What is the difference of GPIO structure on Silicon Labs MCU families.
5V tolerance of GPIO pins on Silicon Labs MCU families as followsType A:
Pins are tolerant of the IO power supply voltage plus 2.5V, so they are 5V tolerant with a 3.3V supply. When the pin voltage rises more than 2V above the supply, the leakage currents from the pin to the supply and from the pin to ground will increase with voltage. When the power supply is 0V, the applied pin voltage can be as high as 3.3V at room temperature with moderate leakage; but at that voltage, the leakage can be very high at elevated temperature.
Devices: EFM8UB1, C8051F86x. etc
Pins cannot exceed the IO power supply voltage, which can be up to 5V. The pin includes an ESD protection diode to the power supply, so the pin leakage will increase exponentially if the pin voltage exceeds the power supply voltage by more than 0.5V at room temperature. These pins are 5V tolerant only if the IO supply is 5V..
How can one tell which type of GPIO structure any given MCU has?
For example C8051F962 which is not listed above