Best Way to Create Power Up Pulse Generator to Wake Up MCU

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Best Way to Create Power Up Pulse Generator to Wake Up MCU

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Byar
Contributor I
I was wondering what some of the common ways is to create a power up pulse to wake up a MCU in stop mode? Most of the voltage supervisor and monitors assert a reset anytime the VCC/monitor voltage of the supervisor falls. This has the effect of waking the MCU up but not letting the program run which increases the current draw from a battery backup.

Thanks,
Lucas
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Wings
Contributor I
It sounds to me like you're looking for some external very low power hardware to generate a wake-up signal. A while back I used a DS2417 timekeeper chip for this. It draws almost zero power and as an added benefit gives you an accurate time base. You get a wakeup signal every second, crystal controlled.
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bigmac
Specialist III
Hello Lucas,
 
Have a look at the operation of the KBI module in the datasheet for the MCU type you are using.  See if this will meet your requirements.
 
Regards,
Mac
 
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