Hello,
I design a power management system for a battery pack consisted of 16 LiFePO4 cells of 40Ah in series.
For this pack I chose to equip each one of the 16 cells with a temperature sensor... Through these sensors a host micro-controller "knows", among others, the exact average temperature of the battery pack. This micro-controller is also the one that interfaces with the bq34z100 gauge meter IC. Optimally the known cells' temperature info should be used for their temperature compensation calculations of the bq34z100, instead of using the bq34z100 internal temperature sensor (because the IC is not in thermal coupling with the cells), or an external 10K NTC remote sensor (which is much less accurate, and needs extra effort and cost for installation)...
So, is there a way to "write" temperature data in the bq34Z100? If not, could you please inform me about the circuit inside the bq34z100 that it is implemented to interface with the proposed external NTC sensor? I need this information to "emulate" an 10K NTC through the host micro-controller (and perhaps some other circuitry) with the most efficient way.
Finally, is there a more resent and more adequate IC for gauge metering LiFePO4 chemistry batteries (that could possibly allow data entry about the temperature)?
Thank you in advance,
Haris Tsiris.