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Estimating SOC with LTC2949 for big battery packs


I have an enclosed battery pack (Li-NMC) and I need to estimate the state of charge of a (70V - 50V) battery, max and min values (63V nominal). I have found a battery monitor which is LTC2949 but it doesn't include the necessary hardware in order to apply an algorithm for estimating SOC. So, could anyone tell me how could I do it for sending the data LTC2949 provide to an other IC and process this information and having an accurate measurement of SOC?

Thank you,