參數(shù)資料
型號(hào)： bq2092
廠商： Benchmark Technology Group
英文描述： Gas Gauge IC with SMBus-Like Interface(Gas Gauge芯片（帶SMBus 接口）)
中文描述： 氣體計(jì)IC一樣，帶有SMBus接口（電量監(jiān)測(cè)計(jì)芯片（帶的SMBus接口））
文件頁(yè)數(shù)： 5/28頁(yè)
文件大小： 213K
代理商： BQ2092
Voltage Thresholds
In conjunction with monitoring V
SR
for charge/discharge
currents, the bq2092 monitors the battery potential
through the SB pin.
The voltage potential is deter-
mined through a resistor-divider network per the
following equation:
R
R
2.25
4
MBV
5
1
=
where MBV is the maximum battery voltage, R
5
is
connected to the positive battery terminal, and R
4
is
connected to the negative battery terminal. R
5
/R
4
should
be rounded to the next highest integer. The voltage at
the SB pin (V
SB
) should never exceed 2.4V.
The battery voltage is monitored for the end-of-
discharge voltage (EDV), for maximum pack voltage and
for alarm warning conditions. EDV threshold levels are
used to determine when the battery has reached an
“empty” state, and the charging voltage plus 5% thresh-
old is used for fault detection during charging. The
battery voltage gain, two EDV thresholds, and charge
voltage limit are programmed via EEPROM.
Programming the bq2092 section for further details.
See the
If V
SB
is below either of the two EDV thresholds, the associ-
ated flag is latched and remains latched, independent of
V
SB
,until the next valid charge.
EDV monitoring may be disabled under certain condi-
tions. If the discharge current is greater than approxi-
mately 6A, EDV monitoring is disabled and resumes
after the current falls below 6A.
Reset
The bq2092 is reset when first connected to the battery
pack.
The bq2092 can also be reset with a command
over the serial port, as described in the Software Reset
section.
Temperature
The bq2092 monitors temperature using an internal
sensor. The temperature is used to adapt charge/dis-
charge and self-discharge compensations as well as
maximum temperature and
T/
t during bq2092 con-
trolled charge. Temperature may also be accessed over
the serial port. See the Programming the bq2092 section
forfurtherdetails.
Layout Considerations
The bq2092 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.
ground with small signal ground causes undesirable
noise on the small signal nodes. Additionally, in refer-
ence to Figure 1:
Sharing high-current
The capacitors (C1, C2, and C4) should be placed as
close as possible to the SB and V
CC
pins, 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 capacitor (C3) should be placed as
close as possible to the SR pin.
The sense resistor (R1) should be as close as possible
to the bq2092.
The IC should be close to the cells for the best
temperature measurement.
An optional zener may be necessary to ensure V
CC
is
not above the maximum rating during operation.
Gas Gauge Operation
The operational overview diagram in Figure 2 illus-
trates the operation of the bq2092. The bq2092 accumu-
lates a measure of charge and discharge currents, as
well as an estimation of self-discharge. Charge currents
are compensated for temperature and state-of-charge.
Self-discharge is only temperature-compensated.
The main counter, RemainingCapacity (RM), represents
the available battery capacity at any given time. Battery
charging increments the RM register, whereas battery
discharging and self-discharge decrement the RM register
and increment the Discharge Count Register (DCR).
The Discharge Count Register (DCR) is used to update
the FullChargeCapacity (FCC) register only if a
complete battery discharge from full to empty occurs
without any partial battery charges.
bq2092 adapts its capacity determination based on the
actual conditions of discharge.
Therefore, the
The battery's initial capacity is equal to the DesignCapacity
(DC).
Until FCC is updated, RM counts up to, but not
beyond,thisthresholdduringsubsequentcharges.
1.
FullChargeCapacity or learned-battery
capacity:
FCC is the last measured discharge capacity of the
battery. On initialization (application of V
CC
or reset),
FCC = DC. During subsequent discharges, the FCC
is updated with the latest measured capacity in the
Discharge Count Register, representing a discharge
from full to below EDV1.
necessary for a capacity transfer from the DCR to the
FCC register. The FCC also serves as the 100% ref-
erence threshold used by the relative state-of-charge
calculation and display.
A qualified discharge is
5
bq2092
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