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ADP5588 and multiple keypress / stuck key detection

Question asked by gdownes on May 3, 2015
Latest reply on May 4, 2015 by RSchnell

Hello,

 

I am wondering if anyone has more information regarding what the ADP5588 io port expander / keypad matrix device will do in the event of a stuck key (single or multiple).

 

The datasheet says:

 

"When one key press or multiple key presses (short between coumn and row) occur, the internal state machine checks the row pins to determine which one is driven low and then triggers an interrupt."

 

How does the device respond if there are say, 3 keys stuck, the internal construction diagram does not show any in-line diodes so I am unsure just how resiliant the device is to ghosting or any sort of faults present on the keypad matrix.

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