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參數(shù)資料
| 型號： | LTC4150 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 通用總線功能 |
| 英文描述： | Coulomb Counter/ Battery Gas Gauge |
| 中文描述： | 庫侖計/電池電量計 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大?。?/td> | 136K |
| 代理商： | LTC4150 |
LTC4150
6
4150fa
OPERATIOU
Charge is the time integral of current. The LTC4150
measures battery current by monitoring the voltage devel-
oped across a sense resistor and then integrates this
information in several stages to infer charge. The Block
Diagram shows the stages described below. As each unit
of charge passes into or out of the battery, the LTC4150
INT pin interrupts an external microcontroller and the POL
pin reports the polarity of the charge unit. The external
microcontroller then resets INT with the CLR input in
preparation for the next interrupt issued by the LTC4150.
The value of each charge unit is determined by the sense
resistor value and the sense voltage to interupt frequency
gain G
VF
of the LTC4150.
Power-On and Start-Up Initialization
When power is first applied to the LTC4150, all internal
circuitry is reset. After an initialization interval, the LTC4150
begins counting charge. This interval depends on V
DD
and
the voltage across the sense resistor but will be at least
5ms. It may take an additional 80ms for the LTC4150 to
accurately track the sense voltage. An internal undervolt-
age lockout circuit monitors V
DD
and resets all circuitry
when V
DD
falls below 2.5V.
Asserting SHDN low also resets the LTC4150’s internal
circuitry and reduces the supply current to 1.5
μ
A. In this
condition, POL and INT outputs are high impedance. The
LTC4150 resumes counting after another initialization
interval. Shutdown minimizes battery drain when both the
charger and load are off.
CHARGE COUNTING
First, the current measurement is filtered by capacitor C
F
connected across pins C
F+
and C
F–
. This averages fast
changes in current arising from ripple, noise and spikes in
the load or charging current.
Second, the filter’s output is applied to an integrator with
the amplifier and 100pF capacitor at its core. When the
integrator output ramps to REFHI or REFLO levels, switches
S1 and S2 reverse the ramp direction. By observing the
condition of S1 and S2 and the ramp direction, polarity is
determined. The integrating interval is trimmed to 600
μ
s
at 50mV full-scale sense voltage.
Third, a counter is incremented or decremented every time
the integrator changes ramp direction. The counter effec-
tively increases integration time by a factor of 1024,
greatly reducing microcontroller overhead required to
service interrupts from the LTC4150.
At each counter under or overflow, the INT output latches
low, flagging a microcontroller. Simultaneously, the POL
output is latched to indicate the polarity of the observed
charge. With this information, the microcontroller can
total the charge over long periods of time, developing an
accurate estimate of the battery’s condition. Once the
interrupt is recognized, the microcontroller resets INT
with a low going pulse on CLR and awaits the next
interrupt. Alternatively, INT can drive CLR.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC4150IMS | Coulomb Counter/ Battery Gas Gauge |
| LTC4210-2IS6 | Microprocessor Crystal; Frequency:32.768MHz; Frequency Tolerance:20ppm; Load Capacitance:18pF; Crystal Terminals:Radial Leaded; ESR:25ohm; Leaded Process Compatible:Yes; Mounting Type:Through Hole; No. of Pins:2 RoHS Compliant: Yes |
| LTC4210-1IS6 | Hot Swap Controller in 6-Lead SOT-23 Package |
| LTC4210-2CS6 | Hot Swap Controller in 6-Lead SOT-23 Package |
| LTC4210-1 | Hot Swap Controller in 6-Lead SOT-23 Package |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC4150_1 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Coulomb Counter/ Battery Gas Gauge |
| LTC4150CMS | 功能描述:IC COUNTER/GAUGE GAS/BATT 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(xué):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(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
| 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(guān)文件:STC3100 View All Specifications 特色產(chǎn)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(xué):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(yīng)商設(shè)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(xué):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(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
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