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PCA9306 VREF voltages.

Rajendra Shenoy
Intellectual 480 points
Other Parts Discussed in Thread: PCA9306, PCA9515, TCA9517

Hi,

 

Can I use PCA9306 as buffer without level translation? i.e. VREF1 = VREF2 = 1.8V?

 

I have read "The applied voltages at VREF1 and VDPU should be such that  VREF2 is at least 1 V higher than VREF1 for best  translator operation".

 

Thanks And Regards,

Shenoy

 

 

  • 0
    TI__Intellectual 1930 points

    Shenay,

    the PCA9306 is not a buffer type level translator... it only translates signal level without buffering the signal. Therefore it would be pointless to use it with Vref1 = Verf2.

    You can use the PCA9515 if you want to use a buffer without level translation.

    Regards,
    Akhil.

  • 0 in reply to Akhil Nair
    Prodigy 95 points

    in our application we need to translate between a programmable voltage (1.8v or 3.3V) to a fixed voltage (1.8V). in this case we can be in the condition where the two sides have the same voltage. will this work? data sheet seems to suggest that vref2 should be always 0.6V higher than vref1...

    thanks,

    Dario

  • 0 in reply to Dario Pennisi
    TI__Mastermind 30260 points

    Dario,

    If you are referring to the PCA9306, it only performs voltage translation and VREF2 must be at least 0.6 V higher than VREF1, as Akhil mentioned above.

    I recommend using the TCA9517 if both supply voltages can be equal to 1.8 V