PSoC 4100S Plus IMO

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taas_3144281
Level 5
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Distributor - Marubun (Japan)
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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.

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1 Solution
RyanZhao
Moderator
Moderator
Moderator
250 sign-ins First question asked 750 replies posted

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

pastedImage_0.png

Best Regards,

Ryan

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6 Replies
RyanZhao
Moderator
Moderator
Moderator
250 sign-ins First question asked 750 replies posted

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

pastedImage_0.png

Best Regards,

Ryan

taas_3144281
Level 5
Level 5
Distributor - Marubun (Japan)
25 sign-ins 50 replies posted 25 replies posted

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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taas_3144281
Level 5
Level 5
Distributor - Marubun (Japan)
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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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taas_3144281
Level 5
Level 5
Distributor - Marubun (Japan)
25 sign-ins 50 replies posted 25 replies posted

Dear Ryan-san

Thank you for your answer.

Best Regards,

Asanuma

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