BQ2013H Datasheet, PDF (2/24 Pages) Texas Instruments – Gas Gauge IC for Power- Assist Applications

bq2013H
Pin Descriptions
LCOM LED common
This open-drain output switches V_CC to source
current for the LEDs. The switch is off during
initialization to allow reading of PROG_1-5
pull-up or pull-down program resistors. LCOM
is also high impedance when the display is off.
SEG₁–
SEG₅
LED display segment outputs (dual func-
tion with PROG₁–PROG₅
Each output may activate an LED to sink
the current sourced from LCOM.
PROG₁–
PROG₆
Programmed full count selection inputs
(dual function with SEG₁ - SEG₅)
These three-level input pins define the pro-
grammed full-count (PFC), display mode,
self-discharge rate, offset compensation,
overload threshold, and charge compensa-
tion.
SR
Sense resistor input
DONE
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 (see Figure 1) is connected
between the negative terminal of the battery
and ground. V_SR > V_SS indicates charge, and
V_SR < V_SS indicates discharge. The effective
voltage drop, V_SRO, as seen by the bq2013H
is V_SR + V_OS.
Charge complete input
This input/output is used to communicate
the status of an external charge controller to
the bq2013H.
DISP
SB
RBI
HDQ
REF
V_CC
V_SS
Display control input
DISP pulled high disables the display.
DISP floating allows the LED display to
be active during certain charge and dis-
charge conditions. Transitioning DISP
low activates the display.
Secondary battery input
This input monitors the scaled battery volt-
age through a high-impedance resistive di-
vider network for the end-of-discharge volt-
age (EDV) thresholds.
Register backup input
This input is used to provide backup poten-
tial to the bq2013H registers during periods
when V_CC < 3V. A storage capacitor can be
connected to RBI.
Serial I/O pin
This is an open-drain bidirectional commu-
nications port.
Voltage reference output for regulator
REF provides a voltage reference output for
an optional micro-regulator.
Supply voltage input
Ground
2