S32K144 ADC

[raviranjankumar]

Hi,

   I am working on S32K144 EVB. I want to configure more than 8 channel at a time. I am using PDB trigger in back to back mode. Up to 9 channel it is working fine. but after that I am not getting result. I am configuring PDB0 channel0 for first 8 channel and PDB0 channel1 for next 8 channel. To trigger  first 8 channel I am giving CH0C1.EN = FF, 

CH0C1.BB = FE (PDB0 channel0) and same for PDB0 channel1 to configure next 8 channel. Is it correct ? 

My configurations are ADC_ALTCLK1, 12-Bit Mode, Divide ratio is 4, sample time is 12.

Please help me. waiting for response....

Thanks and Regard

Ravi Ranjan Kumar.

[frankzeng]

Hi Ravi,

         Did you configure it successfully? And can you share your code for me? I can not configure it successfully.

[PetrS]

Hi Ravi,

the PDB0 ch0 to PDB0 ch1 back-to-back chaining is not possible. PDB back to back operation forming a ring is supported only on Channel 0 and so just PDB0-PDB1 ring is possible if SIM_CHIPCTL[PDB_BB_SEL]=1.

BR, Petr

[raviranjankumar]

Hi Petr,

      Thanks for reply. That means if I want to use more than 8 channel in back to back mode then I can use ADC0  eight channels and ADC1 eight channels ( I tested it is working fine) . In single ADC module I can't use more than 8 channels. Is it correct?

Thanks and Regards,

Ravi Ranjan.

[PetrS]

Hi Ravi,

yes, the back-to-back connection between channels within PDB module is not available. Tables 41-4/41-5 gives you a summary.

If you want to use more than 8 channels on single ADC module then you need to trigger each PDB0 channels separately with proper delay, so the chain is finished before next is started. 

BR, Petr

[raviranjankumar]

Hi Petr, 

         Thank you so much. It was really helpful for me.

Regards,

Ravi Ranjan.