BQ2084DBTR-V150 Datasheet, PDF (20/69 Pages) Texas Instruments – SBS v1.1-COMPLIANT GAS GAUGE WITH LED DELAY

bq2084-V150
SLUS758 – JUNE 2007
www.ti.com
DISP input. The bq2084-V150 can display RM in either a relative or absolute mode with each LED representing
a percentage of the full-battery reference. In relative mode, the bq2084-V150 uses FCC as the full-battery
reference; in absolute mode, it uses Design Capacity (DC). The DMODE bit in Pack Configuration DF 0x28
programs the bq2084-V150 for the absolute or relative display mode. The LED bits program the 3-, 4-, or 5-LED
option.
Activation
The display may be activated at any time by a high-to-low transition on the DISP input. This is usually
accomplished with a pullup resistor and a pushbutton switch. Detection of the transition activates the display and
starts a 4-s display timer. Reactivation of the display requires that the DISP input return to a logic-high state and
then transition low again. The second high-to-low transition can be detected only after the display timer expires.
If unused, the DISP input must be pulled up to VCC. If the EDV0 bit is set, the bq2084-V150 disables the LED
display.
LED Delay
This value sets the activation delay time from one LED to the next LED after the display is activated. Setting the
value to 0s disables this feature.
Display Modes
In relative mode, each LED output represents 20%, 25%, or 33% of the RelativeStateOfCharge() value. In
absolute mode, each LED output represents 20%, 25% or 33% of the AbsoluteStateOfCharge() value. Table 7
shows the display options for 5 LEDs, for 4 LEDs, Table 8 and Table 9 for 3 LEDs. In either mode, the
bq2084-V150 blinks the LED display if RemainingCapacity() is less than Remaining CapacityAlarm(). The
display is disabled if EDV0 = 1.
Table 7. Display Mode for Five LEDs
CONDITION
RELATIVE OR ABSOLUTE
StateOfCharge()
EDV0 = 1
<20%
≤20%, < 40%
≤40%, < 60%
≤60%, < 80%
≤80%
LED1
OFF
ON
ON
ON
ON
ON
FIVE-LED DISPLAY OPTION
LED2
OFF
OFF
ON
ON
ON
ON
LED3
OFF
OFF
OFF
ON
ON
ON
LED4
OFF
OFF
OFF
OFF
ON
ON
LED5
OFF
OFF
OFF
OFF
OFF
ON
Table 8. Display Mode for Four LEDs
CONDITION
RELATIVE OR ABSOLUTE
StateOfCharge()
EDV0 = 1
<25%
≤25%, < 50%
≤50%, < 75%
≤75%
FOUR-LED DISPLAY OPTION
LED1
OFF
ON
ON
ON
ON
LED2
OFF
OFF
ON
ON
ON
LED3
OFF
OFF
OFF
ON
ON
LED4
OFF
OFF
OFF
OFF
ON
Table 9. Display Mode for Three LEDs
CONDITION
RELATIVE OR ABSOLUTE
StateOfCharge()
EDV0 = 1
<34%
THREE-LED DISPLAY OPTION
LED1
OFF
ON
LED2
OFF
OFF
LED3
OFF
OFF
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