hiii
Don't you think it would matter what DAC, and what specific 8051?
And by the way: Can you see any single reason why anyone should care to suggest how to do it, when you haven't yourself managed to spend enough time to figure out that the specific components used would be important information?
Now, what about the datasheets/user manuals/application notes for the DAC and the processor? Or how about any sample code available for the processor? And what results did you get from googling? Exactly where are you stuck (or maybe you shouldn't tell us)?
how to interface dac to 8051 using i2c a) choose a chip with HW IIC (all I know have 'sample code') b) do more work
Erik
www.8052.com/.../160143