Sorry the DAC is MAX5217

From newbie to this task is about 3 years of experience.
You should start wirh a much simple idea.

Yours

hi

it dosn't matter what bit-with your mcu has. it dosn't even matter if it 
has a build in I2C Interface,you can do this by Bitbaning on every 
Micro.

You do not need a 16bit Microcontroller to process 16bit data. Every 
8bit controller is capable to handle up to 64bit data without no 
overhead from the programmers pint of view. And with some overhead it 
can process any data that fit into the RAM.

Of courde, a native 64bit controller would process 64bit data faster. 
But that's obviously not improtant for your project.

The interfaces are more interesting. If you find one that contains all 
required interfaces then you have a nice single-chip solution. As more 
chips you need as more error you may do.

Almost all microcontrollers are primarily programmed in C.

AVR microcontrollers (e.g. ATmega328P or ATmega32U4) are easy to learn 
and there are lots of informations online. If you want something larger 
then I would recommend any ARM based microcontroller, for example the 
STM32F103 series which is available in different sizes).

Regarding your current monitor: If you measre the current between power 
supply and voltage regulator then you measure the current consumption of 
the voltage regulator + the load. So it would be more preciseto measure 
the current at the output. Many voltage regulators have a separate 
feedback pin which you can use to overcome the voltage loss at the 
current sensor (shunt).

Thanks alot Stefan.

which wanna would you recommend to control the MAX5217 for the best 
results and more accurate? price is not important.

the STM32F103 ?

What about the Arduino Uno wouldn't be a better choice?

It depends on your skills. It seems that you are not familiar with 
microcontrollers, so start with Arduino Nano modules (ATmega328P). You 
can program them with and without Arduino software. They are cheap, well 
documented and have a very easy to use USB interface.

> What about the Arduino Uno wouldn't be a better choice?

The Arduino Uno is also Ok, but quite large. Arduino Nano has almost the 
same capabilities.

Thanks alot Stefan

I will buy the Arduino Nano and work with the offline Webeditor and try 
to control the MAX5127.

Just for the case that the Arduino Nano has not enough I/O pins: The 
ATmega2560 has much more of them and is also avaiable as a module with 
USB connector.

But I would first check the smaller microcontroller, It's much more 
handy. The programming model is the same on both.

Stefan U. wrote:
> You do not need a 16bit Microcontroller

But you can!

Don 't start with frustrating avr. Better try msp430.

Fadi Safadi wrote:
> Can someone briefly explain for me, which microcontroller i need to
> control my DAC517

Industry would say: the cheapest that can do the job.

> and which software i have to write?

Seems to be a simple control program  not very fast not very complex so 
even an ATmega8 can do the job. But of course you may have missed to 
describe the bog hog part of it.

> which tools or softwares do i need?

Use an Arduino. Simple Software and programmable over USB.
Not the cheapest but low tco.