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參數資料
| 型號： | LTC4150CMS |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 模擬信號調理 |
| 英文描述： | Coulomb Counter/ Battery Gas Gauge |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO10 |
| 封裝： | PLASTIC, MSOP-10 |
| 文件頁數： | 8/12頁 |
| 文件大?。?/td> | 136K |
| 代理商： | LTC4150CMS |
LTC4150
8
4150fa
INT, POL and CLR
INT asserts low each time the LTC4150 measures a unit of
charge. At the same time, POL is latched to indicate the
polarity of the charge unit. The integrator and counter
continue running, so the microcontroller must service and
clear the interrupt before another unit of charge accumu-
lates. Otherwise, one measurement will be lost. The time
available between interrupts is the reciprocal of
Equation 2:
TimeperINT Assertion
G
V
VF
SENSE
=
1
(9)
At 50mV full scale, the minimum time available is 596ms.
To be conservative and accommodate for small, unex-
pected excursions above the 50mV sense voltage limit, the
microcontroller should process the interrupt and polarity
information and clear INT within 500ms.
Toggling CLR low for at least 20
μ
s resets INT high and
unlatches POL. Since the LTC4150’s integrator and counter
operate independently of the INT and POL latches, no
charge information is lost during the latched period or
while CLR is low. Charge/discharge information continues
to accumulate during those intervals and accuracy is
unaffected.
Once cleared, INT idles in a high state and POL indicates
real-time polarity of the battery current. POL high indi-
cates charge flowing into the battery and low indicates
charge flowing out. Indication of a polarity change re-
quires at least:
t
G
V
POL
VF
SENSE
=
2
1024
(10)
where V
SENSE
is the smallest sense voltage magnitude
before and after the polarity change.
Open-drain outputs POL and INT can sink I
OL
= 1.6mA at
V
OL
= 0.5V. The minimum pull-up resistance for these pins
should be:
R
L
> (V
CC
– 0.5) / 1.6mA
where V
CC
is the logic supply voltage. Because speed isn’t
an issue, pull-up resistors of 10k or higher are adequate.
(11)
APPLICATIU
W
U
U
Interfacing to INT, POL, CLR and SHDN
The LTC4150 operates directly from the battery, while in
most cases the microcontroller supply comes from some
separate, regulated source. This poses no problem for INT
and POL because they are open-drain outputs and can be
pulled up to any voltage 9V or less, regardless of the
voltage applied to the LTC4150’s V
DD
.
CLR and SHDN inputs require special attention. To drive
them, the microcontroller or external logic must generate
a minimum logic high level of 1.9V. The maximum input
level for these pins is V
DD
+ 0.3V. If the microcontroller’s
supply is more than this, resistive dividers must be used
on CLR and SHDN. The schematic in Figure 6 shows an
application with INT driving CLR and microcontroller V
CC
> V
DD
. The resistive dividers on CLR and SHDN keep the
voltages at these pins within the LTC4150’s V
DD
range.
Choose R2 and R1 so that:
(R1 + R2)
≥
50R
L
(12)
1 9
.
1
R
1
2
(
)
V
R
+
R
V
V
Minimum
CC
DD
≤
≤
(13)
Equation 13 also applies to the selection of R3 and R4. The
minimum V
DD
is the lowest supply to the LTC4150 when
the battery powering it is at its lowest discharged voltage.
When the battery is removed in any application, the CLR
and SHDN inputs are unpredictable. INT and POL outputs
may be erratic and should be ignored until after the battery
is replaced.
If desired, the simple logic of Figure 4 may be used to
derive separate charge and discharge pulse trains from
INT and POL.
Figure 4. Unravelling Polarity—
Separate Charge and Discharge Outputs
INT
CLR
CHARGE
DISCHARGE
POL
LTC4150
4150 F04
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LTC4150CMS#PBF | 功能描述:IC COUNTER/GAUGE GAS/BATT 10MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 其它有關文件:STC3100 View All Specifications 特色產品:STC3100 - Battery Monitor IC 標準包裝:4,000 系列:- 功能:燃料，電量檢測計/監(jiān)控器 電池化學:鋰離子（Li-Ion） 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:8-MiniSO 包裝:帶卷 (TR) 其它名稱:497-10526-2 |
| LTC4150CMS#PBF | 制造商:Linear Technology 功能描述:Battery Management IC |
| LTC4150CMS#TR | 功能描述:IC COUNTER/BATT GAS GAUGE 10MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標準包裝:61 系列:- 功能:電源管理 電池化學:鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應商設備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
| LTC4150CMS#TRPBF | 功能描述:IC COUNTER/GAUGE GAS/BATT 10MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標準包裝:61 系列:- 功能:電源管理 電池化學:鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應商設備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
| LTC4150CMSPBF | 制造商:Linear Technology 功能描述:Gas Gauge Li-Ion/NiCD/NiMH MSOP10 |
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