Arduino LCD shield with ATtiny84

Hey guys,

I want to meassure the temperature of my fridge and want to visualize it with the arduino lcd shield. Therefore i want to use one wire thermometer, the display and a attiny84.
does anybody tried this before.... looks like the tiny has all necassary pins for that.

But Iam courios about pin 9 (DC).

Would be nice if anybody has some experience to share.
Kind regards