Looking through the bq40z60 datasheet SLUSAW3C I am confused by the naming of components in the charging circuit. Firstly, what is meant by AC Adapter? Is this a wall wart that converts 115vac or 230vac to a lower DC voltage or just converts to a lower AC voltage? AC FET - is this FET so named because it deals with AC voltage? ACP - Adapter input pin, for AC voltage or DC voltage?
The datasheet seems very ambiguous regarding whether to apply AC or DC to charge the batteries. Am I the only one confused by this?
Also, the charging voltage level is not obvious. We are charging a series string of 3 LiFePO4 batteries with a "standard voltage" of 3.2V and cutoff of 3.65V. With three in series we have a standard voltage of 9.6V and cutoff of 10.95V. The datasheet, under section "11 Power Supply Requirements" states "well regulated input voltage supply range 4.0V and 25V.. multi-cell pack, the input voltage should be minimum of 1V above maximum stack voltage." In our case, is maximum stack voltage equivalent to our cutoff voltage of 10.95V? If so, what does well regulated mean in this context, i.e., regulated to what percentage of 10.95V?
Thanks, -mark
