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DP83867IS: LED pins

May
Genius 9880 points
Part Number: DP83867IS

Hi Team,

We received a query from customer asking the operation of the LED pins of the device.

1. In the datasheet, 1.8V I/O VDD supply, it mentions that the LED may be dim when operating at this voltage. Does it mean the driving voltage of LED pins is dictated by voltage in the applied in VDDIO?.

2. What are the max source/sink current of these LED pins?

Thank you and looking forward for your kind response.

Regards,

Maynard

  • 0
    TI__Genius 16030 points

    Hello Maynard,

    1. Yes VDDIO level dictates the applied voltage.

    2. For approximation you may assume LED pin to be ~70ohms impedance connected between VDDIO and pin. Using this you may calculate voltage at LED pin vs current taken out from this pin.

    --

    Regards,

    Vikram 

  • 0 in reply to Vikram Sharma
    TI__Genius 9880 points

    Hi Vikram , 

    Just a followup question, you mention "taken out" at this link in #2, does this mean the pin can only a source current or can it act as a sink instead?.

    Thank you and looking forward for your kind response.

    Regards,

    Maynard

  • 0 in reply to May
    TI__Genius 16030 points

    Hello Maynard,

    When pin is driving high voltage, it will source the current. You may think of it as an equivalent of ~70ohms resistor connected to VDDIO in this situation.

    When pin is driving low voltage, it will source the current. You may think of it as an equivalent of ~70ohms resistor connected to VDDIO in this situation.

    --

    Regards,

    Vikram