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Hello,
Customers are trying to place ferrite beads in the VDD and GND wiring as a noise countermeasure on the power supply line where switching power supplies are generated.
A bypass capacitor is already placed in the circuit. (0.1uF and 1uF for Vdd, 0.1uF for Vccd)
Are there any cautions on the circuit layout regarding the placement of bypass capacitors and ferrite beads?
MPN : CY8C4014SXI-420
Best Regards,
Naoaki Morimoto
Solved! Go to Solution.
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Yes, you should place Filter Capacitor to Controller closer as possible.
There is no spec about the actual value which is better to be close from Controller.
Infineon Technologies
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Have you checked PSoC hardware related application notes?
AN88619 - PSoC 4 Hardware Design Considerations
AN80994 - Design Considerations for Electrical Fast Transient (EFT) Immunity
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Hello TakashiM_61-san,
Yes, I referred to "AN85951 PSoC4 and PSoC6 MCU CapSense Design Guide" and "AN80994 Design Considerations for Electrical Fast Transient (EFT) Immunity".
I can refer to "Figure 15. Filters Near the Supply Pins of a Controller" of AN80994.
Should the Bypass Capacitor be placed closest to VDD / VSS, with L1, L2 and C1, C2 placed next?
How far do these components need to fit from the IC?
Best Regards,
Naoaki Morimoto
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Hello,
If there are no rules regarding the layout of bypass capacitors and ferrite beads, I will tell the customer the following:
-Place the bypass capacitor within 10 mm from the VDD / VSS pin of PSoC.
-Next, insert the ferrite beads into the VDD / VSS line.
If you are satisfied with this content, please close this case.
Best Regards,
Naoaki Morimoto
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Yes, you should place Filter Capacitor to Controller closer as possible.
There is no spec about the actual value which is better to be close from Controller.
Infineon Technologies
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Hello AikoO_51-san,
Thank you for your reply.
Please close this case.
Best Regards,
Naoaki Morimoto