Hello all,
I have couple of basic questions related to the schematics of ADS1292R (can be found from user´s guide of demo kit).
1) Which pins are absolutely nessessary to be connected to microcontroller besides SPI connections? I understood at least DRDY should be connected but there was some other option for START and PWDN/RESET? Can these two be command just via SPI? If yes, does it decrease performance or why there are individual leads for these two? For my application it is very important to avoid any extra leads, that is why these questions.
2) I am not going to use RLD, GPIOs, or external clock. Is it ok to float RLDOUT, RLDINV, RLDIN/RLDREF, CLK and CLKSEL pins? I understood that GPIOs should be connected to the ground through resistors shown in example schematics (R32 for GPIO2 and R34 for GPIO1). Is this correct? Should I connect VCAP1 and VCAP2 like they were in example schematics?
3) In schematics, AVSS is analog ground. How about used common ground symbol, is that for digital ground?
4) In example schematics there have been used two different voltage regulator (TPS73033 and TPS73201) for generating analog and digital power supplies. Why it was decided to use both when (in my opinion) either of them would have been suitable for both cases?
Thank you!
BR,
Katariina