Regards,</P> <P>Daniel</P> <P>&nbsp;</P> Tue, 24 Aug 2021 08:33:50 GMT https://community.nxp.com/t5/S32K/S32K148-LPO-Clock-source-for-Watchdog-RTC-Is-it-reliable-for/m-p/1328414#M11785 danielmartynek 2021-08-24T08:33:50Z