The device includes a mode where the contents of the internal registers can be read back using the SDIO pin. This readback mode can be useful as a diagnostic check to verify the serial interface communication between the external controller and the ADC. The procedure to read the contents of the serial registers is as follows:
- Drive the SEN pin low
- Set the R/W bit (A15) to 1. This setting disables any further writes to the registers. Set A[14:12] in address field to 0.
- Initiate a serial interface cycle specifying the address of the register (A[11:0]) whose content must be read
- The device outputs the contents (D[7:0]) of the selected register on the SDIO pin
- The external controller can latch the contents at the SCLK falling edge
Figure 8-51 Serial Register Read Timing Diagram