How to use external ADC with SPI(SSC)?

"In case of 10bit ADC, there are a lot of error ... I may select 14bit ADC"

What errors?

If you are getting errors at 10 bits, how do you suppose that moving to 14 bits will help?

Your analogue design & construction requirements will be far more strenuous at 14 bits than at 10 - otherwise you'll just get an extra 4 meaningless bits of noise/errors!

"In case of 10bit ADC, there are a lot of error ... I may select 14bit ADC"

What errors?

If you are getting errors at 10 bits, how do you suppose that moving to 14 bits will help?

Your analogue design & construction requirements will be far more strenuous at 14 bits than at 10 - otherwise you'll just get an extra 4 meaningless bits of noise/errors!

Thanks for your advice!
Sorry to don't use clear definion - 'error' , I say error means that current range resolution is so big. e.g, 1) 500A / 2^10 = 0.48A, 2) 500A/2^14 = 0.03A.
After all, if I use 10 bit ADC, it always has 0.48A over.

So you want to be able to measure current in a 500A range with better than 0.1% resolution?
(1 part in 2^10)

Does your current shunt have better than 0.1% accuracy?
Is all your analogue circuitry better than 0.1% accuracy?

The above need to include all sources of error, noise, distortion, drift, etc, etc,...

Are you really certain that you can actually measure the difference between -250.00A and -249.52A ?

Let alone the difference between -250.00A and -249.97A ?!

Hi,
make a different between resolution and presision.
For example you can have a 16 Bit resolution but only 0.5% presision.

Use a 4-Wire Shunt, my recommandantation is 100uOhm.

Thanks Andy!

Actually I mean it does not need to measure precisonally in high current range, but it is important to measure exactally in low current range such as -5A to +5A.

I woud like to thanks for your opinion of ADC, But I really want to know is SPI programming with XC164CS. Especially, how to transfer command and receive data between controller and external ADC with SPI.

I used 0.1mohm(100uohm) shunt 1% tolerance.

"how to transfer command and receive data between controller and external ADC with SPI"

That will be in the Datasheet for the ADC;

And the Manufacturer's Website is the place to look for Application Notes, sample code, and other specific support information...

Thansk Andy!

I already followed your suggstion a few days ago!
I think it takes time to have my own skill because I'm a beginner for SPI.