參數(shù)資料
型號(hào)： bq2014H
廠商： Benchmark Technology Group
英文描述： Low-Cost NiCd/NiMH Gas Gauge IC(低價(jià)格NiCd/NiMHGas Gauge芯片)
中文描述： 低成本鎳鎘/鎳氫電池電量監(jiān)測(cè)計(jì)芯片（低價(jià)格鎳鎘/ NiMHGas計(jì)芯片）
文件頁(yè)數(shù)： 4/22頁(yè)
文件大小： 185K
代理商： BQ2014H
Voltage Thresholds
In conjunction with monitoring V
SR
for charge/discharge
currents, the bq2014H monitors the battery potential
through the SB pin for the end-of-discharge voltage (EDV)
thresholds.
The EDV threshold levels are used to determine when
the battery has reached an “empty”state.
The EDV thresholds for the bq2014H are programmable
with the default values fixed as follows:
EDV1 (first) = 0.76V
EDVF (final) = EDV1 - 0.025V = 0.735V
The battery voltage divider (RB1 and RB2 in Figure 1) is
used to scale these values to the desired threshold.
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.
EDV monitoring is disabled if the discharge rate is
greater than 2C (OVLD Flag = 1) and resumes
12
second
after the rate falls below 2C. The V
SB
value is available
over the serial port.
RBI Input
The RBI input pin is used with a storage capacitor or ex-
ternal supply to provide backup potential to the internal
bq2014H registers when V
CC
drops below 3.0V. V
CC
is
output on RBI when V
CC
is above 3.0V. If using an exter-
nal supply (such as the bottom series cell) as the backup
source,anexternaldiodeisrequiredforisolation.
Reset
The bq2014H can be reset by removing V
CC
and ground-
ing the RBI pin for 15 seconds or by commands over the
serial port. The serial port reset command sequence re-
quires writing 00h to register PPFC (address = 1Eh) and
then writing 00h to register LMD (address = 05h).
Temperature
The bq2014H internally determines the temperature in
10°C steps centered from approximately -35°C to +85°C.
The temperature steps are used to adapt charge and dis-
charge rate compensations, self-discharge counting, and
available charge display translation.
The temperature range is available over the serial port
in 10°C increments,as shown in the following table
Layout Considerations
The bq2014H 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:
I
The capacitors (C1 and C2) should be placed as
close
as
possible
to
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
V
CC
and
SB
pins,
I
The sense-resistor capacitor should be placed as close
as possible to the SR pin.
I
The sense resistor (R
S
) should be as close as possible to
the bq2014H.
4
TMP (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
bq2014H
Preliminary
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
BQ2014HEVM-001 功能描述:電源管理IC開發(fā)工具 BQ2014H Eval Kit for NiMH 10.8V RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
BQ2014HSN 功能描述:電池管理 NiCd/NiMH 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
BQ2014HSN-A309 制造商:TI 制造商全稱:Texas Instruments 功能描述:Low-Cost NiCd/NiMH Gas Gauge IC
BQ2014HSNG4 功能描述:電池管理 NiCd/NiMH 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
BQ2014HSNTR 功能描述:電池管理 NiCd/NiMH 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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