DP83822I: About LED indicator

Y.Ottey

Part Number: DP83822I
Other Parts Discussed in Thread: TLK110

Dear all,

I would like to ask a question about LED_1 pin in DP83822I.

Our customers are considering replacing TLK110 with DP83822I.
At that time, the data speed (100M or 10M) that has been confirmed by the LED connected to the LED_SPEED pin of the TLK110 is to be confirmed by the LED connected to the LED_1 pin of the DP83822I.

If you check the data sheet, I think that you can check the data speed in the same way as the LED_SPEED of TLK110 by connecting as shown in the figure below.

Is the above idea correct?

(In TLK110, the LED and the resistor were connected by pull-up, but in DP83822I, there is a notation to connect each by pull-down, so our customers are worried that they can be used in the same way.)
If you need other settings, please let me know.

Best Regards,

Y.Ottey

over 4 years ago

0 Cecilia Reyes over 4 years ago

TI__Genius 9920 points

Hi,

Please review the schematic in our DP83822 EVM User's Guide. The LEDs for the speed can be set as pull up or pull down. http://www.ti.com/lit/ug/snlu179/snlu179.pdf

Thanks,

Cecilia

0 Y.Ottey over 4 years ago in reply to Cecilia Reyes

Mastermind 6145 points

Dear Cecelia

Thank you for your reply.

In Table 1 of the data sheet, IOstate is described as PD / HiZ state during reset.

In this case, is it OK to connect LED_1 by pull-up as shown in the figure below?

I would like to tell you the reason if possible.

Best Regards,

Y.Ottey

0 Cecilia Reyes over 4 years ago in reply to Y.Ottey

TI__Genius 9920 points

Hello,

Yes, LED_1 can be configured as an active high or active low. So you are able to connect it like the figure shown in the image. It is internally pull down during normal operation so it can be figured either way.

Thanks,

Cecilia

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DP83822I: About LED indicator