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RT 1050 DCDC_IN rail

Question asked by Martin Smith on Jul 31, 2018
Latest reply on Aug 5, 2018 by Yuri Muhin

Hi, I'm working on a custom PCB and am having trouble powering the RT1052 processor.

I bring up the VDD_SNVS and then the 3V and 1V8 rails using LDOs. There is a 1ms delay (RC circuit) between the 3V rail and the DCDC_PSWITCH pin.

The problem I'm getting is that the 3V rail doesn't come up beyond 1V. I can scope the POR pin via a TP and that does go high to show the 3V rail is up but then goes low again and repeats every 250ms or so.

Any ideas what could be the problem?

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