Is there a way to change start-up sequence of PF3001?

[durmus]

Hello everyone,

My custom board with iMX6UL just arrived and it is not detected by PC (via USB). I checked boot switches, voltage levels, etc. After some more investigation, I think power-up sequence might be the problem.

I use PF3001 with A7 option in my design. VDD_HIGH_IN is connected to SW2 output and VDD_SOC_IN is connected to SW1 output. I realized that datasheet says VDD_HIGH_IN must be powered before VDD_SOC_IN. However, in PF3001 A7 configuration, SW1 and SW2 have the same sequence number, which is 3.

If really that is the problem, what I want to do is to change start-up sequence so that SW2 is ready before SW1 is turned on. I realize that V33 output could have beed used for VDD_HIGH_IN. But right now, that is not an option.

PF100 has this TBB (try before buy) feature to allow changing start-up sequence. PF3001 datasheet does not mention it, but is there any way to change start-up sequence of PF3001?

Thanks.

[igorpadykov · Accepted solution]

Hi Durmuş

as described in sect.1 Orderable parts :

"The PF3001 is available with pre-programmed OTP memory configurations."

so seems there is no way to change power-up sequence or use TBB prototyping mode.

Best regards

igor

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