The gauge's Data Memory is configured in
bqStudio from the Data Memory window. This window is shown below in Figure 8-1.
The necessary data memory configurations
will be made in this screen, using only the [Advanced Charging Algorithm] and [Gas
Gauging] sections of the data memory window. Use the Filter/Search box to find
specific parameters. Use the Write All button to write data memory parameters that
have been changed on this screen to the gauge. Use the Read All button to read the
current data memory configurations from the gauge and verify a successful write. Ensure that
each value is programmed in the correct unit, indicated in the third column for each data
memory parameter.
The following are
the data memory values that should be programmed:
- [Advanced Charging
Algorithm][Termination Config][Charge Term Taper Current]: This value should be set
slightly higher than the actual taper current between C/10 and C/100. This value should
also be higher than the [Chg Current Threshold] value.
- [Gas Gauging][Design][Design
Voltage]: This value can be found in the battery data sheet as the nominal or
average voltage.
- [Gas Gauging][Design][Design Capacity
mAh]: This value can be found in the battery data sheet as battery capacity and is
often referred to as C.
- [Gas Gauging][Design][Design Capacity
cWh]: This value is the battery capacity in centiwatt hours. This value might be in
the battery datasheet, or can be found by multiplying the capacity in mAh by the terminal
voltage in Volts, then dividing by 10.
- [Gas Gauging][IT Cfg][Term
Voltage]: This value can be found in the battery data sheet as the terminal voltage.
This is the lowest voltage that the gauge should charge to.
- [Gas Gauging][Current Thresholds][Dsg
Current Threshold]: This current value is where the gauge recognizes that the
battery is being discharged. Set this value below C/10, as a positive number. The gauge
will interpret it as a negative.
- [Gas Gauging][Current Thresholds][Chg
Current Threshold]: This current value is where the gauge recognizes that the
battery is being charged. Set this value below C/10 and also lower than the Charge Term
Taper Current.
- [Gas Gauging][Current Thresholds][Quit
Current Threshold]: This value is where the gauge enters relax mode. It should be
less than C/20 and lower than the [Dsg Current Threshold] and [Chg Current
Threshold].
Figure 8-2 shows a visual representation of the current during the course of a learning cycle
relative to the data memory current parameters set.