topic Re: default analog pin needs pull-up or pull-down? in Kinetis Microcontrollers

default analog pin needs pull-up or pull-down?

okubohitoshi — Tue, 17 Dec 2013 12:44:19 GMT

When the pin muxing mode is configured for analog pin (default), the port needs pull-up or pull-down resistor ?

Jorge_Gonzalez — Tue, 17 Dec 2013 18:51:15 GMT

Hello okubo:

If configured for analog, the internal pullup/pulldown settings have no effect and they are disabled.

Or maybe you refer to a need for external resistors?

Regards!

Jorge Gonzalez

okubohitoshi — Tue, 17 Dec 2013 23:54:11 GMT

Thank you.

However, it is that I want to ask is that it need a external resistor for safety.

Is there trouble in unconnected unused pins of the default settings?

Jorge_Gonzalez — Wed, 18 Dec 2013 01:08:00 GMT

Hi okubo:

You do not need pullup/pulldown resistor in unused pins. It is recommended to leave them floating and configured as disabled (default).

Hope this clarifies your doubt.

/Jorge Gonzalez