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Ultra-low PWM? :)

kazola
Guru 18595 points

Hi,

this is my first post in "Clocks & timers" !

I'm searching for something similar to the TS3001 from Touchstone, which is a 1v/1uA timer.

What I want to do is a PWM with very low duty-cycle, around 50us per second, which I think it is 0.005% :)

Obviously this should consume as low as possible. I've tried to do this with the peripheral function in MSP430 but the current consumption is around 40uA :)

Do TI can provide a solution for me? Does anybody have an alternative idea? Let me know!

  • 0
    TI__Mastermind 28550 points

    Hello Kazola,

    I don't know of any such timer chip from TI meeting such requirements.

    It appears you are still searching because TS3001 doesn't support your very low duty cycle (0.005%) or your very low frequency (I calculate 1 Hz).  You may be forced to MSP430 to provide the functionality you desire at the expense of very low power.

    Not sure your tolerances on your signals over temperature/voltage for attempting a discrete solution.  But again, my best recommendation would be MSP430.

    73,

    Timothy

  • 0 in reply to Timothy T
    Guru 18595 points

    Hey Timothy! :)

    You are absolutely right, thanks for answering! :) I've tried with MSP430 but the minimum power consumption I've obtained is 40ua with peripheral operation? Do you think doing it in a simpler manner with a timer interruption giving an output will low this value? Do you have a code which may help me out? :) Let me know, I will continue my tests by the moment :)

  • 0 in reply to kazola
    TI__Mastermind 28550 points

    Hello Kazola,

    I know to minimize power consumption often it makes sense to power down the microcontroller for even small amounts of time.  I'm not very familiar with the MSP430, but to achieve your 1 Hz with low duty cycle signal, perhaps you can power down the MSP430 for 950 ms with the output low, then wake-up to toggle the output high for a brief amount of time.  Maybe this will make the MSP430 a better option for you.  This way most of the time the MSP430 is powered down!  I'm afraid I'm not sure what the state of the output will be in this case or how much control you have during power down.

    I'm afraid I don't have any such example code, however you may try posting the question in the MSP430 forum.

    73,

    Timothy

  • 0 in reply to Timothy T
    Guru 18595 points

    Yeah, sure, I agree with you. I have already done that type of code. If anybody needs it, just message me.

    Thank you for your answer Tim!

    Bye!