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Seems as though the DAC chip is at fault, the SCL line, pin 2 has an internal fault to gnd at pin 4. New chips on order. Ah the joys of prototyping!!! Crying or Very sad

It is too easy to blame the code when ...

CA0 and CA1 are at GND which according to data sheet gives address of 0010000
That's correct, but in your code you have 3 leading zeros on the address.
It should be only 2. The slave address is lef ...

Couple of quick comments...I make the assumption this is real hardware and NOT a simulation (Proteus,etc.)

1) In...
void out_DAC() //Function to write to D/A via I2C
{ ...

What connections do you have to pins CA0 and CA1 on the LTC2631 ?

CA0 and CA1 are at GND which according to data sheet gives address of 0010000

Could someone please help me with my code and please forgive my newbieness. I know the code looks untidy. I am using CCS compiler ver 4.112.

I thought I had this code running in my hardware but no ...