Hello,
Try setting up ch0 with 0x08 and ch1 with 0x1A. Then put the part in ScanMode2 or 3 (page 32 of the datasheet), set it up so that it scans starting at ch0 and ends at ch1 and use DRDYBCase 3 (page 40). Then monitor pin D6. Every time there is new conversion data D6 will be pulled low. Read registers 0x19 through 0x1C. Register 0x19 bits 2:0 indicate what channel the data is for and registers 0x1A to 0x1C are the data.
Mike