CCS/AMC1210: Resolver interface

Yaman Zbede

Prodigy 30 points

Part Number: AMC1210
Other Parts Discussed in Thread: ADS1205

Tool/software: Code Composer Studio

Hi,

I am using AMC1210 with ADS1205 for resolver decoding as in the guidance:

http://www.ti.com/general/docs/litabsmultiplefilelist.tsp?literatureNumber=sbaa144

I am using the microcontroller eZdsp f28379D to program and read from the AMC1210.

I have set the registers in the AMC1210 as the following:

0x01: 0x0000

0x07: 0x0000;

0x02: 0x0F7F;

0x08: 0x0F7F;

0x03: 0x7B17;

0x09: 0x7B17;

0x19: 0x03FF;

0x1B: 0x1E72;

My excitation frequency is 10 KHz, clock divider N_CDIV =3, the length of the pattern N_PAT=1024 , SOSR the oversampling ratio= 128 and

ISOR= 24.

I am facing a problem in decoding the resolver outputs. My output signals look like the following

The negative cycle is shifted upward by 1360 and the positive cycle is shifted down by 1360 as well.

Do you have an idea what is wrong and how can I solve this problem?

over 8 years ago

0 Tom Hendrick over 8 years ago

TI__Guru**** 182551 points

Hi Yaman,

Welcome to our e2e forum! By the looks of your waveform, you are displaying 2's complement data from the AMC1210 in straight binary fashion. Look in the CCS plot functions and see if you can verify the data format is correctly set.

0 Yaman Zbede over 8 years ago in reply to Tom Hendrick

Prodigy 30 points

Hi Tom,

Thank you so much.

I have applied the 2's complement to the output but this has not solved the problem.

However, I have noticed that the output signals from the ADS1205 are not correct. I will replace the IC and see if this will solve the problem.

Regards

Yaman

0 Tom Hendrick over 8 years ago in reply to Yaman Zbede

TI__Guru**** 182551 points

Hi Yaman,

How did replacing the chip work out for you?

0 Yaman Zbede over 8 years ago in reply to Tom Hendrick

Prodigy 30 points

Hi,

Unfortunately, The problem was not solved. However I have noticed that the op-amp (which provides the tracking of the reference voltage) has gone. I am replacing it now and will let you know if the problem is solved.

Thanks

Yaman

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CCS/AMC1210: Resolver interface