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Question, i.MX28 power on issue DCDC_VDDD

Question asked by AVNET JAPAN FAE (team share account) on Feb 13, 2015
Latest reply on Feb 16, 2015 by igorpadykov

Dear team,


My customer is facing the issue that i.MX287 on the customer’s board does not boot-up.

The issue occurs on a board out of the customer proto-boards.

They measured the power supply rails of the board.

As the result, they saw DCDC_VDDD output is not normal at the time of power-up.

For the additional test, they remove the DCDC_VDDD connection and connect between VDDD and DCDC_VDDA. Then i.MX287 booted-up normally.

From the above, the customer believes that VDDD output from DCDC of the i.MX287 chip may be abnormal.

Please find the attached file for the power sequence measurement waveform.

From the fast that the issue occurs on only one board, they think it is a simple chip defect but cannot peel off the chip from the board because it is underfilled on the board.

Do you have any ideas on the cause of this issue?