Hello Mr.BOB. Thank you for your support. It has been really helpful in implementing our circuit faster for our prototype. As per your recommendations I have made the necessary changes in the overall block diagram scheme of 32 channel data logger as shown(Please visit the site to view this file) I had also changed the power supply section which was my error. Still I have some queries:
a) For 32 channel data acquisition, I have used 8 ADS1148. Since SCK, DIN and START pins are multiplexed only 3 ports are used for them. But since DOUT/DRDY, CS and DRDY are not multiplexed(short together), I need 24 extra port lines of microcontroller for them. How can I reduce these port lines?
b) Whether DOUT line can be multiplexed as in usual standard SPI configuration MISO(for microcontroller) is multiplexed?
c) I feel that I would be using internal reference and remove external reference of 2.5V which was given to REFP1 which I think would be better. I will retain the capacitor of 10UF between REFP1 and REFN1.
Regards,
Dhiren