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參數(shù)資料
| 型號： | bq2040 |
| 廠商： | Benchmark Technology Group |
| 英文描述： | Gas Gauge IC With SMBus Interface(氣體Gauge芯片（帶SMBus 接口）) |
| 中文描述： | 氣體計IC，帶有SMBus接口（氣體計芯片（帶的SMBus接口）） |
| 文件頁數(shù)： | 9/32頁 |
| 文件大?。?/td> | 189K |
| 代理商： | BQ2040 |
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Charge Suspension
The bq2040 may temporarily suspend charge if it detects
a charging fault. The charging faults include the follow-
ing conditions:
n
Maximum Overcharge:
If charging continues for
more than the programmed maximum overcharge
limit as defined in EE 0x3a—0x3b beyond RM=FCC,
the Fully_Charged bit is set, and the requested
charging current is set to the maintenance rate.
n
Overvoltage:
An over-voltage fault exists when the
bq2040 measures a voltage more than 5% above the
ChargingVoltage.
When the bq2040 detects an
overvoltage condition, the requested charge current is
set to 0 and the Terminate_Charge_Alarm bit is set
in BatteryStatus. The alarm bit is cleared when the
current drops below 256mA and the voltage is less
than 105% of ChargingVoltage.
n
Overcurrent:
An overcurrent fault exists when the
bq2040 measures a charge current more than 25%
above the ChargingCurrent. If the ChargingCurrent
is less than 1024mA, an overcurrent fault exists if the
charge current is more than 1mA above the lowest
multiple of 256mA that exceeds the ChargingCurrent.
When the bq2040 detects an overcurrent condition, the
requested
charge
current
Terminate_Charge_Alarm bit is set in Battery Status.
The alarm bit is cleared when the current drops below
256mA.
is
set
to
0
and
the
n
Maximum
temperature
temperature, the requested charge current is set to
zero
and
the
Over_Temp_Alarm
Terminate_Charge_Alarm bits are set in Battery
Status. The Over_Temp_Alarm bit is cleared when
the temperature drops to 43°C below the maximum
temperature threshold minus 5
°
C.
Temperature
:
equals
When
the
battery
maximum
the
programmed
and
the
n
PSTAT:
When the PSTAT input is
≥
1.5V, the
requested charge current is set to 0 and the
Terminate_Charge_Alarm bit is set in BatteryStatus
if the Discharging flag is not set. The alarm bit is
cleared when the PSTAT input is <1.0V or the
Discharging flag is set.
n
Low Temperature:
When the battery temperature
is less than 12°C (LTF bit in FLAGS2 set), the
requested charge current is set to the maintenance
rate.
Once the temperature is above 15
°
C, the
requested charge current is set to the fast rate.
n
Undervoltage:
When the battery voltage is below
the EDVF threshold, the requested charge current is
set to the EDVF rate stored in EE0x5a/0x5b. Once
the voltage is above EDVF, the requested charge
current is set to the fast or maintenance rate
depending on the state of the LTF bit.
Count Compensations
Charge activity is compensated for temperature and
state-of-charge before updating the RM and/or DCR.
Self-discharge estimation is compensated for tempera-
ture before updating RM or DCR.
Charge Compensation
Charge efficiency is compensated for state-of-charge,
temperature, and battery chemistry.
ciency is adjusted using the following equations:
The charge effi-
1.)RM
RM *
Q
(
Q
EFC
ET
=
)
where RelativeStateOfCharge < FullChargePercentage,
and Q
is the programmed fast-charge efficiency vary-
ing from 0.75 to 1.0.
2.)RM
RM
Q
Q
ETC
ET
=
* (
)
where RelativeStateOfCharge
≥
FullChargePercentage
and Q
is the programmed maintenance (trickle)
charge efficiency varying from 0.75 to 1.0.
Q
is used to adjust the charge efficiency as the battery
temperature increases according to the following:
Q
if T
ET
=
<
0
30
°
C
Q
C
T
C
ET
=
°
≤
<
°
002
.
30
40
if
Q
T
C
ET
=
≥
°
005
.
40
if
Q
ET
is 0 over the entire temperature range for Li-Ion.
Digital Magnitude Filter
The bq2040 has a programmable digital filter to elimi-
nate charge and discharge counting below a set
threshold, V
SRD
. Table 2 shows typical digital filter
settings. The proper digital filter setting can be calcu-
lated using the following equation.
DMF =
45
V
SRD
9
bq2040
DMF
DMF Hex.
V
SRD
(mV)
75
4B
0.60
0.45
0.30
0.26
0.23
100
150
175
200
64
96
AF
C8
Table 2. Typical Digital Filter Settings
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| BQ2040EVM-001 | 功能描述:電源管理IC開發(fā)工具 Eval Kit for NiMH 10.8V RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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| BQ2040SN | 制造商:Texas Instruments 功能描述:BATTERY CHARGE MONITOR SMD 2040 |
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