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MiNe_85951
Level 7
Level 7
Distributor - TED (Japan)
50 likes received 500 replies posted 50 solutions authored

Dear Sirs and Madams,

 

Please tell us about the accuracy of ECO used for PSoC4S.

We are currently using 24MHz external clock for my PSoC4S(CY8C4126AXI-S445).

 

(1)

The frequency setting described in Architecture TRM is "24MHz ≧ f > 17MHz".

Please tell us the acceptable ECO accuracy for this specified upper limit of 24MHz.

 

(2)

If I exceed  the specified upper limit of 24MHz, will it affect the operation of PSoC4S?

 

Regards,

3 Replies
Sidramesh_S
Moderator
Moderator
Moderator
250 sign-ins 100 replies posted 25 solutions authored

Hi @MiNe_85951 ,

I am looking into the documents.

You can refer to the below document section 7. Cypress Recommendations for External Crystal Oscillator (ECO) for more details on ECO.
https://www.infineon.com/dgdl/Infineon-AN95089_PSoC_4_PRoC_BLE_Crystal_Oscillator_Selection_and_Tuni...

Thanks and regards,
Sidramesh

MiNe_85951
Level 7
Level 7
Distributor - TED (Japan)
50 likes received 500 replies posted 50 solutions authored

Sidramesh-san,

 

Thank you for your support.

 

I have already reviewed this application note.

However, I thought that the content described in this application note was information about BLE devices.

Does it have to be within the below +/- 20ppm listed in Session 7 even for PSoC4 devices without BLE?

 

MaMi_1205306_0-1679099867844.png

 

Regards,

0 Likes
Sidramesh_S
Moderator
Moderator
Moderator
250 sign-ins 100 replies posted 25 solutions authored

Hi @MiNe_85951 ,

If your ECO is more accurate than IMO then no problem ECO frequency should be between 4 to 33MHz.

If it is less accurate then there are timing constraints for some blocks you have to make sure of that much accuracy.

Thanks and regards,
Sidramesh