Other Parts Discussed in Thread: ISO7763-Q1
Hello TI support team,
I am designing a circuit with three ADS1299-8 in Cascaded Mode.
The ADS1299 therefore share DOUT, DIN and SCLK and have individual !CS1…3 signals.
Their CLK pin will all be driven by an external CLK (2.048Mhz) over an ISO7763-Q1 isolation IC.
I connected only one DRDY signal to the microcontroller handling the SPI, because after synchronize via START all DRDY1…3 should trigger at the same time. After that I would read out every ADS1299 in turn by providing the CS1, CS2 and CS3. This should work because DOUT is in high impedance if CS is not asserted.
One way to synchronize the ADS1299 is to combine all START pins and drive them using a GPIO pin.
Can I instead also use CS1, CS2 and CS3 simultaneously and send a START command via SPI?
Will this work? What happens to shared DIN when there is a Chip Select? I do not really know the driving capabilities of the ISO7763-Q1.
Thank you and kind regards,
Dominik
