8.5.5.3 Serial Read
Figure 75 shows a typical 4-wire serial register readout. In the default 4-pin configuration, the SDIN pin is the data output from the ADS54J64 during the data transfer cycle when SDOUT is in a high-impedance state. The internal registers of the ADS54J64 can be read out by:
- Driving the SEN pin low
- Setting the R/W bit to 1 to enable read back
- Specifying the address of the register (A[14:0]) whose content must be read back
- The device outputs the contents (D[7:0]) of the selected register on the SDOUT pin (pin 51)
- The external controller can latch the contents at the SCLK rising edge
Figure 75. Serial Interface 4-Wire Read Timing Diagram