Simonas L.

i.MX53 user buttons trigger when touched and board ungrounded

Discussion created by Simonas L. on Feb 19, 2012
Latest reply on Jun 12, 2012 by Bhavana Bhavana

Dear all,


When I operate i.MX53 stand-alone -- only with LCD via touch-screen, have only power supply  connected and no other peripherals attached, -- boards suffers from poor grounding, by exposing hectic USER1+2 button activity:

Whenever I touch any of those buttons (no press-action involved), it starts sending pressed events at an extremely fast rate (potentially halting the running OS).

Whenever I attach a well-grounded cable (USB/µUSB, serial, VGA), this behaviour goes away.

The board is intended to be used as stand-alone, without any wires supplied and no possibility to ground it - how could the button behaviour be fixed? Soldering a capacitor did not help (it then nearly completely disabled buttons sending any action when pressed)


Many thanks,