Is it possible to detect when the supply power drop to a specified level on ADuCM360-Eval board?
You could use an external reference and measure avdd and iovdd, or if you could use avdd as the reference and measure a known signal, and from that you can calculate what AVDD is.
Your known signal can be anything, let's say a sensor that doesn't change very fast.
You measure that sensor using the internal reference, you calculate it's voltage, and the you remeasure it again using AVDD as the reference and you can work out what AVDD is
Now I want to do a brown out check before executing any command. So I need use ADC to do that? Is there any default register for me to check if the power is dropped down to a specified level?
There is no power supply monitor to warn you of low power.
RSTSTA can be checked to see if a POR reset occured, but that will only tell you that you had power issues after instead of before your chip resets.
Could you use an external comparator to monitor the power supply and trigger an interrupt if the level goes below a set voltage?
I'm not 100% sure on what you're trying to do? Why can't you use the ADC?
Thank you. I just want to make sure I can use ADC to monitor the power. In that case, I would do that.
Yes you can monitor power with the ADC.
When the power gets too low for the part to function, you will get a POR and your code will stop running until power returns to acceptable levels. you will know this has happened by checking RSTSTA.
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