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Current consumption on CC8520 in low-power mode

Vladimir Tetelbaum
Intellectual 280 points

What is the expected current consumption in power down state?  Datasheet has it at 1A -- I assume it is a type and should be 1uA.  Please confirm.

We see more like 110uA and are looking for the leak.  The latest FW release has the following known issue:

[FW] The MOSI pin should be held high during power-down to avoid current leakage through the internal pull-up resistor

How much current leakage goes through this pull-up?  How about any other pull-ups?

 

Any other places where we might have a leak?

 

Thanks,

Vlad

  • 0
    Guru 31280 points

    Hi Vlad,

     

    The power consumption is really should be 1uA, it is wriiten in datasheet Rev. D,

    "ELECTRICAL CHARACTERISTICS" table (probably a typo in an early version of this document).

     

    By searching the document, I haven't find any reference to a value of SPI pull-up resistor, or any other

    pull-ups.

    At least to measure (and eliminate) the current draw from a MOSI pin, you can configure this pin to low

    and then high, and see what is the value of this specific pull up...

  • 0 in reply to Igor Sherer
    Intellectual 280 points

    Yes, all the extra current leakage was due to MOSI pin.  Once it is handled correctly, the consumption drops below 1uA -- Incredible.  Good job guys.

    Also, the data sheet is correct.  But if you are viewing PDFs on a Mac Previewer, the "micro" symbol does not come through.