Thanks Thomas. The device was gone bad, replaced it.
I have facing another issue.
I am trying to configure the BQ device through the microcontroller. I am able to configure a sublcass with out any problem. but when i try to follow the design steps, and configure different subclass in a sequential way, The very first subclass i am trying to configure is getting configured but, the next subclass, i am trying to configure gets NACK.
What might be the issue?