Hi, i found my board w/ iMX6Q + PMIC cannot boot up, and the power of VDDARM_CAP and VDDCORE_CAP power issue: huge voltage drop while power on, from 1.1V down to 0.5V then up to 1.1V again. but the input power VDDARM and VDDCORE are stable.what's wrong?

nealli · ‎08-03-2016

and i cannot use OTG to upgrade the firmware, because PC cannot recogenize the OTG port. anybody can help?

igorpadykov · ‎08-15-2016

Hi Li

please check Chapter 8 Avoiding Board Bring-up Problems

i.MX6 System Development User’s Guide

Best regards

igor

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nealli · ‎08-15-2016

i also measured these power PI on SDB CRB, and same issue with my board.

and if i power on VDDHIGH_IN before VDDCORE and VDDARM, then this issue disappeared.

please double check with CRB.

igorpadykov · ‎08-15-2016

right, recommended to power VDDHIGH_IN before other power supplies,

immediately after VDD_SNVS_IN, as it is done on i.MX6QP SPF-28857

with MMPF0100F9.

~igor