BQ2063_15 Datasheet, PDF (16/60 Pages) Texas Instruments – SBS v1.1-COMPLIANT Li-ION GAS-GAUGE IC

bq2063
Not Recommended For New Designs
SBS v1.1ĆCOMPLIANT LiĆION GASĆGAUGE IC
WITH PROTECTOR INTERFACE
SLUS468E− MAY 2001 − REVISED APRIL 2002
display port
general
The display port drives a 4 or 5 LED bar-graph display. The display is activated by a logic signal on the DISP
input. The bq2063 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 bq2063 uses FCC as the full-battery reference;
in absolute mode, it uses dc.
The DMODE bit in Pack Configuration programs the bq2063 for the absolute or relative display mode. The LED
bit in Control Mode programs the 4- or 5-LED option. A fifth LED can be used with the 4-LED display option to
show when the battery capacity is ≥100%.
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 four second 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 must occur after the display
timer expires. The bq2063 requires the input to remain stable for a minimum of 250 ms to detect the logic state.
If unused, the DISP input must be pulled up to V_CC.
If the EDV0 bit is set, the bq2063 disables the LED display. The display is also disabled during a VFC calibration
and should be turned off before entering low-power storage mode.
display modes
In relative mode, each LED output represents 20% or 25% of the RelativeStateOfCharge( ) value. In absolute
mode, each LED output represents 20% or 25% of the AbsoluteStateOfCharge( ) value. Table 6 shows the
display options for 5 LEDs and Table 7 for 4 LEDs.
In either mode, the bq2063 blinks the LED display if RemainingCapacity( ) is less than Remaining
CapacityAlarm( ). The display is disabled if EDV0 = 1.
Table 6. Display Mode for Five LEDs
CONDITION RELATIVE
OR ABSOLUTE
StateOfCharge( )
EDV0 = 1
<20%
≥20%, < 40%
≥40%, < 60%
≥60%, < 80%
≥80%
FIVE LED DISPLAY OPTION
LED1
OFF
ON
ON
ON
ON
ON
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 7. 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
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