DP83848-EP: DP83848 - Max sink current on LED status pin

Karl Stewart1

Part Number: DP83848-EP

Hi,

I can't find any electrical characteristics specifying the maximum sink current for the LED_LINK, LED_SPEED ad LED_ACT pins.

Can you please advise?

Regards,

Karl

over 4 years ago

0 Aniruddha Khadye over 4 years ago

TI__Mastermind 18425 points

Hi Karl,

Unfortunately, that information is not available at this time. If you need that information to select the correct current limiting resistor for your LEDs, then you can use 110ohms.

-Regards

Aniruddha

0 Karl Stewart1 over 4 years ago in reply to Aniruddha Khadye

Prodigy 140 points

Sorry, I need a little more justification than that I'm afraid.

But let me try to fill in the gaps in that analysis, please correct me if I'm wrong......

Supply voltage will be assumed to be 3.3V.

LED forward bias voltage assumed to be 1.8V.

Current being sunk = V/R = (3.3-1.8) / 110 = 13.6mA

So I'm reading that the pin can sink 13.8mA of current? Is that correct? I'd sill need to know a maximum value though.

0 Aniruddha Khadye over 4 years ago in reply to Karl Stewart1

TI__Mastermind 18425 points

Hi Karl,

Your analysis looks correct but unfortunately this characterization data is not available. So we do not have a max number that we can guarantee in the EC table of the datasheet.

-Regards

Aniruddha

0 Karl Stewart1 over 4 years ago in reply to Aniruddha Khadye

Prodigy 140 points

Okay, fair enough. Thank you for your help.

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DP83848-EP: DP83848 - Max sink current on LED status pin