Hi,
I am looking at using a Cortex M3 based mcu for an application requiring a very fast wakeup time and low power during that sleep mode.
Is it possible for the M3 to wake up in less than 300us given that whatever sleep mode it is in has to draw less than 300uA?
thanks,
Mike.
Yes, it is. SMT32 series has 2 power down modes. In STANDBY mode in consumes 2uA (typ.) and wakes up in less than 2uS. In STOP mode in consumes 14uA (typ.) and wakes up in less than 40uS.
Regards, ~ Ale?
Actually it is STM32, not SMT32. You can find more info about low-power modes of this series on ST web site. Look for application note AN2629.
~ Ale?
I believe STM is releasing a low power version (STM32L) next year with STOP/STANDBY at 2/1uA , respectively.
That seems very odd. On all other processors I've used, the lower the power consumption for a mode, the longer the wakeup time. In this case it seems to be the opposite.
You'd have to be nuts to use STOP mode, since it's both 7X higher power and takes 10X longer to wake up.
It's easy to remember: STM32 is ST's M32 uC.
With regulator off in standby mode, you might not be able to preserve I/O states. Just my guess for now, I have to study it further.
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you are right, he has the times reversed, stop keeps RAM active
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