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LMH1297: Re-enable through programming when Enable pin is low

Ron Proesel66
Prodigy 30 points
Part Number: LMH1297

I inadvertently grounded the Enable pin on my LMH1297 design which disables the chip.  Is there a way to re-enable it through the SMBus? I seem to be able to read registers so it seems to be responding.

Thanks

  • 0
    TI__Guru* 93670 points
    HI Ron,

    When you in register access mode, you can setup the device in either EQ or cable driver mode to enable the device in either mode.

    Regards,,nasser
  • 0 in reply to Nasser Mohammadi
    Prodigy 30 points
    I have programmed the chip in EQ mode as described in 3.1.1 of the programming guide and verified that the registers were properly set by reading the contents. The chip still does not respond to an input signal. The data sheet indicates that the enable (pin 32) performs a power-down. I don't have a LHM1297 evaluation board, but I see that J5 provides a way to disable the chip in the same way that I accidentally wired it. Could you check if you can make it work properly when disabled? Perhaps there is a bit somewhere that needs to be flipped that I am not doing. Thanks.
  • 0 in reply to Ron Proesel66
    TI__Guru* 93670 points

    Hi Ron,

    I just checked this on my LMH1297EVM.

    To disable power save mode by ENABLE pin, please set Config_IO reg 0x00[5] = 1'b

    Regards,,nasser