Changing from ADS1298 to ADS1198

Gean Francesco Derosso Chu1

Other Parts Discussed in Thread: MSP430F5529, ADS1298, ADS1198

Hello,

I have an ADS1298 kit and I developed a board of my own using an MSP430f5529 to communicate with the ads1298 board. Everything worked just fine.

Recently I bought an ADS1198 kit and when I tried to use it with the same MSP430 board, it didn't work. The ADS1198 board is working with the MMB0 board, but not with mine.

When I watched the SPI SOMI with the oscilloscope, I noticed that the board is triggering DRDY, but when the SCLK is sent, nothing comes out of the SPI.

The registers values are set the same way that the LabView software does, the AVDD and DVDD are configured the same way my ADS1298 was and the initialization sequence is also the same I used on my ADS1298.

Any idea what could be wrong?

Thanks,

Gean Chu

over 13 years ago

0 Tom Hendrick over 13 years ago

TI__Guru**** 182421 points

Hi Gean,

Welcome to our forum! Have you verified that all the jumpers on the ADS1198 board are in the same way as they are on the ADS1298 board? There is no difference between the two boards except for the actual device soldered onto the PWB, so if the jumpers are all correct, the ADS1198 should work the same way as the ADS1298 (with the exception of the data length).

0 Gean Francesco Derosso Chu1 over 13 years ago in reply to Tom Hendrick

Prodigy 50 points

Hi Tom,

Thank you for your quick response.

Yes, all the jumpers are configured the same way as in the AS1298 board.

0 Gean Francesco Derosso Chu1 over 13 years ago in reply to Gean Francesco Derosso Chu1

Prodigy 50 points

Hi Tom,

I believe I've found the problem. I think the ADS1198 board and the ADS1298 board are not equal. The CS pin on the ADS1198 board have a pull-up resistor, and on the ADS1298 board there is no such resistor, as shown on the attached images.

By disabling the pull-up and controlling the CS directly from my board, I managed to make it work.

0 Tom Hendrick over 13 years ago in reply to Gean Francesco Derosso Chu1

TI__Guru**** 182421 points

Great news! The original ADS1298 board was built with the BGA package. The current ADS1298EVM's are using the TQFP, so they share the same PWB. Sorry that I overlooked the /CS thing, but I'm glad to see you found that and got the system running. Let us know how you make out with the MSP430.

0 vijayan over 11 years ago in reply to Gean Francesco Derosso Chu1

Prodigy 50 points

Hi dear friend.,

i am also facing the same problem.can you tell me, what are the value you set for configuring ADS1198 by using GUI software?I just want to check it with my settings.and tell me how to disable the pull up resister with out removing it.

0 vijayan over 11 years ago in reply to Tom Hendrick

Prodigy 50 points

hello tom,

i am working in ads1198.i am little bit confused in ads1198 configuration setting.can you help me how to set the value?

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Changing from ADS1298 to ADS1198