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LT1991 Individual Battery Cell Monitor for a 4-Cell Battery

LT1991 Individual Battery Cell Monitor for a 4-Cell Battery

High input impedance of LT1991 P3 and M3 inputs, ( 150K ), is used to eliminate errors introduced by the analog switch resistance which is very low compared to LT1991 input resistance. The MSB signal is used to change the common mode voltage when reading the cells on the battery stack.