ADS1291 CLK and SPI CLK. Need help

wang po shen

Intellectual 260 points

Other Parts Discussed in Thread: ADS1291

hello everyone.

i have some problems to retrieve data from ADS1291.

i am using CLK=2.048 MHZ for ADS1291.

can i use SPI CLK =4MHZ?

thanks for your help.

over 12 years ago

0 Ryan Andrews over 12 years ago

TI__Guru 66166 points

Hi Wang,

Running your SPI CLK (SCLK) at 4MHz is perfectly acceptable for FCLK = 2.048MHz. During Read/Write commands, SCLK would be limited to 4.096MHz; otherwise, it could run up to 20MHz.

Pages 27-28 of the datasheet further explain the requirements of the clock and SPI interface:

http://www.ti.com/general/docs/lit/getliterature.tsp?genericPartNumber=ads1291&fileType=pdf

Hope this helps!

Regards,

0 wang po shen over 12 years ago in reply to Ryan Andrews

Intellectual 260 points

hi Ryan. I still have some problems about ADS1291.

Now i can write/read ADS1291 registers successfully with 2.048MHZ ADS1291 CLK and 4MHZ SPI CLOCK

but it seems that i can't read the converted data correctly.

can i possibly sent you my source code?

hope you can check it out for me.

thanks a lot

0 NarasimhaMurthy over 11 years ago in reply to wang po shen

Prodigy 90 points

Hi wang

Are still struggling with your problem ??I will try my best to help you.

Regards

Murthy

Data converters

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ADS1291 CLK and SPI CLK. Need help