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About a method when not using /CS of TLC2543.

Satoshi
Guru 19575 points
Other Parts Discussed in Thread: TLC2543

When not using /CS of TLC2543, is it necessary to make GND connection?
Since No Connect will be in a floating state, can't it be recommended?

Thank you for your consideration.

Satoshi

  • 0
    TI__Expert 5705 points

    Hi Satoshi,

    For predictable chip operation, it is always a good idea to maintain the digital inputs in a known state; floating them is not recommended. When the /CS pin is not being used pulling it up to logic "1" (>3V) would be best.

    Thanks,

    Harsha

  • 0 in reply to Harsha Munikoti
    TI__Expert 5705 points

    Hi Satoshi,

    I re-read your post and I believe I may have misinterpreted your question. Here is a timing diagram from the TLC2543 datasheet that applies to the case where /CS is not being used:

    Basically, the timing diagram shows /CS transitioning from high to low, and from that point on /CS remains low because, according to the datasheet, driving /CS high disables serial data transfer. So with /CS high you will not be able to send or receive data from the ADC. To be safe I would recommend replicating the timing diagram above exactly if possible. I hope this helps.

    Thanks,

    Harsha