3 Replies Latest reply on Jun 4, 2013 3:31 AM by DaKn_263916

Low power mode (DeepSleep) counting time between pulses

userc_7827 Aug 18, 2017 3:50 PM

I need counting time between pulses in a PIO. Without low power requirements I can use a Timer, capture using PIO, and in the interrupt reseting counter for next measure. When I want the fresh data I only need to read the last capture. Meanwhile I can sleep psoc4. I've tested and works good. With Psoc4, Sleep power requirements (about 0,6-0,9mA) aren't good for me, so I'll try using deep sleep. I can use a clock ILO based, and capture in the same way, and read value in the watchdog interrupt, but as I can read in datasheet, using DeepSleep the Timer interrupt doesn't get fired (only WDT, so I can't reset counter). I have also doubt the Timer module can work in DeepSleep mode. Also ILO precission isn't good (About 60%, 10% with Trim module). Is there better way for doing this in DeepSleep mode? Can I reduce from 0,6mA power consumption in Sleep mode?

1. Re: Low power mode (DeepSleep) counting time between pulses

DaKn_263916 Jun 4, 2013 3:28 AM (in response to userc_7827)

The ILO is very wide tolerance. A way around this would be a production test/cal routine,

where a known accurate source is fed to PSOC 4, it measures, and computes a G factor to

correct readings. But then to do that right one would have to sweep locus of T and V to have

complete correction, probably impractical. Maybe a first order correction might suffice, you would

have to work the numbers.



The TRM pretty much confirms what can be used as wakeup sources -
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2. Re: Low power mode (DeepSleep) counting time between pulses

DaKn_263916 Jun 4, 2013 3:30 AM (in response to userc_7827)
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3. Re: Low power mode (DeepSleep) counting time between pulses

DaKn_263916 Jun 4, 2013 3:31 AM (in response to userc_7827)
Wakeup sources, attached.

PSOC 4 Wakeup Sources.png 77.2 K
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