7 Replies Latest reply on Nov 19, 2012 11:56 AM by kishore.kumar

Sleep/Wake and ADC, DFB power down?

richard.chaney 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?

user_14586677 Oct 29, 2012 6:25 PM (in response to richard.chaney)

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.
Like Show 0 Likes(0)

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

richard.chaney Oct 30, 2012 1:21 PM (in response to richard.chaney)

Thanks Dana!

I can't find AN66803?



Richard
Like Show 0 Likes(0)

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

user_1377889 Oct 30, 2012 3:44 PM (in response to richard.chaney)

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
Like Show 0 Likes(0)

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

akshay.phatak Oct 30, 2012 11:22 PM (in response to richard.chaney)

You can also try the alternate active mode if waking up from sleep seems to take up a lot of time for your application.
Like Show 0 Likes(0)

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

user_14586677 Oct 31, 2012 8:56 AM (in response to richard.chaney)
AN66803 attached.

Regards, Dana.

AN66083[1].pdf 158.8 K
Like Show 0 Likes(0)

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

sachin.taneja Nov 19, 2012 11:01 AM (in response to richard.chaney)

is there any low power mode in PSoC to save maximum possible power?
Like Show 0 Likes(0)

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

kishore.kumar Nov 19, 2012 11:56 AM (in response to richard.chaney)

@SachinBVP

Are you asking for the lowest power mode in PSOC 3? If so, it is Hibernate mode. Refer to AN77900
Like Show 0 Likes(0)

Actions

Go to original post