LS1021A GPIO

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LS1021A GPIO

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damonmeng
Contributor II

I think GPIO might have weak pull-up or drop-down by default, how to disable, we need pure signal.
We test on the customer board if the direction is set to input, but at this time already register the value on the pin, and the value is to take certain ability to drive,
Is this?

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alexander_yakov
NXP TechSupport
NXP TechSupport

There is no weak pull-up or pull-down resistors on GPIO pins.

Have a great day,
Alexander
TIC

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damonmeng
Contributor II

But we test the GPIO(GPIO3_16) is pull up or pull down.Can you test it?

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alexander_yakov
NXP TechSupport
NXP TechSupport

Design team confirmed - there are no internal pull-up or pull-down resistors. When multiplexing is selected for GPIO and GPIO is in input mode, the chip is not driving anything. If you see anything driven on the pin in this case, than there must be something other connected to this pin on the board, which is causing this abnormal behavior.


Have a great day,
Alexander
TIC

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