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參數(shù)資料
| 型號： | bq2014H |
| 廠商： | Benchmark Technology Group |
| 英文描述： | Low-Cost NiCd/NiMH Gas Gauge IC(低價格NiCd/NiMHGas Gauge芯片) |
| 中文描述： | 低成本鎳鎘/鎳氫電池電量監(jiān)測計芯片（低價格鎳鎘/ NiMHGas計芯片） |
| 文件頁數(shù)： | 2/22頁 |
| 文件大?。?/td> | 185K |
| 代理商： | BQ2014H |
Pin Descriptions
LCOM
LEDcommonoutput
Open-drain output that switches V
CC
to
source current for the LEDs. The switch is
off during initialization to allow reading of
the soft pull-up or pull-down program resis-
tors. LCOM is also high impedance when the
display is off.
SEG
1
–
SEG
5
LED display segment outputs (dual func-
tion with PROG
1
–PROG
5
)
Outputs that each 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
)
Three-level input pins that define the pro-
grammed full count (PFC) thresholds de-
scribed in Table 2.
PROG
3
–
PROG
4
Power gauge scale selection inputs (dual
function with SEG
3
–SEG
4
)
Three-level input pins that define the scale
factor described in Table 2.
PROG
5
Self-discharge rate selection (dual func-
tion with SEG
5
)
Three-level input pin that defines
self-discharge and battery-compensation fac-
tors as shown in Table 1.
the
DONE
Charge complete input
Communicates the status of an external
charge-controller such as the bq2004 Fast-
Charge IC to the bq2014H. Note: This pin
must be pulled down to V
SS
using a 200k
resistor.
V
SS
Ground
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. V
SR
< V
SS
indicates discharge, and V
SR
>
V
SS
indicates charge. The effective voltage
drop, V
SRO
, as seen by the bq2014H is V
SR
+
V
OS
.
DISP
Display control input
DISP high disables the LED display. DISP
tied to V
CC
allows PROG
X
to connect di-
rectly 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
charge. DISP low activates the display. See
Table 1.
SB
Secondary battery input
Monitors the battery cell-voltage potential
through a high-impedance resistive divider
network for end-of-discharge voltage (EDV)
thresholds and for battery-removed
detection.
RBI
Register backup input
Provides backup potential to the bq2014H reg-
isters while V
CC
≤
3V. A storage capacitor or
a battery can be connected to RBI.
HDQ
Serial communication input/output
This is the open-drain bidirectional commu-
nications port.
NC
No connect
REF
Voltage reference output
REF provides a voltage reference output for
an optional microregulator.
V
CC
Supply voltage input
2
bq2014H
Preliminary
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