ADT7470 temperature reading failed


     We are using ADT7470 and TMP05 for fans control. Now we can control PWM duty in manu mode and also can read fan tach. But when we try to get temperature from reg 0x20~0x29, we only read the temp of -92  to -102℃,our TMP05 chain has 2 device. Our operation follows the standard procedure in the datasheet, but it can't works. So,  is there any sample code for auto control mode to supply?

Best regards,