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PSoC 4 MCU

RoCa_1222471
New Contributor II

PSOC4000L datasheets says IMO clock accuracy to be ±2 percent accuracy across all frequencies with trim. The IMO trimming procedure is done on startup loading SFLASH trimmed values stored by custumer during production process. May these values differ from sample to sample or they are the same? Why an accuracy of only 2% is obtained? Could be possible to load different values to obtain a better accuracy of 2% (also without using WCO or USB lock functionality)?

Thank you

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1 Solution
JoMe_264151
Expert II

To reduce clock error you need to measure against a known precise clock which is done in the trimming process at the factory. Over the temperature range this value is exact to 2%. When a more precise clock is needed you are required to use a crystal as reference.

Bob

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3 Replies
JoMe_264151
Expert II

To reduce clock error you need to measure against a known precise clock which is done in the trimming process at the factory. Over the temperature range this value is exact to 2%. When a more precise clock is needed you are required to use a crystal as reference.

Bob

View solution in original post

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RoCa_1222471
New Contributor II

So you mean the factory trimming process is made by Cypress is made chip by chip and it is already made with the better accuracy is possible?

Roberto Casella

Electronic R&D Department

Da: "JoMe_264151" <community-manager@cypress.com>

A: "Roberto Casella" <roberto.casella@ave.it>

Inviato: Venerdì, 30 agosto 2019 11:35:13

Oggetto: Re: - IMO clock accuracy

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IMO clock accuracy

reply from https://community.cypress.com/people/JoMe_264151?et=watches.email.thread in PSoC 4 MCU Community - https://community.cypress.com/message/207710?et=watches.email.thread#207710

To reduce clock error you need to measure against a known precise clock which is done in the trimming process at the factory. Over the temperature range this value is exact to 2%. When a more precise clock is needed you are required to use a crystal as reference.

Bob

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NoriakiT_91
Employee

YES, PSoC has trimming value for IMO.  Please refer following document.

GS004521.png

PSoC 4200L Family PSoC 4 Architecture TRM, Document No. 001-97952

In addition, if PSoC 4200L is connected to a USB host, the IMO is calibrated with the SOF signal on the USB bus.

GS004522.png

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