action depending on battery voltage

[Suthan2491]

Hi All,

Our Application is battery-based. Mainly we use a cross-over processor—some issues we facing in power supply.
1) In the processor some power blocks minimum voltage of 3V.
2) But our battery will go below 3V, so the processor will go into some hang state.

Before the processor if 3V above then only need to allow power for the processor. Could you please help only one?

After voltage voltage then only need to allow supply to all sections.

[Moderator action]

Removed unnecessary 'Urgent' tag on title​

 

[danadakk]

Use super caps to keep processor running for some fixed time ?

Can you put processor in sleep state when brownout detected ?

What length of time do you need to keep processor running and what is needed current ?

What processor is it, part number ?

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Regards, Dana.

 

[Suthan2491]

Thanks for your response

Please check the attached image

In Battery Condition
If Vout > 3V Need to supply a processor
If Vout < 3V Not enter supply processor

 

[danadakk]

Current draw when supplying processor ?

Again :

Can you put processor in sleep state when brownout detected ?

What processor is it, part number ?

Knight

 

[D.A.(Tony)Stewart]

Show links to uC and battery to show operating conditions.

 

[crutschow]

So do you just want to remove the power from the processor when it drops below 3V?
If so, a TL431 programmable reference, configured as a comparator to drive a high-side MOSFET switch would work.

 

[D.A.(Tony)Stewart]

If you have 5V then you have a different problem than the 3V one you stated.
More details are necessary to expand your options and make a better design.

 

[KlausST]

If so, a TL431 programmable reference, configured as a comparator to drive a high-side MOSFET switch would work.

I´d add a hysteresis, else one can expect some kind of ON/OFF oscillation.

Klaus

 

[D.A.(Tony)Stewart]

If the uC has a low voltage sensor , perhaps you can perform a loop to wait for a reset or OK signal while doing NOops.