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Question, input slow signal into GPIO of i.MX28

Question asked by AVNET JAPAN FAE (team share account) on Apr 13, 2015
Latest reply on Apr 16, 2015 by Yongxin Huang

Hi team,


I would like to ask about the input signal to GPIO of i.MX28.

According to i.MX28 datasheet(Table 25 Digital Pin DC Characteristics for GPIO in 3.3-V Mode), GPIO input ports have 0.8V-2V of threshold voltage.

In my customer’s board, some GPIO pins are used for input signals which have slow rise/fall time. For the input signals from external, it takes about 1mSec to cross the threshold range of 0.8-2V.

My customer worries whether such input to GPIO could affect to the reliability of i.MX28.

Are there any problems for that?