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TPS65094: Description of DECAY_BIT

Marion Loessl
Expert 3675 points
Part Number: TPS65094

Hi!

my customer uses this device and notices, that the CPU often times access the BIT DECAY (BIT0) and sets and deletes it.

Why is that?

And what is this register for?

Kind regards,

Marion

  • 0
    TI__Mastermind 30310 points

    Marion,

    I'm sorry, but I don't see "BIT DECAY" or "DECAY_BIT" or any meaningful combination of these 2 words anywhere in the TPS65094 datasheet.

    Can you be more specific about the register you are referring to? Do you know what the I2C Address is? Are you using an I2C Analyzer (like the Saleae or TotalPhase Beagle) that will allow you to print a datalog?

    It is possible the naming conventions used by Intel are different than those in the TI datasheet, but I do not have any way to map the Intel CPU command to the PMIC Registers.

  • 0 in reply to Brian Berner
    TI__Mastermind 30310 points

    Marion,

    I have learned that this bit is a bit in the BUCK1CTRL register (address 20h).

    This is a RESERVED bit, but its original name was BUCK1_ DECAY and it is a R/W bit. The definition is as follows:

    Decay Bit

    0: The output slews down to a lower voltage set by the VID bits.

    1: The output decays down to a lower voltage set by the VID bits. Decay rate depends on total capacitance and load present at the output.

    Since this bit is RESERVED, we advise that you do not modify any code which accesses this bit. However, it is not an issue if Intel code is modifying this bit. Intel was informed of the original name and definition of this bit.