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LMH6586: LMH6586 Shutdown Feature

Abdul Erfan Mohammad28
Prodigy 180 points
Part Number: LMH6586

Dear Team,

We are using LMH6586 for run time switching. All outputs will be in shutdown mode initially and we do switching and then enable the required channel. What we are seeing is that when some input to output combination is selected during the shutdown of that specific output, Output does not come once that channel is taken out of shutdown mode. We need to 1st take that output channel out of shutdown 1st and then give input to output combination. 

This is unexpected as till we create a required combination some junk or previously available input combination plays out. Please provide solution for taking the outputs out of shutdown without giving input to output combination.

Regards,

Erfan

  • 0
    TI__Genius 10552 points

    Hi Erfan,

    For this application its important to note that if an output is in shutdown mode, the input to output connection is lost. To restore the connection, the output must be taken out of shutdown mode and the input to output connection must be re-established.

    This means that you cannot select an input to output combination while the output is in shutdown mode, as the connection will not be preserved. You have to first take the output out of shutdown mode, and then select the input to output combination. This is the expected behavior of the device, not a bug. Are you possibly referring to power down mode? This is different from shut down mode. Per the datasheet, it appears power down mode will preserve registers but not shut down mode. 

    One possible solution to avoid the junk or previously available input combination from playing out is to use the video detection feature of the device. The device can detect the presence or loss of video on any input channel, and report it to the I2C interface. You can use this feature to monitor the activity on the input channels, and only select an input to output combination when there is a valid video signal on the input. You can also use the sync detection feature to detect the loss of sync on any input channel, and use a different sync threshold level for each input. 

    I'm not too familiar with this device as it's one of our less common switches, but the above information is available in the datasheet if you'd like to take a closer look at these topics. 

    I hope this helps! Let me know if you need anything else here. 

    Regards,

    Alex