I have several questions regarding bq40z50 operation:
1. What are data found in Calibration->Current , namely CC Gain and Capacity Gain ?
Are they the value of the shunt resistor used in my application? Because I did set these two parameters to value 5.2 (mOhm) so now bq reports the discharging and charging current correctly.
2 .How do I do the scaling of voltage and current? (if i use an application which has a battery pack for example 48 V/100Ah what values will I modify -like voltage and current gain- in order to get real data ? )
3. If i update the bq data flash with the values provided by the corresponding battery file found under Chemistry tab, do I need to set/modify the values of protection thresholds and the values of advanced charging algorithm? Or those values in the file will do just fine given I have specified the number of cell , design capacity ?
4.I have not found very much informations about AFE. What are its features?
5. Is Cell x CompRes parameter found under Register tab in Battery Management Studio the same as Cell Resistance found in bq Reference Manual (page.13) ?
6. In Reference Manual they say about Rsense used for calculation of thresholds for overload protection. Is Rsense a parameter I can modify in Battery management Studio or represent the shunt resistor value used in my design?
7. What is the time constant of Average Current? Or , after what time the Average Current becomes equal with the instantaneous current ?
8. If bq enter is one of the permanent fail protections the FETs are turned off. Are they turned off for ever? Can't the CHG/DSG process be restarted? Or I should just change the bq?
9. My bq reports a voltage bigger on PACK side that on BAT side (~50mV difference) (without charger, when discharging)
10. Should I consider Cell grid , Pack grid values ; Ra table values ?
11. How to use Cell gain , Pack gain , Bat gain values? For example in my case for a pack voltage of 12 V bq reports a pack gain of 49 thousands. Bat Gain is slightly lower ( ~48 thousands )