Dear Support Team，
Based on NCS 1.9.1, compile and download Hello Word firmware to nRF5340-DK (1.0.0), measure the voltage of all IOs with a multimeter as shown below:
Please answer three questions:
1. Where are the default high and low levels set, for example, why is p0.20 3v?
2. How is the 1.5v voltage generated?
3. Why is the voltage of so many io ports 0.1v instead of 0v?
Hi,
1. Where are the default high and low levels set, for example, why is p0.20 3v?
You can read about this from our power options documentation. Is this mentioned pin the one that you are checking?
2. How is the 1.5v voltage generated?
The 1.5V can be seen on the pins where the LEDs are connected. Do your LEDs light up? Maybe the default pin state is high, so when the pins are high, no LEDs glow and when they are pulled down, they light up.
3. Why is the voltage of so many io ports 0.1v instead of 0v?
Do you see 0.1V or 1mV?
Best Regards,
Priyanka
Hi,
1. Where are the default high and low levels set, for example, why is p0.20 3v?
You can read about this from our power options documentation. Is this mentioned pin the one that you are checking?
2. How is the 1.5v voltage generated?
The 1.5V can be seen on the pins where the LEDs are connected. Do your LEDs light up? Maybe the default pin state is high, so when the pins are high, no LEDs glow and when they are pulled down, they light up.
3. Why is the voltage of so many io ports 0.1v instead of 0v?
Do you see 0.1V or 1mV?
Best Regards,
Priyanka
