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DP83TG720R-Q1: Fail to enter into sleep mode

Shubiao Wang
Intellectual 1490 points
Part Number: DP83TG720R-Q1

Hi there,

I use dp83tg720rq1 in master mode.I want to enter into sleep mode as 

I follow the normal to sleep steps as  below.

however, the INH pin never goes low to disable the power rails.

please help to analyze why it fails to pull low INH?


BRs

Shubiao

  • 0
    TI__Mastermind 26752 points

    Hi Shubiao,

    Do you have the 10kohm pulldown resistor on the INH pin? Also, since register 0x018B is an extended register, are you using the procedure described in section 8.4.11 of the datasheet.

    If both of these answers are yes, please try removing the cable from the device and sending the sleep command again.

    Thanks,

    David

  • 0 in reply to David Creger
    TI__Intellectual 1490 points

    Hello David，

    The both answers are YES.

    When the cable is removed, it goes to sleep mode successfully.

    You know, Removing cable is unrealistic.

    please let me understand why removing cable works?

    how to make it go to sleep mode properly without removing cable?

    BRs

    Shubiao 

  • 0 in reply to Shubiao Wang
    TI__Mastermind 26752 points

    Hi Shubiao,

    If this is the case, there must be signaling on the line coming from the far end that is waking the DP83TG720 up. Check with the link partner, as the line must be silent for the device to go to sleep. 

    Thanks,

    David