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Detail of Oscillator Implementation

Nomo
Guru 16800 points

Hi,

I want to know the detail of Oscillator Implementation which is described in "10.3.1 Oscillator Implementation" of TRM (spnu499).
Could you explain it?
If you can, please show me a schematic.

Because I must check whether this circuit is safety or not and discuss it with my customers, I need concrete information.
If I say it is safety in word, my customers don't accept my word.
And If I can't get the information, the project may stop.

Thanks

Nomoto

  • 0
    TI__Genius 9015 points

    Hello Nomoto,

    I have forwarded your question to the expert on this.  They will be responding soon.

  • 0 in reply to John Hall
    TI__Mastermind 22080 points

    Nomoto-san,

    The key element of the oscillator implementation is shown in the figure. The oscillator relies upon an inversion and in this implementation the inversion is accomplished through an nmos shunt. When OSCIN is high, the shunt is active which discharges the external capacitance (as well as shunts the internal current source). As OSCIN begins to increase, the shunt turns off which allows the internal current source to charge the external capacitance (bringing OSCIN low).

    The safety of the oscillator is shown by continuous monitoring of the oscillator with a clock detect circuit (as described in 10.4.1. Should the oscillator fail, the system will fall back to an internally generated frequency and signal the system regarding the failure.

    I am sorry that we cannot share schematics; if the TRM explanation coupled with the information in this post is not sufficient, please feel free to ask more questions.

    Best Regards,

    Forum Support