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[FAQ] AM6412: unused MMC0_CLK

Bruno B
Expert 1290 points
Part Number: AM6412

Tool/software:

Hi T.I community expert,

1) There is something which is not clear about MMC0_CLK recommandations:

When looking at the datasheet (2024) table 5-80 one can read the following :

==> MMC0_CLK can be left open when not used

But on page 94 there is a note specifying some case where external pull is required: 

The problem is that MMC0_CLK is also described in table 5-1 as being RX : ON after boot without any internal pull inside. This would therefore require an external pull when not used.

Is there something I am missing ?

2) I also have the same kind of question regarding I2C0_SCL which is described as RX : ON after BOOT. However I could not find recommandations about external pull when not used.

Can you confirm ? or not ?

With best regards

Bruno

  • +1
    TI__Guru 62855 points

    The MMC0_CLK pin will be driven low as soon as power is applied, so no concern with the associated input floating.

    Your concern with respect to the I2C0_SCL pin is already addressed in the Connectivity Requirements table. Note: The description for the I2C_SCL connectivity will be updated in the next revision of the datasheet to include the option of pulling the pin high or low, by saying, "Each of these balls must be connected to the corresponding power supply or VSS through separate external pull resistors to ensure the inputs associated with these balls are held to a valid logic high or low level as appropriate for the selected signal function."