ADS1248: ADS1248, register 0A doesn't fit

wang Ranen

Part Number: ADS1248

Hi Ti

When we were debugging ADS1248, we found that register 0A could not be written. Please help to analyze the reasons. The schematic diagram is as follows

ADS1248.pdf

over 4 years ago

0 Alexander Smith over 4 years ago

TI__Mastermind 47625 points

Hi Wang,

Thanks for your post and welcome to the forum!

Can you show oscilloscope screenshots of /CS /SCLK /DIN /DOUT when attempting to read the registers?

0A is the ID register which means most of this register is read only and cannot be written to.

0 wang Ranen over 4 years ago in reply to Alexander Smith

Prodigy 200 points

Hi Smith

Waveform diagram is as follows,Yellow SCK, purple mosi, blue miso.

0 Bob Benjamin over 4 years ago in reply to wang Ranen

TI__Guru** 112795 points

Hi Wang,

It appears from the scope shot that the MOSI is changing on the wrong clock edge (phase). Make sure that the data changes on the rising edge of SCLK and is stable on the falling edge of SCLK. You scope shot shows MOSI changing on the falling edge of SCLK and stable on the rising edge.

Best regards,

Bob B

Data converters

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ADS1248: ADS1248, register 0A doesn't fit