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What happen in usecase of i.MX6UL+PF3000-A4 series? 

Question asked by Mamoru Kanou on Nov 21, 2016
Latest reply on Nov 27, 2016 by Mamoru Kanou

Hi, community.

 

Our customer made the i.MX6UL custom board with PF3000-A4 + DDR3 (not DDR3L).

Although they made total 10 sets, one i.MX6UL board is broken with over-current issue.

After some investigation, they found that  DDR3 is short-circuited so huge current flows to i.MX6UL DDR3 IO Pads. 

Below picture is thermal photo.

 

Question:

We know that the power sequence of PF 3000-A4 does not meet the power sequence of i.MX 6 UL.

That is,

In the specification of iMX 6 UL power-up sequence must be VDD_HIGH_IN -> VDD_SOC_IN,

but In PF 3000-A4, power is turned on in the order of SW1B(VDD_SOC_IN) -> V 33(VDD_HIGH_IN).

 

Is there a possibility that the interface of DDR 3 will be destroyed in this case?

If this answer is yes, why DDR I/F is broken? 

 

Best Regards,

kanou

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