Nicla Voice Pin SDA SCL Voltage ?

Official Hardware Nicla Family Nicla Voice
1

Hi all,
I not undestood if SDA and SCL pin nicla voice needs 3.3 or 5v.
Then if I need a level shifter where can I take the reference voltage + for the shifter from Nicla? I dont see
a +3v3 pin and
the pin 7 VDDIO_EXT are 0V
the pin VIN_BQ25120 are 4.8V

Thanks in advance

Paolo

2

I would help if you posted links to the technical information on the parts we are talking about, there are many with the same or similar descriptions.

3

nicla-voice-pinout
nicla-voice-pinout2807×2082 82.9 KB

Hi gilshultz,
this is the pinout diagram of Nicla Voice, I want to connect it to an Arduino Uno via I2C.
I know the Arduino sends 5V on its port and I don't know if Nicla Voice does the same on the pin 1 and 2 (SCL-SDA).
I think like all recent devices it uses 3v3 and so I need to connect a level shifter, the level shifter needs a low voltage reference and a high voltage reference, for the high voltage I can use the Arduino's 5V but for the low voltage I don't know where to get it because pin 7 on the Nicla is 0V and pin 9 is 4v8 so I don't have 3v3 as a reference.

I'm probably messing around unnecessarily but I don't want to fry the module.

Thanks

Paolo