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Hello,
We have some voltage spikes each 330 ms on AVDD. If we do not considering those spikes, we have a ripple less than 20 mV, in according to the AVDD CYUSB306X datasheet specification.
The question are, can we neglect those voltage spikes that appears each 330 ms while we have a ripple less than 20 mV?
If we can neglect this, what impact can cause those voltage spikes?
And can we replace the ferrite by a resistor for filtering those spikes correctly ?
Thanks for your answer.
Below the schematic:
Solved! Go to Solution.
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Hi,
- If the spike is less than 20mV it should not be a problem.
- Try to increase decoupling capacitance on AVDD and check if the spike reduces.
- Is CVDDQ power shared with any other power domain?
Regards,
Hemanth
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Hi,
Wish among the channels measures AVDD? (and what are the other channels?)
Regards,
Hemanth
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Hi,
It's the yellow channel that measure the AVDD signal and the red channel measure the output of the DC/DC P1V2 convertor.
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Hi,
- If the spike is less than 20mV it should not be a problem.
- Try to increase decoupling capacitance on AVDD and check if the spike reduces.
- Is CVDDQ power shared with any other power domain?
Regards,
Hemanth
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Hi,
Thanks for your answer.
The Spike is over 20mV because we measure 23mV.
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Okay. Then please try to add more capacitance to that pin and see if the spike voltage reduces.
Regards,
Hemanth