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IMO accuracy with 32.768-kHz External Crystal Oscillator | Cypress Semiconductor

IMO accuracy with 32.768-kHz External Crystal Oscillator

Summary: 3 Replies, Latest post by Bob Marlowe on 19 Oct 2016 12:20 AM PDT
Verified Answers: 0
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joh9_1534041's picture
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61 posts

Hello,

what is the IMO percent accuracy over the full temperature and voltage range with a 32.768-kHz External Crystal Oscillator (PLL Mode)?

I read in (AN2027 PSoC® 1 - 32.768-kHz External Crystal Oscillator) "the IMO can be as accurate as the ECO itself". Does this mean the IMO operate with a CM7V-T1A (http://www.microcrystal.com/images/_PDF/3_Crystal_Ceramic-Package/cm7v-t...) 0.01%?

Thank you

user_1377889's picture
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9596 posts

You're right.

Precision of the crystal was listed as 100ppm = 0.000001 * 100 which is 0.0001 = 0.01%

this is nearly one minute/year.

The 20ppm version is even more precise. Resulting in a devitation of about 10s/a

 

Bob

joh9_1534041's picture
User
61 posts

Thank you very much, Bob! Stands "10s/a" for "10 seconds/year"?

user_1377889's picture
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9596 posts

Yes, "a" is the physics abbreviation for "annum" which is "year"

 

Bob

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