I2C Logic Level Converter for Sensor

Projects Networking, Protocols, and Devices
1

Hi!

my question goes this way: I have a arduino mini pro 5V clone. I connect it to my laptop using a PL2302 converter which has 5v,3.3v,Tx,Rx,Gnd pins. I also have the SI4332 RF Transceivers which runs at 3.3v, i dont have a I2C LLC, can i just connect the Vcc of the SI4332 to the 3.3v of the PL2302, then ground,SDA,SCL goes to the arduino without damaging the RF Transceiver?

Thanks>

2

If you turn off the internal pull-up of the Arduino and insert external pull-ups (~2k7) from SDA and SCL to 3V3, that should work without logic level converters.

3

It only takes two transistors for a level converter:-

translator-1.pdf (21.4 KB)