Why VGEN5 is changed from 2.8V to 3.0V on i.MX6Q SABRE?

[satoshishimoda]

Hi community,

Our customer have a question about i.MX6DQ SABRE and Linux BSP.

Please see the schematics of i.MX6Q SABRE platform, VGEN5_2V8 is used for VDDHIGH_IN power supply.

And VGEN5 is changed the output voltage from 2.8V to 3.0V by u-boot.

Our customer want to know why it is changed to 3.0V.

We know the min voltage to i.MX6DQ VDDHIGH_IN has been changed to 2.7V, so we think 2.8V supply from VGEN5 is no problem.

Although, the voltage changing has been remained in u-boot of latest BSP.

Would you let me know the reason?

Best Regards,

Satoshi Shimoda

[art · Accepted solution]

The VGEN5 voltage is increased to 3.0V to make it able to supply the VDD_SNVS_IN rail in full run mode as well.

Have a great day,
Artur

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[satoshishimoda]

Dear Artur,

Would you reply my above question?

Our customer want to know the meaning of "full run mode".

Best Regards,

Satoshi Shimoda

[art]

As "full run mode" I mean the mode when all supply voltages, including VDD_HIGH_IN, are applied to the processor.

Artur

[satoshishimoda]

Dear Artur,

Thank you for your reply.

> The VGEN5 voltage is increased to 3.0V to make it able to supply the VDD_SNVS_IN rail in full run mode as well.

Did you mean " To supply when VDD_SNVS_IN draw 1mA since VSNVS can supply up to 400uA"?

Best Regards,

Satoshi Shimoda