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Original question:

ADS1299：Daisy-Chain Mode read data

ADS1299： ADS1299 in Daisy chain mode data read

user6364819
Prodigy 20 points
Part Number: ADS1299

I am going to use four ADS1299 to collect data simultaneously. I want to know all the register data for ADS1299 in Daisy chain mode.

My understanding is to set CS to low, select all ADS1299, and then send 0x20 and 0x17 instructions. Each ADS1299 receives the same register instruction, and then the register data of each ADS1299 is sent to the first register of ADS1299 via DAISY_IN0, and then return to the STM32 chip.

Here are my specific steps :

Firstly, I'm going to pull down all the CS of ADS1299.

Secondly, I'm going to send 0x20 and 0x17.

Thirdly, I'm going to Read 96 register data at one time through SPI.

I have read the register value of the first slice ADS1299, while the other bits ADS12999 have a register value of 0x00.

Do you think that's a reasonable understanding?

I look forward to hearing from you soon.

  • 0
    TI__Guru 66296 points

    Hello,

    Thank you for your post.

    Your understanding is correct. You will need to send two bytes for the RREG command, followed by 18 x 4 bytes (96) to clock out the register data from all devices in the daisy-chain. The data will be read by the microcontroller on the DOUT pin of Device 0 in the chain.

    Best regards,