BQ2010_15 Datasheet, PDF (2/26 Pages) Texas Instruments – Gas Gauge IC

Not Recommended For New Designs
bq2010
Pin Descriptions
LCOM LED common output
Open-drain output switches V_CC to source
current for the LEDs. The switch is off dur-
ing initialization to allow reading of the soft
pull-up or pull-down program resistors.
LCOM is also high impedance when the dis-
play is off.
SEG₁–
SEG₆
LED display segment outputs (dual func-
tion with PROG₁–PROG₆)
Each output may activate an LED to sink
the current sourced from LCOM.
PROG₁–
PROG₂
Programmed full count selection inputs
(dual function with SEG₁–SEG₂)
These three-level input pins define the pro-
grammed full count (PFC) thresholds de-
scribed in Table 2.
PROG₃–
PROG₄
Gas gauge rate selection inputs (dual
function with SEG₃–SEG₄)
These three-level input pins define the scale
factor described in Table 2.
PROG₅
Self-discharge rate selection (dual func-
tion with SEG₅)
This three-level input pin defines the
selfdischarge compensation rate shown in Ta-
ble 1.
PROG₆
Display mode selection (dual function
with SEG₆)
This three-level pin defines the display op-
eration shown in Table 1.
NC
No connect
SR
DISP
SB
EMPTY
DQ
REF
V_CC
V_SS
Sense resistor input
The voltage drop (V_SR) across the sense re-
sistor R_S is monitored and integrated over
time to interpret charge and discharge activ-
ity. The SR input is tied to the high side of
the sense resistor. V_SR < V_SS indicates dis-
charge, and V_SR > V_SS indicates charge. The
effective voltage drop, V_SRO, as seen by the
bq2010 is V_SR + V_OS (see Table 5).
Display control input
DISP high disables the LED display. DISP
tied to V_CC allows PROG_X to connect directly
to V_CC or V_SS instead of through a pull-up or
pull-down resistor. DISP floating allows the
LED display to be active during discharge or
charge if the NAC registers update at a rate
equivalent to |V_SRO| ≥ 4mV. DISP low acti-
vates the display. See Table 1.
Secondary battery input
This input monitors the single-cell voltage
potential through a high-impedance resis-
tive divider network for end-of-discharge
voltage (EDV) thresholds, maximum charge
voltage (MCV), and battery removed.
Battery empty output
This open-drain output becomes high-impedance
on detection of a valid end-of-discharge voltage
(V_EDVF) and is low following the next application
of a valid charge.
Serial I/O pin
This is an open-drain bidirectional pin.
Voltage reference output for regulator
REF provides a voltage reference output for
an optional micro-regulator.
Supply voltage input
Ground
2