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52252 powerfail detection
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52252 powerfail detection
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Hi all,
I'm designing a new low cost application and I need to save some data in a falsh sector when power fails.
I have questions:
- it's ok to use the LVD interrupt to start the flash save procedure? What is the VDD minimum that cause the interrupt (threshold)?
- This interrut can leave me time enough to write a flash sector?
The not so low cost solution is to have an external circuit connected to an IRQ pin that allow me to define the threshold.
Are these available solutions or someone had some different ideas?
Thaks in advvance.
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Hi
This topic is being discussed here:
http://www.utasker.com/forum/index.php?topic=549.0
Maybe that will help you.
Regards
Mark
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I also would be concerned with the supply voltage being so far out of spec when the lvd interrupt occurs to try and get any meaningful work done (even if the supply came back!), much less manipulate flash...
What we have done in the past is set up a resistor divider on the *pre* regulated supply voltage (dividing it to within spec of the a/d converter), and then we can watch as it drops below the regulators drop-out voltage, and thereby get our meaningful work done before the supply voltage is out of spec.
-- Rich
