7 Replies Latest reply on Nov 19, 2012 11:56 AM by userc_38487

Sleep/Wake and ADC, DFB power down?

userc_43812 Nov 19, 2012 11:56 AM

Is it possible to wake from sleep then:

1. Power up the ADC and OpAmps

2. Start a conversion

3. Power up the DFB

4. Pass the ADC sample to the DFB

5. Output the previous DFB result via I2C

6. Go back to sleep

All at 9ksps ?

I have severe power limitations!

Thanks,

Richard

1. Re: Sleep/Wake and ADC, DFB power down?

dakn_263916 Oct 29, 2012 6:25 PM (in response to userc_43812)

You will have to do an analysis of startup times, like clocks (Fast IMO Dtartup Mode),

flushing A/D filters, etc.. This can be done via datasheets, module datasheet, and ap

notes.



Relative ap notes -



AN66803

AN77900



Regards, Dana.
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2. Re: Sleep/Wake and ADC, DFB power down?

userc_43812 Oct 30, 2012 1:21 PM (in response to userc_43812)

Thanks Dana!

I can't find AN66803?



Richard
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3. Re: Sleep/Wake and ADC, DFB power down?

JoMe_264151 Oct 30, 2012 3:44 PM (in response to userc_43812)

Since it will take a couple of ms to wakeup from sleep mode and having all clocks running again at nominal speed, I'm afraid that you will have difficulties to match your required timings.

Bob
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4. Re: Sleep/Wake and ADC, DFB power down?

userc_40307 Oct 30, 2012 11:22 PM (in response to userc_43812)

You can also try the alternate active mode if waking up from sleep seems to take up a lot of time for your application.
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5. Re: Sleep/Wake and ADC, DFB power down?

dakn_263916 Oct 31, 2012 8:56 AM (in response to userc_43812)
AN66803 attached.

Regards, Dana.

AN66083[1].pdf 158.8 K
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6. Re: Sleep/Wake and ADC, DFB power down?

userc_40557 Nov 19, 2012 11:01 AM (in response to userc_43812)

is there any low power mode in PSoC to save maximum possible power?
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7. Re: Sleep/Wake and ADC, DFB power down?

userc_38487 Nov 19, 2012 11:56 AM (in response to userc_43812)

@SachinBVP

Are you asking for the lowest power mode in PSOC 3? If so, it is Hibernate mode. Refer to AN77900
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