topic Re: S32K144 ADC in S32K

S32K144 ADC

raviranjankumar — Sat, 07 Oct 2017 14:06:40 GMT

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.

Re: S32K144 ADC

PetrS — Wed, 11 Oct 2017 07:03:53 GMT

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

Re: S32K144 ADC

raviranjankumar — Wed, 11 Oct 2017 09:36:05 GMT

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.

Re: S32K144 ADC

PetrS — Wed, 11 Oct 2017 10:48:03 GMT

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

Re: S32K144 ADC

raviranjankumar — Wed, 11 Oct 2017 12:09:41 GMT

Hi Petr,

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

Regards,

Ravi Ranjan.

Re: S32K144 ADC

frankzeng — Fri, 09 Mar 2018 12:09:04 GMT

Hi Ravi,

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