ADS1299: ads1299. Connection 3 ADS1299 by one SPI

michail Nemov

Part Number: ADS1299

Hello, I would like to connect 3 ADS1299 to 1 SPI protocol, it is poss ible? Please, see the picture, is it the correct connection?

over 4 years ago

0 Praveen Aroul over 4 years ago

TI__Mastermind 49786 points

Hello Michail,

Welcome to TI E2E forum!

Please refer to section 10.1.4 in the ADS1299 datasheet for multiple device configuration.

You cannot short the DRDY output together since it is not open drain output.

If you keep the device synchronized by using the START signal (refer figure 69), then you can use one DRDY signal from one of the devices as the data ready interrupt to the processor.

0 michail Nemov over 4 years ago in reply to Praveen Aroul

Prodigy 30 points

Praveen, thank you so much for your reply!!! now I think that should be better, I did according to the manual, how you think, this scheme is is correct?

if I correct understand I can connect only 1 DRDY from only one ADS1299 (in this scheme I connected separately to stm32)