RT1052 will not output DCDC_OUT voltage normally , DCDC_3V3 voltage is stable 2ms then output DCDC_OUT voltage but it wll drop to zero quickly, however the normal IC will output DCDC_OUT voltage after DCDC_3V3 voltage 3ms and keep 1.1V. For failed board, it always happen issue at the first power on. What may cause the problem？
Hi Kerry
DCDC IC and its circuit schematic I copied the EVKB board.
DCDC IN is ok, otherwise the DCDC_OUT pulse waveform can not be captured by Oscilloscope.
For POR wave I can not capture all the voltage waveform in the same time, DCDC_PSWITCH and DCDC IN like below
Hi Li Ping ,
Please check your RT1052 chip partnumber, is it A0 or A1 silicon?
To A0 Silocon, it has the high POR current errata:
So, maybe your DCDC drive ability also need to be checked, especially during the POR.
Wish it helps you!
If you still have questions about it, please kindly let me know.
Kerry
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Hi Kerry
My RT1052 chip is A1 silicon.
It is very strange that if DCDC IC drive is not enough the voltage drop should be captured by Oscilloscope but it can not be seen in the waveform. I use the same DCDC_out rail capacitors as the EVB board, the DCDC_OUT power rail just used by the RT1052 only, is there other errata may cause the problem?
Hi Li Ping,
Thanks for your updated information.
What's the DCDC IC you are using, the same chip MP2144GJ as the MIMXRT1050-EVKB board?
What's the DCDC_3V3 voltage you mean, do you mean DCDC_IN pin voltage?
Do you also check this POR wave:
Please give me reply ASAP, then I will help you to check with our hardware engineer.
Wish it helps you!
If you still have questions about it, please kindly let me know.
Kerry
-------------------------------------------------------------------------------
Note:
- If this post answers your question, please click the "Mark Correct" button. Thank you!
- We are following threads for 7 weeks after the last post, later replies are ignored
Please open a new thread and refer to the closed one, if you have a related question at a later point in time.
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