Is there possibility to connect 5V and 3.3V devices in one QWIIC network?

Qwiic System
1

Hi,

Is there possibility to connect 5V and 3.3V devices in one QWIIC network?

Let’s say I’ve BH1750 connected like that:

BH1750 connection.jpg

Does it mean that +5V is present on QWIIC right now instead of 3.3V?

It’s crucial to me, because I want to connect ICM-20948 9DoF over QWIIC and this module is working on 3.3V.

2

Most Qwiic devices are not 5 volt tolerant, if you want to connect a 5 volt device to a Qwiic network, you will need a[ level shifter like the PCA9306 to isolate the 5 volt devices from the 3.3 volt ones.](https://www.sparkfun.com/products/15439)

3

In case sensor board is supporting +5VDC, can I connect +5VDC to QWIIC connector, right?

4

Yes, as long as you keep the 5 volt board on the 5 volt side of your I2C bus, you’re OK.

Just be super careful to not plug in a 3.3 volt Qwiic board into the one that has 5 volt power or you will kill the 3.3 volt board.

5

Ok, that is clear to me:) Thx for answers!