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參數(shù)資料
| 型號： | 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IC一樣，帶有SMBus接口（電量監(jiān)測計芯片（帶的SMBus接口）） |
| 文件頁數(shù)： | 8/28頁 |
| 文件大?。?/td> | 213K |
| 代理商： | BQ2092 |
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in full charge percentage, RM is set to full charge
percentage of FCC on valid charge termination. If RM is
above the full charge percentage, RM is not modified.
Count Compensations
Charge activity is compensated for temperature and
state-of-charge before updating the RM and/or DCR. RM
is compensated for temperature before updating the RM
register.
Self-discharge estimation is compensated for
temperature before updating RM or DCR.
Charge Compensation
Charge efficiency is compensated for state-of-charge,
temperature, and battery chemistry. For Li-Ion chemis-
try cells, the charge efficiency is unity for all cases. The
charge efficiency for nickel chemistry cells, however, is
adjusted using the following equation:
RM
RM
Q
(
Q
EFC
ET
=
)
whereRelativeStateofCharge
FullChargePercentage
≤
and Q
is the programmed fast charge efficiency vary-
ing from .75 to .99.
RM
RM
Q
(
Q
ETC
ET
≥
=
)
whereRelativeStateofCharge
FullChargePercentage
and Q
is the programmed maintenance (trickle)
charge efficiency varying from 0.50 to 0.97.
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
Remaining Capacity Compensation
The bq2092 adjusts the RM as a function of tempera-
ture. This adjustment accounts for the reduced capacity
of the battery at colder temperatures. The following
equation is used to adjust RM:
If T
C
≥
°
5
RemainingCapacity
Nominal Available Capacity (NAC)
=
If T < 5°C
RM()
NAC()
TCC
T
5 C))
=
+
(
(
1
Where T = temperature
°
C
TCC = 0.004
RM adjusts upward to Nominal Available Capacity as
the temperature increases.
Digital Magnitude Filter
The bq2092 has a programmable digital filter to elimi-
nate charge and discharge counting below a set
threshold. Table 2 shows typical digital filter settings.
The proper digital filter setting can be calculated
using the following equation.
|V
SRD
(mV)| = 45 / DMF
Error Summary
Capacity Inaccurate
The FCC is susceptible to error on initialization or if no
updates occur. On initialization, the FCC value includes
the error between the design capacity and the actual
capacity. This error is present until a valid discharge
occurs and FCC is updated (see the DCR description on
page 6). The other cause of FCC error is battery wear-
out. As the battery ages, the measured capacity must be
adjusted to account for changes in actual battery capac-
ity.
Periodic discharges from full to empty will mini-
mize errors in FCC.
Current-Sensing Error
Table 3 illustrates the current-sensing error as a func-
tion of V
SR
.
A digital filter eliminates charge and
discharge counts to the RM register when V
SRO
is
between V
SRQ
and V
SRD
.
Display
The bq2092 can directly display capacity information
using low-power LEDs. The bq2092 displays the battery
charge state in either absolute or relative mode. In rela-
tive mode, the battery charge is represented as a
percentage of the FCC. Each LED segment represents
25% of the FCC.
8
bq2092
DMF
DMF
Hex.
|V
SRD
(mV)|
±
0.60
±0.45
±0.30
±0.26
±0.23
75
4B
100
64
96
AF
C8
150 (default)
175
200
Table 2. Typical Digital Filter Settings
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| BQ2092SN | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Gas Gauge IC with SMBus-Like Interface |
| BQ2092SN-A309 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| BQ2092SN-A309TR | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
| BQ2092SN-A311 | 功能描述:電池管理 Multi-Chemistry Gas Gauge RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| BQ2092SN-A311G4 | 功能描述:電池管理 Multi-Chem SBS 0.95 Compl Gas Gauge RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
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