Operating Voltage 3.3V (5V tolerant I/O)


it is written that the Operating Voltage is 3.3V (5V tolerant I/O). What does 5V tolerant I/O exactly mean? Can I connect a sensor output of 5V to an input of the arduino 101? Can I generate a 5V PWM signal?

Thanks in advance for the answer.


Haven't checked it, but to me "3.3V but 5V tolerant" means

Output I/Os output 3.3V as a high.
Input I/Os work at 3.3V logic levels but will survive (tolerate) interfacing with a device that outputs 5V as logic high.
Analog inputs will see 3.3V as full scale (1023) - you can apply up to 5V without damaging anything, but you cannot measure beyond 3.3V (without adding some voltage divider circuit or other scaling).

I guess a comparison many people would be familiar with is the Raspberry Pi GPIOs - these are 3.3V only. They are NOT 5V tolerant - connecting them directly to 5V risks damage to the RPI.

Ok. Thanks :slight_smile: