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Embedded battery device guaranteed reset advice

Hoyt A. Stearns Jr.
Intellectual 310 points
Other Parts Discussed in Thread: MSP430FR5969

Advice requested on the necessity of a hardware MCUpower down circuit in case the watchdog timer doesn't work.

We must be able to guarantee that our battery powered embedded device can be reset and shut down in all cases in case of a crash

(similar to the way an iPhone can be reset by holding the power button for a while.).

Do you think that can be guaranteed to happen using the MSP430FR5969 internal circuitry reliably?

We could add a separate power down IC if needed, but if the MCU is reliable enough, maybe that's not

necessary.

  • 0
    Guru 227245 points

    Hoyt A. Stearns Jr. said:
    Do you think that can be guaranteed to happen using the MSP430FR5969 internal circuitry reliably?

    It can be done by a power switch :)

    Causing a reset can be done with a pullup resistor on RST, a large pulldown capacitor on RTS and a slightly stronger resistor to the pulldown button. So if you press the button, this will start to discharge the capacitor on RTS, finally resetting the MSP.
    However, as soon as you release the button, the MSP will start up again. To keep it off, you have to deactivate the supply by a similar mechanism. Or make the MSP detect that it was shut down this way and go into off state by itself.

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