How to use MP5408 to inform the outside of protection functions?

hideyuki_okada · April 5, 2021, 12:55pm

I am considering using MP5408.
I want to monitor the OVP and OCP protection functions of the MP5408 with an external microcomputer.

Question1
How to inform the external microcomputer of the protection function of MP5408?

Question2
Is there any good way?

Best regard.

Kareem · April 5, 2021, 7:27pm

Hi Hideyuki, this device unfortunately does not have a pin or register interface for reading the error flags.

Perhaps if you could sense the inductor current/output voltages with your MCU’s ADCs you could correlate what you see with the behavior of the MP5408.

hideyuki_okada · April 6, 2021, 4:03am

Thank you very much for your answer.

May I ask add a question?

I got your answer
“Perhaps if you could sense the inductor current/output voltages with your MCU’s ADCs you could correlate what you see with the behavior of the MP5408.”

Question 3
Can you propose a circuit diagram that can achieve this?

Best regard.

Kareem · April 6, 2021, 4:40pm

Something like the diagram below, sensing the output voltage with an on board ADC. You could replicate the behavior with a shunt resistor to get a current measurement as well.