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Description:
BQ2011SN Gas Gauge IC for High Discharge Rates
Prototype PCB
Part No.:   BQ2011SN
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Description:   Gas Gauge IC for High Discharge Rates
File Size :   195 K    
Page : 21 Pages
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Maker   TI [ TEXAS INSTRUMENTS ]http://www.ti.com
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bq2011
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.
SEG
1
SEG
5
LED display segment outputs
Each output may activate an LED to sink
the current sourced from MODE, the bat-
tery, or V
CC
.
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 (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 low 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
bq2011 is V
SR
+ V
OS
(see Table 3).
NC
No connect
REF
RBI
DISP
Display control input
DISP floating allows the LED display to
be active during charge and discharge if
V
SRO
< -1mV (charge) or V
SRO
> 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).
Register backup input
This input is used to provide backup potential
to the bq2011 registers during periods when
V
CC
3V. A storage capacitor should be con-
nected to RBI.
DQ
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.
V
CC
V
SS
Supply voltage input
Ground
2
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