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DP83822I: LED_1 pin connection

Taketo Sato
Genius 10355 points
Part Number: DP83822I
Other Parts Discussed in Thread: DP83867IR

Hello team,

I would like to confirm DP83822I LED_0 pin, LED_1 pin connection.

I would like to drive a LED using a transistor like DP83867IR datasheet figure 27 does(below).

VDDIO of DP83822 is 2.5V this time, so a transistor drive is normally not needed. However, LED will be placed on different board so I would like to use a transistor to drive the LED.

  • Is this connection ok for also DP83822I?

DP83822I datasheet says that LED_0 pin and LED_1 pin require parallel pull-up/down resistor.

  • In case LED_1 pin is connected to base of a transistor, do we still need a parallel resistor?

LED_1 pin's bootstrap setting seems to be limited only to Mode1 and Mode4, so I would like to confirm if we can remove the parallel resistor(or boot strap resistor) in case the pin is connected to transistor's base.

Best regards,

  • +1
    TI__Guru**** 196829 points

    Hello Taketo Sato,

    Thank you for the message 

    A Pull down resistor in recommended in your application case. Please see below 

    Note: LED_0 and LED_1 require parallel pullup or pulldown resistors when using the pin in conjunction with an LED and current limiting resistor. A 1.96kΩ to 2.49kΩ resistor should be used as the parallel pull resistor.

    Regards,

    Sreenivasa