AM625-Q1: Decoupling caps on Supply pin

Soumya Gutti

Part Number: AM625-Q1

Tool/software:

Hi,

As per the evaluation board schematics, there is a capacitor per pin(100nF) added for the duplicate pins?
Eg : 16 decoupling caps for 16 pins of VDD_CORE

Is it mandatory to use these many capacitors? Can we reduce caps?

Regards

Soumya

over 1 year ago

0 Kallikuppa Sreenivasa over 1 year ago

TI__Guru**** 234465 points

Hello Soumya

Thank you for the query.

The recommendation is to follow the PDN document.

https://www.ti.com/lit/an/sprac76g/sprac76g.pdf

Table 7-6. AM62xx PDN Targets and Decoupling Example

Alternatively the recommendation is to perform simulation to optimize the caps.

Regards,

Sreenivasa

+1 Kallikuppa Sreenivasa over 1 year ago in reply to Kallikuppa Sreenivasa

TI__Guru**** 234465 points

Hello Soumya

Please refer expert inputs on reducing the caps:

Valeo is looking to reduce the decaps on the VDD_CORE. I am suggesting them to follow the PDN. In case customer performs the required simulation and depending on the layout, I guess it should be possible to reduce the caps.

Expert reply:

Yes that is correct. They can reduce the number of decaps but they need to ensure they follow the PDN app note guidelines and meet the target impedance requirements for VDD_CORE.

Regards,

Sreenivasa

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AM625-Q1: Decoupling caps on Supply pin