Capacitors request for NVCC_EMCx power source.

[takayuki_ishii]

Hello community,

I have a question about supply capacitors request table.

In Table 1. Processor supply capacitors when on-chip DCDC regulators are used of document

Hardware Development Guide for the MIMXRT1160/1170 Processor , Rev. 2, 09/2021,

It say that

Power rail	0.1 μF	0.22 μF	1 μF	2.2 μF	4.7 μF	22 μF	Notes
NVCC_EMC1_X				1	1		Place2.2 μF under balls F6, F7
NVCC_EMC2_X				1	1		Place 2.2 μF under balls H6, J6

It is meaning that the three power lines(NVCC_EMC1_1, NVCC_EMC1_2, NVCC_EMC1_3) require one 2.2uF and one 4.7uF, one under the F6 ball and the other under the F7 ball.

Each of the three power lines does not individually require 2.2uF and 4.7uF.

Is this understanding is correct?

Best regards,

Ishii.

[PabloAvalos]

Hi @takayuki_ishii 

Thank you so much for using our community. I am here to assist you. I really appreciate your patience.

In order to help you with your request, may you clarify to me what do you mean with your question about each of those three power lines does not individually require those capacitors? Because based on the table, it says that each power line needs both capacitors.

I will stay tuned to your reply, so please let me know if you have more questions.

Best Regards.
Pablo Avalos.

[takayuki_ishii]

Hello @PabloAvalos 

Thank you for your reply.

And sorry my wrong question.

Power rail	0.1uF	0.22uF	1uF	2.2uF	4.7uF	22uF	Notes
NVCC_EMC1_X				1	1		Place under balls F7, G6

mean that

1)

Power rail	0.1uF	0.22uF	1.uF	2.2uF	4.7uF	22uF	Notes
NVCC_EMC1_1 NVCC_EMC1_2 NVCC_EMC1_3				1	1		Place under balls F7->2.2uF G6->4.7uF

or

2)

Power rail	0.1uF	0.22uF	1uF	2.2uF	4.7uF	22uF	Notes
NVCC_EMC1_1				1	1
NVCC_EMC1_2				1	1
NVCC_EMC1_3				1	1

Which is correct answer?

From schematic of RT1170-EVK, it seems that 1x 2.2uF and 1x 4.7uF for 3 ball(NVCC_EMC1_1, NVCC_EMC1_2, NVCC_EMC1_3) is correct.

Is it OK?

Best regards,

Ishii.

[PabloAvalos · Accepted solution]

Hi @takayuki_ishii 

Please accept my apologies for the delay, I was out of the office a couple of days due a personal situation. I highly appreciate your patience.

Regarding your question, and after double-checking, the correct one is as you mentioned at the end, as it shown on the diagram, 1 x 2.2uF + 1 x 4.7uF for all those 3 lines (F7/F6/G6).

Hope it was helpful, please let me know if you have more questions.

Thank you.
Best Regards.
Pablo Avalos.

[takayuki_ishii]

Hello @PabloAvalos 

Thank you for your reply.

Is the same rule applied to these two power lines?

Power rail	0.1uF	0.22uF	1uF	2.2uF	4.7uF	22uF	Notes
VDD_SOC_IN_x			2		3	1	Place 0402 under balls H8, J8, J9,J10, K10
NVCC_EMC2_X				1	1		Place under balls H6, J6

Best regards,

Ishii.