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ADS1241: BUFEN

Part Number: ADS1241

Can I leave the BUFEN pin as floating and only use the BUFEN bit in ACR register.

  • Hi Akash,

    you should never leave digital inputs floating on an IC - unless the device provides some internal pull-up or -down resistors.
    If you want to control the buffer using the BUFEN bit then you should tie the BUFEN pin high.

    Regards,

  • Hi Joachim,

    How will I confirm that the the buffer is enabled or disabled when the BUFEN pin is set high and the BUFEN pin is set low.

    Further the lines in the datasheet says:

    "The buffer can be enabled using the BUFEN pin or the BUFEN bit in the ACR register. The buffer is on when the BUFEN pin is high and the BUFEN bit is set to one. If the BUFEN pin is low, the buffer is disabled. If the BUFEN bit is set to zero, the buffer is also disabled ".

    It is not clear in these lines.

    Regards,

    Akash Kasturi

  • Hi Akash,

    Both the BUFEN pin and BUFEN bit must be high to enable the buffer.  So if you want to control the buffer enable from the register bit, you must set the BUFEN pin high as well.

    BUFEN pin     BUFEN bit     Buffer

    0                   0             Disabled

    0                   1             Disabled

    1                   0             Disabled

    1                   1             Enabled

    So you can control from either the pin or the register bit, but to satisfy the truth table both the register and pin must be properly set.

    Best regards,

    Bob B