LPC54018 custom board pin interrupt issue

Renuga_AKAS — Mon, 31 Oct 2022 05:23:50 GMT

Hi,

We're using Customized LPC54018 - 208 PIN board for our project, here we're facing a issue in Pin interrupt. We import an SDK example for Pin interrupt, Only pin interrupt 0 (Port 0 - 5th PIN) & 1 are configured (Port 1 - 9th PIN). Separate switches given to the PINs and the switch individually pulldown to ground. Whenever, I pressed the first switch (Port0 - 5th PIN), i also see a change (low to high) in Port 1 - 9th pin also in CRO. What's the sensitivity of the PIN? Can you suggest us a solution to overcome this?

Here I have attached the Images for your reference.

Re: LPC54018 custom board pin interrupt issue

xiangjun_rong — Mon, 31 Oct 2022 06:51:52 GMT

Hi,

I suppose that the pull-up resistor is too small, when you press the button, the pull-up resistor flows a large current, which causes the power supply voltage decreases.

As the above pic, the pull-up resistor is 100K ohm, pls have a try.

Hope it can help you

XiangJun Rong

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LPC54018 custom board pin interrupt issue

Re: LPC54018 custom board pin interrupt issue