ADS1115 5V and I2C

[spuds]

I'm using an ADS1115 with my Rpi.

The sensors connected to a0-a3 output up to 4.5V so I'm using 5V VCC to power the ADS1115 to keep the Ax inputs < Vcc as required.

So the question, is hooking this up straight to the Rpi i2C bus w/o level shift or pull up/down acceptable? I've done it and it works, but there will be other 3V items on the i2C bus as the project grows a bit.

[michaelmeissner]

You should use a level converter. If you have 3.3v i2c devices and 5v i2c devices, you want the level converter between the 3.3v devices and 5v devices. If you only have 5v devices, you want it between the pi and the devices.