AM62A7-Q1: VPP capacitor

Hello Xingyu Zhu

Thank you for the query.

Could you help me understand the current design stage of the project.

C291 can be changed to 2.2 uF.

Also change C288 to 0.1 uF.

The VPP supply sees large current transients and decap is recommended.

Regards,

Sreenivasa

Thanks for your reply.

Kallikuppa Sreenivasa said:

Could you help me understand the current design stage of the project.

Customer is now designing their schematic.

Hello Xingyu Zhu

Thank you. I would suggest replacing C290 with a 1K discharge resistor.

Regards,

Sreenivasa

Hi Sreenivasa,

Thanks for your reply. Just curious, why our EVM don't use this 1K discharge resistor? Based on my understanding, discharge resistor is more useful for the larger value capacitor.

Hello Xingyu Zhu

Thank you. 

Please note that the EVMs do not represent actual customer implementation and could have some variations.

We have the schematics design and review checklist and the hardware design guide for reference during custom board design.

The Below FAQ includes link to these documents.

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1203305/faq-am62a7-and-am62a7-q1-custom-board-hardware-design-collaterals-to-get-started

The eFuse supply is enabled only during eFuse programming and needs to be timed.

The caps support the transient current requirements.

Once the power is off, it is preferred to discharge the caps connected to the VPP faster and the 1K is suggested to discharge the cap. The 1K also holds the VPP in pulldown condition.

Regards,

Sreenivasa