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Korken

Member Since: December 23, 2006

Country: United States

  • Yes, but the resistor should be in series with the supercap as in the datasheet, not with the pin as well. To be on the safe side. If the internal resistance i high enough it might still work, but being on the safe side is usually better.

  • It seems you have designed the part with the SuperCap wrong.

    Look at the datasheet on page 12. It shows you should have the resistor in series with the battery/supercap only, not from the diode to VBAT. This will cause the a 45s delay until VBAT is above 1.5V and the chip can function properly.

  • Are SparkFun going to sell these ICs separate soon? I’d really like to have this guy in a project but needs it on my own board. Or is there another supplier?

  • I’d like to tell of an error in the PCB design.
    The datasheet specifies:

    “Selecting a Clock Crystal

    Choose a 27MHz parallel resonant, fundamental mode
    crystal. No external load capacitors are needed. All
    capacitors required for the Pierce oscillator are includ-
    ed on-chip.“
    Yet you have included the capacitors. Why have you done so?

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