Datasheet

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.
SEG
1
–
SEG
6
LED display segment outputs (dual func
-
tion with PROG
1
–PROG
6
)
Each output may activate an LED to sink
the current sourced from LCOM.
PROG
1
–
PROG
2
Programmed full count selection inputs
(dual function with SEG
1
–SEG
2
)
These three-level input pins define the pro
-
grammed full count (PFC) thresholds de
-
scribed in Table 2.
PROG
3
–
PROG
4
Gas gauge rate selection inputs (dual
function with SEG
3
–SEG
4
)
These three-level input pins define the scale
factor described in Table 2.
PROG
5
Self-discharge rate selection (dual func-
tion with SEG
5
)
This three-level input pin defines the
selfdischarge compensation rate shown in Ta-
ble 1.
PROG
6
Display mode selection (dual function
with SEG
6
)
This three-level pin defines the display op
-
eration shown in Table 1.
NC
No connect
SR
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).
DISP
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.
SB
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.
EMPTY
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.
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.
V
CC
Supply voltage input
V
SS
Ground
2
bq2010