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BQ2011 Datasheet(PDF) 2 Page - Texas Instruments

Part No. BQ2011
Description  Gas Gauge IC for High Discharge Rates
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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BQ2011 Datasheet(HTML) 2 Page - Texas Instruments

 
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Pin Descriptions
MODE
Display mode output
When left floating, this output selects rela-
tive mode for capacity display. If connected
to the anode of the LEDs to source current,
absolute mode is selected for capacity dis-
play. See Table 1.
SEG1
SEG5
LED display segment outputs
Each output may activate an LED to sink
the current sourced from MODE, the bat-
tery, or VCC.
PFC
Programmed full count selection input
This three-level input pin defines the pro-
grammed full count (PFC) thresholds and
scale selections described in Table 1.
The
state of the PFC pin is only read immediate-
ly after a reset condition.
SR
Sense resistor input
The voltage drop (VSR) across the sense re-
sistor RS is monitored and integrated over
time to interpret charge and discharge activ-
ity. The SR input is tied to the low side of
the sense resistor. VSR >VSS indicates dis-
charge, and VSR <VSS indicates charge. The
effective voltage drop, VSRO, as seen by the
bq2011 is VSR +VOS (see Table 3).
NC
No connect
DISP
Display control input
DISP floating allows the LED display to
be active during charge and discharge if
VSRO < -1mV (charge) or VSRO > 2mV (dis-
charge).
Transitioning DISP low activates
the display for 4
± 0.5 seconds.
SB
Secondary battery input
This input monitors the single-cell voltage
potential through a high-impedance resis-
tive divider network for the end-of-discharge
voltage (EDV) threshold and maximum cell
voltage (MCV).
RBI
Register backup input
This input is used to provide backup potential
to the bq2011 registers during periods when
VCC
≤ 3V. A storage capacitor should be con-
nected to RBI.
DQ
Serial I/O pin
This is an open-drain bidirectional pin.
REF
Voltage reference output for regulator
REF provides a voltage reference output for
an optional micro-regulator.
VCC
Supply voltage input
VSS
Ground
2
bq2011


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