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BT_CFG pins pulldowns necessary on RT1052?

Question asked by Josh Elijah on Feb 14, 2018
Latest reply on Jul 2, 2020 by Alvaro Pinto

I’m using the RT1052 in a system that will boot from QSPI NOR flash or a serial downloader.


(For reference, here are the design files i.MX RT1050 Evaluation Kit|NXP )


My intention is to breakout the following BT_CFG pins to a header so that I can configure the boot.








I want the remaining BT_CFG pins to be at logic 0.


My question is, do I need to pull them down externally?


Page 9, table 9 in the doc below suggests that I must not leave them floating


But I also read that they are, by default, they are pulled low on reset (see page 75, table 70)…


So which one is it, can I leave these pins unconnected and rely on the internal pulldowns, or do I need to connect them to ground externally?

Thanks in advance.