Current output from i.MX6DQ VDD_CACHE_CAP.

[satoshishimoda]

Hi community,

Our partner have a question about i.MX6DQ.

They want to know how much the current is output from VDD_CACHE_CAP.

We understood it should be shorted to VDDSOC_CAP, but didn't understand how bold line is needed between VDD_CACHE_CAP and VDDSOC_CAP about board layout since there is no current information.

Best Regards,

Satoshi Shimoda

[satoshishimoda]

Would you reply to this question?

Deadline for layout design is imminent, so I would appreciate it if you could give me a advice.

Best Regards,

Satoshi Shimoda

[Pavel]

The i.MX6 VDDSOC_CAP output current is not specified. We can estimate this current of 1-2A during power up. Use this estimation for trace widths and via sizes.

Have a great day,
Pavel

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[gusarambula · Accepted solution]

My apologies, Satoshi Shimoda,

I investigated but we do not have information of the current output from VDDSOC_CAP. VDD_CACHE_CAP is an input for the cache supply and is feed from VDDSOC_CAP.

One alternative is looking at the i.MX6 SABRE and use the same line width, which I would recommend.

Another option would be using the LDO maximum supply current in order to have a maximum value of the SOC supply current in order to determine how much VDDSOC_CAP can provide. According to Table 8 of the i.MX6Q Datasheet that would be around 2A and take that as an maximum in order to be safe.