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DP83822IF: Internal pull resistors

Bernhard Boehmer
Expert 1240 points

Part Number: DP83822IF

Hello TI,

1) In snls505g there are discrepancies between Tables 6-1 and 6-2 concerning the state of the internal pull resistors, e.g. nRESET in Table 6-1 has PU but none in Table 6-2.

Is the intention perhaps that Table 6-2 shows the pull resistor state during nReset and Table 6-1 after nReset? For instance, that the nReset pin has no pull resistor during power-up or during software reset or while the nReset pin is held low, however, once out of reset, there is a pull-up on that pin?

image.png

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The are other pins with similar differences.

 

2) Can the part be held in nReset indefinitely and without causing undue power consumption?

  • +1
    TI__Mastermind 35705 points

    Hi Bernhard,

    1. The RESET_N pin will have an internal pullup while the PHY is powered on. This is true for both the normal and reset states. In table 6-2 RESET_N is left blank because the RESET_N signal is assumed to be pulled low by an external factor (hence causing the reset condition). 

    Bernhard Boehmer said:
    Is the intention perhaps that Table 6-2 shows the pull resistor state during nReset and Table 6-1 after nReset?
    • This is true for all other pins in Table 6-2. This table shows the state of pins during reset, while 6-1 shows the state of pins during normal operation (after reset).

    2. There is no maximum limit on RESET so yes DP83822 can be held in RESET indefinitely. Power consumption should stay relatively constant in this state.

    Best,

    Shane