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參數(shù)資料
| 型號： | bq2014 |
| 廠商： | Benchmark Technology Group |
| 英文描述： | Gas Gauge IC with External Charge Control(氣體Gauge（帶外部電荷控制）) |
| 中文描述： | 氣體計IC（氣體壓力表與外部充電控制（帶外部電荷控制）） |
| 文件頁數(shù)： | 4/21頁 |
| 文件大小： | 219K |
| 代理商： | BQ2014 |
Voltage Thresholds
In conjunction with monitoring V
SR
for charge/discharge
currents, the bq2014 monitors the single-cell battery po-
tential through the SB pin. The single-cell voltage po-
tential is determined through a resistor/divider network
per the following equation:
R
R
3
N
2
1
=
where N is the number of cells, R2 is connected to the
positive battery terminal, and R3 is connected to the
negative battery terminal. The single-cell battery volt-
age is monitored for the end-of-discharge voltage (EDV)
and for maximum cell voltage (MCV).
levels are used to determine when the battery has
reached an “empty” state, and the MCV threshold is used
for fault detection during charging.
EDV threshold
Two EDV thresholds for the bq2014 are programmable
with the default values fixed at:
EDV1 (early warning) = 1.05V
EDVF (empty) = 0.95V
If V
SB
is below either of the two EDV thresholds, the as-
sociated flag is latched and remains latched, independ-
ent of V
SB
, until the next valid charge (as defined in the
section entitled “Gas Gauge Operation”). The V
SB
value
is also available over the serial port.
During discharge and charge, the bq2014 monitors V
SR
for various thresholds. These thresholds are used to
compensate the charge and discharge rates. Refer to the
count compensation section for details. EDV monitoring
is disabled if V
SR
≤
-250mV typical and resumes sec-
ond after V
SR
> -250mV.
EMPTY Output
The EMPTY output switches to high impedance when
V
SB
< V
EDF
and remains latched until a valid charge oc-
curs.
Reset
The bq2014 recognizes a valid battery whenever V
SB
is
greater than 0.1V typical. V
SB
rising from below 0.25V
or falling from above 2.25V (V
MCV
) resets the device. Re-
set can also be accomplished with a command over the
serial port as described in the Reset Register section.
Temperature
The bq2014 internally determines the temperature in
10°C steps centered from -35°C to +85°C. The tempera-
ture steps are used to adapt charge and discharge rate
compensations, self-discharge counting, and available
charge display translation.
available over the serial port in 10°C increments as
shown below:
The temperature range is
Layout Considerations
The bq2014 measures the voltage differential between
the SR and V
SS
pins. V
OS
(the offset voltage at the SR
pin) is greatly affected by PC board layout. For optimal
results, the PC board layout should follow the strict rule
of a single-point ground return. Sharing high-current
ground with small signal ground causes undesirable
noise on the small signal nodes. Additionally:
The capacitors (C2 and C3) should be placed as close as
possible to the SB and V
CC
pins, respectively, and their
paths to V
SS
should be as short as possible. A
high-quality ceramic capacitor of 0.1
μ
f is recommended
for V
CC
.
The sense resistor (R1, C1) should be placed as close
as possible to the SR pin.
The sense resistor (R16) should be as close as
possible to the bq2014.
4
bq2014
TMPGG (hex)
Temperature Range
0x
< -30°C
1x
-30°C to -20°C
2x
-20°C to -10°C
3x
-10°C to 0°C
4x
0°C to 10°C
5x
10°C to 20°C
6x
20°C to 30°C
7x
30°C to 40°C
8x
40°C to 50°C
9x
50°C to 60°C
Ax
60°C to 70°C
Bx
70°C to 80°C
Cx
> 80°C
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|---|---|
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