I am using the bq20z45EVM with a 2-cell pack, and a LTC4100 charger development board. Here is what I did the first time, after several days of reading forum posts and documents:
1: reflashed the chip with the attached .senc file (because of this forum post: http://e2e.ti.com/support/power_management/battery_management/f/180/p/176501/635522.aspx#635522)
2:: calibrated using the EVSW for z45
3: set the flash constants for a 2-cell pack according to SLVA347
4: set the BCAST and NR flags
5: connected the discharged cells
6: started the IT learning cycle (0x0021), verified the QEN and VOK flags were set; Status Update was set to 4
7: powered the charger.
Everything looked good as the cells charged. Next morning, FC was set, VOK was cleared, but Status Update was still set to 4.
I depleted the cells and started again at step 1, but turned on logging. This time after charging, Status Update changed to 0x0D, but I went ahead and discharged anyway. At the end of the discharge cycle, everything still looked good, so I powered the charger again. In less than 1/2 hour, the charge was terminated by the OC alarm and Status Update had changed to 0x0E.
Attached are the looging outputs. Thanks for any help.