Max current sink on iMXRT1021 GPIO pins

[chriscowdery]

Hi All,

 I need to know the maximum current you can 'sink' through the GPIO pins on the iMXRT1021.

It is not in any of the datasheets.

I need to know per-pin and total currents.

(We have a group of LED's which are powered directly from an LDO, and grounded via the Processor. We need to check that the LED current does not exceed the pin rating, and that if we have all four LED's on, we don't exceed the part rating).

Thanks,

Chris.

[chriscowdery]

Thankyou victorjimenez‌. Perfect answer.

Chris.

[victorjimenez · Accepted solution]

Hello Chris, 

If I understood correctly, you are using negative logic. The LED's are grounded via the i.MXRT, this means that the current is being supplied by your source power. This type of connection is the same we use on the i.MXRT1020-EVK, since is the best option because you are not demanding any current to the i.MXRT. So, you don't have anything to worry about in your design.

Have a great day,
TIC

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