AFE7444EVM: Register read/write using SPI

Hi Jerry,

Can you verify that you are meeting the setup and hold times for the serial ports? The timing requirements for the serial ports are shown in section 6.10 of the datasheet.

Regards,

David Chaparro

Jerry,

Your reply got deleted. I have copied your reply and I am attaching it to the post.

Hi David,

Thanks for the answer.

I didn't really get your answer. Do you mean that i should let 20ns (15 of setup time & 5 of hold time) before starting the transmission ? On this period, should i send 0x00 or specific bytes ?

Thanks in advance.

Jerry

Jerry,

For the setup time, the data must be stable at its state for this amount of time before the rising edge of the clock. For the hold time, the is the minimum amount of time the data should be stable at its state after the rising edge of the clock. 

To help us solve your problem can you use an o-scope to probe the SPI lines when you are sending data and share pictures of the results?

For additional information on the timing requirements you can look at this document using this link: https://training.ti.com/sites/default/files/docs/adcs-spi-communications-timing-presentation.pdf 

Regards,

David Chaparro