Forum Post: ads1256 DRDY and timing

Hello,

i have a general question regarding the /DRDY.

Does this pin always toggle  so that i can use it as trigger for sending data via SPI to the ADC.

I want to simplfy my commication via SPI, and as i read in other threads, there was often the hint to look at the DRDY.

I think of the following:

If DRDY = 1, ADC is busy -> do no communication via SPI

if FallingEdge(DRDY) then ready for communication via SPI.

In general, it is save to trigger always on the falling edge of the DRDY and then start SPI communication?

Or are there situations where DRDY stays low (no falling edge) and does not toggle?

An other question is,

on page 6 in the timing characteristics for figure 1.

t11 describes the waiting time to the next command. How long do i have to wait after command SDATAC?

Regards Gerald