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Original question:

DP83867IR: LED pin current

DP83867IR: Separate Link/Activity led for 10/100 and 1000

Kimmo Lindholm
Intellectual 271 points
Part Number: DP83867IR


Tool/software:

Just to confirm my idea.
I need two leds, one to show 10/100 link/activity-blink, and another to show 1000 link/activity-blink.

Such configuration is not directly available, but could be achieved by combining three leds to two:
(Strappings omitted for clarity)

Requires following configuration for led pins and polarities:

LED_0 = 0101: 1000BT link established - Active high
LED_1 = 1000: 10/100BT link established - Active high
LED_2 = 1011: Link established, blink for transmit or receive activity - Active low

Could this work?

  • +1
    TI__Expert 6685 points

    Hi, 

    This is a rather creative application, not the typical application we would see for the LED pins. That being said, this configuration should work. I can see that in the case all 3 LEDs are inactive, the LED2 would be driven high while LED0 and LED1 are driver low. In this configuration, the LEDs shouldn't turn on since the voltage polarity is reversed w.r.t the LEDs. In the case where a link is established, LED2 would be driven low while one of the 2 LED0/LED1 would be driven high activating that particular LED. 

    Best,

    Vivaan

  • 0 in reply to Vivaan Jaiswal
    Intellectual 271 points

    Ok, thanks.
    Need to test it when i get to prototyping phase...