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LPC540: Voltage at ADC input before VDD

Question asked by Jana Beck on May 6, 2020
Latest reply on May 8, 2020 by Omar Anguiano

Hi,
I have a design, where I am trying to measure voltages with a LPC54016.
One ADC input is a voltage, that will be on an ADC pin, before the MCU gets powered.

 

I have VCC_5V that gets converted into VCC_3V3 with a step down DCDC converter.
I have 5V going to an ADC input (with a voltage divider, so it is 2.25V at the pin).
That means, that the 2.25V will be on the ADC pin before 3.3V at the power supply pins.

Can this damage the MCU?

Thanks,
Jana

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