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Impedance Track 3 for multi-cell LiFePO4 batteries

Other Parts Discussed in Thread: BQ20Z655-R1, BQ40Z60, BQ40Z50

Hi,

I was reading this app note And it talks about using IT3 algorithm with Lithium Phosphate batteries. On the list of devices IT3 is included on, it states the BQ20z6x series. However, on the website for BQ20Z655-R1, it states this device is only for Li-ion and Li-polymer batteries. I was wondering if this is accurate. 

If not, what would you suggest for a 4 cell LiFePO4 fuel gauge? I was also looking at the BQ40Z60.

Thank you for your help,

Josh