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KW31Z constantly resetting

Question asked by Frank Strazzabosco on Feb 6, 2017
Latest reply on Jan 11, 2018 by Gerardo Rodríguez

I'm bringing up a new virgin MKX31Z board. I have it configured the DCDC converter for auto buck mode.

I'm supplying the VDCDC_IN with 3.6V for an external supply.

The VDD_1P8OUT pin is sitting at 1.7V

The VDD_1P5OUT pin is sitting at 1.64V

The RESET_b line is constantly asserting a 100uS period. It goes high approx 2.5uS and stays lows for approx 97.5uS

I was trying to connect to it w/ a modified FRDM-KW41Z eval board with using the OpenSDA Interface when I found that the new board just sits there constantly driving the RESET_b signal.

There is no way to gain control over the uC with it constantly resetting.

I read through all I can to try and figure out why the reset line would be behaving that way and I can not find anything to help.

What can be going on?

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