9.3 Initialization Set Up
After reset or power-on, configure the ADC using the following procedure:
- Reset the serial interface. Before beginning communication to the ADC, the serial interface may have to be recovered (undefined I/O power-up sequencing can cause a false SCLK to occur). To reset the interface, toggle the CS pin high to low, or toggle the RESET pin.
- Configure the registers. For proper operation, the MODE[2:0] bits and the BIAS bit must be programmed appropriately; see the MODE[2:0] bits in Table 20.
- Verify register data. For verification of device communications, read back the register data.
- Set the data mode. After register configuration, configure the device for read-data-continuous mode by sending the RDATAC command.
- Synchronize readings. After power-on, the ADCs are unsynchronized and conversions freely run. To synchronize the conversions in pulse-sync mode, take SYNC low and then high. In continuous-sync mode, apply the synchronizing clock to the SYNC pin under the operating constraint that the SYNC input period is equal to integer multiples of the ADC conversion period.
- Read data. In read-data-continuous mode, the data are read after DRDY falls by shifting the data out directly (no command). If the stop-read-data-continuous mode is selected, read the data by sending the RDATA command. The RDATA command must be sent in this mode for each conversion result.