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Hi.
I use PSoC 4100S Plus (CY8C4147AZI-S455).
I understand that the clock accuracy of IMO is ± 2%, which is a data sheet.
However, IMO clock accuracy must be ± 1% under the following conditions.
- Temperature range :-10℃~70℃
- Voltage :5V±0.25V
Is there a way to guarantee IMO clock accuracy ± 1%?
Could you help me to realization even a little.
Solved! Go to Solution.
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Asanuma-san,
To get a better accuracy of IMO, user can choose "Trim with WCO" for IMO.
For more details about trimming with WCO, refer IMO Accuracy for PSoC 4 - KBA226843
Best Regards,
Ryan
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Asanuma-san,
To get a better accuracy of IMO, user can choose "Trim with WCO" for IMO.
For more details about trimming with WCO, refer IMO Accuracy for PSoC 4 - KBA226843
Best Regards,
Ryan
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Dear Ryan-san
Thank you for your answer.
Does WCO need to use an external oscillator?
Best Regards,
asanuma
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Asanuma-san,
Yes. WCO needs to use an external 32K crystal oscillator. The chip has a pair of dedicated pins (I remember it's P0[4] and P0[5]) for the external crystal.
Best Regards,
Ryan
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Dear Ryan-san
Thank you for your answer.
No external oscillator used in this project.
Is it possible to approach ± 1% with only the internal oscillator?
Best Regards,
Asanuma
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Dear Asanuma-san,
Sorry for that, even with the smooth working temperature (-10℃ ~ 70℃), it is hard to say we can guarantee ± 1% with only the internal osc. But it must be better than ± 2%. I checked some char data, with -10℃ ~ 70℃, the accuracy performance could approach ± 1.25% .
Best Regards,
Ryan
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Dear Ryan-san
Thank you for your answer.
Best Regards,
Asanuma