Compiler/MSP430F67641A: SAR ADC sample interrupts stop after some time

satish sharma13

Intellectual 470 points

Part Number: MSP430F67641A

Tool/software: TI C/C++ Compiler

Dear Sir/madam,

I am Triggering my SAR adcs with sigma delta Adcs ..

and using only 5 Channels of SAR adcs ..

And during the period of sigma delta adcs interrupt i am getting my all 5 channel SAR adcs interrupts ..

but after some time in running condition i am unable to get all my SAR adcs interrupts during the period of sigma delta adcs..

over 6 years ago

0 Winter Yu over 6 years ago

TI__Genius 12315 points

Hi satish,

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Winter,

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0 satish sharma13 over 6 years ago

Intellectual 470 points

Part Number: MSP430F67641A

Tool/software: TI C/C++ Compiler

Dear Sir/Madam,

I am triggering my SAR adc with Sigma Delta adc ..

and i have seen there is some role of These three Register SD24BPRE0,SD24BPRE1,SD24BPRE2..

When my Pre is more than appox.300 my sigma delta and SAR adc is not working file ...

0 James Evans over 6 years ago

TI__Mastermind 49692 points

satish sharma13 said:
but after some time in running condition i am unable to get all my SAR adcs interrupts during the period of sigma delta adcs..

This sounds like it could be caused by the ADC42 errata (see erratasheet for more details).

Regards,

James

0 James Evans over 6 years ago in reply to James Evans

TI__Mastermind 49692 points

Also, please read through the following thread. It should be very helpful.

MSP430F67791A: ADC10 Triggering from SD24 pulse

Regards,

James

0 James Evans over 6 years ago in reply to satish sharma13

TI__Mastermind 49692 points

satish sharma13 said:
When my Pre is more than appox.300 my sigma delta and SAR adc is not working file ...

Make sure your preload values aren't exceeding the OSR value. Otherwise, it rolls over. OSR is used to delay fractional samples and can only go up to a whole sample delay which is equal to the OSR value. If you're using OSR = 256, you're exceeding the limit. If additional delay is required, you'll need to delay whole (integer) samples in your arrays where you're storing the ADC samples.

Regards,

James

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Compiler/MSP430F67641A: SAR ADC sample interrupts stop after some time