When we connected an AD7143-1 externally to AD7147-1 evaluation board (instead
of AD7147-1), we noticed an automatic change in configuration/ID register of
EEPROM. When we reconnected AD7147-1 (instead of AD7143-1) the configuration/ID
register was not automatically changed back into "normal" value.
If you power down the eval board, and remove the external AD7143-1 board, the
board should power up correctly.