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OSCIN necessary for RM42 implementation?

Phillip Davis
Prodigy 120 points

Hey guys,

I'm in the process of migrating from the launchpad to a PCB, and I was wondering, since the Hercules does have internal clocks, is it necessary to implement an external clock in the OSCIN pin?
If not, what are the consequences for not having one?

Thanks,
-Phillip

  • 0
    TI__Guru 68920 points

    Phillip,

    The internal clocks are not really accurate - they're there mainly for the purpose of checking for an oscillator failure and for having a backup clock for a 'limp home' mode.

    The PLL doesn't take the low power osc as an input, so you'd be limiting your frequency to around 5-10MHz (see datasheet for actual range it's wider) and you probably won't be able to communicate with the outside world using any sort of asynchronous serial port that relies on a predetermined bit time (like UART or CAN).

    Those are serious limitations IMO but I don't know your application and you'll need to judge.