activated, the display changes to the
Monitor screen with a top display of:
Logging Record: xx
<Display
Program
Menu>
Activates a screen showing the current
program settings for the bq2014.
<Measure
V
OS
>
This allows the user to determine the ap-
parent offset voltage of the bq2014 under
test.
A minimum of 6 minutes are re-
quired to complete the V
OS
measurement,
which has a resolution of
±
0.15mV per 6
minutes.
Monitor Screen
This screen monitors real-time changes of the bq2014;
see Figure 2. The program continually updates the
monitor screen. As conditions change, the new values
are displayed.
Time
Time of day in HH:MM:DD, 24-hour nota-
tion.
Empty/Full
This indicates the current value for GG in
the TMPGG register of the bq2014. The
capacity value is given in
1
16
th steps.
Date
Current date in MM/DD/YY notation.
NAC
NAC register values multiplied by the
scale value and divided by the sense resis-
tor value to give mAh.
LMD
Last Measured Discharge expressed in
terms of mAH. This is the 8-bit LMD reg-
ister value multiplied by the scale value
times 256 and divided by the sense
resistor to give mAh.
Sense Resis-
tor Value
This is the sense resistor value from the
Programming menu.
Average V
SR
Current
This is the average battery current.
Time
Remaining
During discharge only, this is the time re-
maining at the average current (NAC /
Avg. V
SR
current)
Digital
Filter Setting
This is the value of the digital magnitude
filter.
Temp Step
This is a display of the active tempera-
ture step, which ranges from 0 (for tem-
peratures <-30°C) to 12 for temperatures
> 80°C).
Activity
This indicates the charging/discharging
activity occurring with the battery.
CHARGE is displayed if the battery is
charging, while DISCHARGING is dis-
played if the battery is being discharged,
or if it is idle (no charging taking place).
OVERLOAD is displayed if the voltage
drop across the sense resistor exceeds the
V
SR1
threshold. Please note that the ap-
pearance of CHARGE or DISCHARGE in-
dicators is rate-dependent, and may take
some time after the application of a
charging current or a discharge load de-
pending on the PFC and scale selected,
and the rate of charge or discharge being
applied.
4
Benchmarq BQ2014 Evaluation Board Main Menu (v2.3)
<Initialize>
<Monitor>
<Digital Filter>
<Data Log>
<Display Program>
<Measure Vos>
Please enter the SR, # of cells in Display Program for Proper Operation
ESC to exit program
F3 for Help
Figure 1. Main Menu
EV2014
Rev. B Board