Dear TI suppor, Designers
I would like to connect 11 ADS1118/ADS1018 which have SPI interface in daisy chain mode using only one CS to save I/O pins of the micro, Is it possible ?
"For daisy-chaining to work successfully, the ADC slave must be able to input a command at DIN during a given command-cycle (defined by the number of clock pulses required to clock in one command), and output the same command at DOUT during the subsequent command-cycle. Stated simply, there is a DIN-to-DOUT delay of one command-cycle. The slave must, moreover, only execute the command written to it on the rising edge of active-low CS. This means that as long as active-low CS remains low, the slave ignores the command and outputs it at DOUT on the following command-cycle. If active-low CS goes high after a given command-cycle, all slaves execute the commands just written to their respective DIN inputs. If active-low CS goes high, data is not output at DOUT. This process makes it possible for every slave in the chain to execute a different command. As long as these daisy-chain requirements are satisfied, the microcontroller only needs three signals (active-low SS, SCK, and MOSI) to control all the slaves in the network." (maxim app note)
Regard
Paolo
