ADS1256: ADS1256

user3445415

Part Number: ADS1256

When the mechanical relay work,the DRDY signal will abnormal it always is low level.Lead to the software crash into while loop.

Currently in the DRDY signal add a 13.2k pull-up resistor to 3.3V solved this issue.

I would like to know the DRDY signal output construction.Who can help us?

over 5 years ago

0 Christopher Hall over 5 years ago

TI__Mastermind 44620 points

Hi user3445415,

Welcome to the TI E2E Forums!

I'm not sure I fully understand your issue. Is /DRDY not pulsing in your system?

Would you have a schematic of your circuit that you can share?

/DRDY is a driven output so there shouldn't be a need to add a pull-up resistor, unless you need /DRDY to be high before the ADS1256 has powered-up.

0 user3445415 over 5 years ago in reply to Christopher Hall

Prodigy 30 points

Below is my schematic.

0 user3445415 over 5 years ago in reply to user3445415

Prodigy 30 points

Our issue is :the firmware can't capture the DRDY jumping when the inductive load active . if the inductive load can't work or frequently switching the ADC work is normal. Any comment?

0 Christopher Hall over 5 years ago in reply to user3445415

TI__Mastermind 44620 points

Thanks for sharing a schematic!

May I ask how the inductive load is related to this circuit? Is this load something connected to the ADC inputs, or is it some other circuit within the system?

Looking at the schematic, I noticed the L1 (10uH) inductor on AVDD. This inductor may be interacting with the bypass capacitors and creating an LC resonator. I would recommend removing this inductor since it could be leading to ringing on the AVDD supply.

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ADS1256: ADS1256