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DS160PR410: Internal Pull-Up Values on 4-Level Pins

Dallas Pace
Prodigy 130 points
Part Number: DS160PR410


Tool/software:

Various Pins on the DS160PR410 support 4-Level Pin strapping by using either:

1. 1K to Ground [L0]

2. 13K to Ground [L1]

3. Float [L2]

4. 59K to Ground [L3]

These External Resistors work in conjunction with some "Internal" Resistor to provide 4 Different Voltage Levels.

Leakage on these Pins are 10uA at 2.5V. That equates to 250K.

Is this the "Value" of the Internal Pull-Up used internal to the Device?

The Internal Resistor is a Pull-Up and "Not" a Pull-Down, Correct?

The Reason I'm asking this is "What" would happen if I placed an External 1M to "Approximate" the Floating Condition?

  • 0
    TI__Genius 11660 points

    Hi,

    There is an internal PU resistor for the 4-level strap pins.

    Adding a 1M will be seen as an F(Float).

    Regards,

    Undrea

  • 0
    Prodigy 130 points

    I just want to make sure about "Adding" the 1M Externally to the Package. One side of the 1M is going to one of the 4-Level Input Pins and the Other side of the 1M is tied to Ground. In this fashion, I have 1M to Ground on Each Pin. I can then Solder a 59K to Ground in Parallel to the 1M to Ground to achieve L3.

    Again, with 1M to Ground I expect to achieve L2 and when I "Solder" a 59K to Ground in "Parallel" to the 1M to Ground, I will then achieve L3.

    Do I have this correct?

    Can you tell me "What" Value the Internal PU Resistor is inside the DS160PR410?

  • 0 in reply to Dallas Pace
    TI__Mastermind 37193 points

    Hi Dallas,

    Undrea is out of office for a couple weeks, so it will be a bit before he can comment on this.

    Note leakage current is actually 150uA in a pulldown condition.  Since 4-level pins are on internal 2.5V voltage domain, we'd expect pullup resistance to be around 2.5V/150uA = 16.7kOhm.

    Dallas Pace said:

    Again, with 1M to Ground I expect to achieve L2 and when I "Solder" a 59K to Ground in "Parallel" to the 1M to Ground, I will then achieve L3.

    Do I have this correct?

    Yes, this is our expectation.

    Thanks,

    Drew