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参数资料
| 型号： | DS2780G+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/31页 |
| 文件大小： | 0K |
| 描述： | IC FUEL GAUGE STAND ALONE 10TDFN |
| 产品培训模块： | 1-Wire Communications Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 75 |
| 功能： | 燃料，电量检测计/监控器 |
| 电池化学： | 锂离子（Li-Ion）、锂聚合物（Li-Pol） |
| 电源电压： | 2.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 供应商设备封装： | 10-TDFN-EP（3x4） |
| 包装： | 管件 |
| 产品目录页面： | 1436 (CN2011-ZH PDF) |
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DS2780 Standalone Fuel Gauge IC
Sense Resistor Prime (RSNSP[1/ ?? ): RSNSP stores the value of the sense resistor for use in computing the
absolute capacity results. The resistance is stored as a 1-byte conductance value with units of mhos (1/ ?? . RSNSP
supports resistor values of 1 ? to 3.922m ? . RSNSP is located in the Parameter EEPROM block.
RSNSP = 1/RSNS
(units of mhos; 1/ ??
1-byte value that has a range of 49.2% to 100%. The lsb is weighted at 0.78% (precisely 2 ). A value of 100% (128
Charge Voltage (VCHG): VCHG stores the charge voltage threshold used to detect a fully charged state. The
voltage is stored as a 1-byte value with units of 19.52mV and can range from 0V to 4.978V. VCHG should be set
marginally less than the cell voltage at the end of the charge cycle to ensure reliable charge termination detection.
VCHG is located in the Parameter EEPROM block.
Minimum Charge Current (IMIN): IMIN stores the charge current threshold used to detect a fully charged state. It
is stored as a 1-byte value with units of 50 ? V (IMIN * RSNS) and can range from 0 to 12.75mV. Assuming RSNS =
20m ? , IMIN can be programmed from 0mA to 637.5mA in 2.5mA steps. IMIN should be set marginally greater than
the charge current at the end of the charge cycle to ensure reliable charge termination detection. IMIN is located in
the Parameter EEPROM block.
Active Empty Voltage (VAE): VAE stores the voltage threshold used to detect the Active Empty Point. The value
is stored in 1-byte with units of 19.52mV and can range from 0V to 4.978V. VAE is located in the Parameter
EEPROM block. See the Cell Characteristics section for more information.
Active Empty Current (IAE): IAE stores the discharge current threshold used to detect the Active Empty Point.
The unsigned value represents the magnitude of the discharge current and is stored in 1-byte with units of 200 ? V.
It can range from 0 to 51.2mV. Assuming RSNS = 20m ? , IAE can be programmed from 0mA to 2550mA in 10mA
steps. IAE is located in the Parameter EEPROM block. See the Cell Characteristics section for more information.
Aging Capacity (AC): AC stores the rated cell capacity which is used to estimate the decrease in battery capacity
that occurs during normal use. The value is stored in 2-bytes in the same units as the ACR (6.25 ? Vh). When set to
the manufacturer’s rated cell capacity the Aging Estimation rate is approximately 2.4% per 100 cycles of equivalent
full capacity discharges. Partial discharge cycles are added to form equivalent full capacity discharges. The default
aging estimation results in 88% capacity after 500 equivalent cycles. The Aging Estimation rate can be adjusted by
setting the AC to a value other than the cell manufacturer’s rating. Setting AC to a lower value, accelerates the
Aging Estimation rate. Setting the AC to a higher value, retards the Aging Estimation rate. The AC is located in the
Parameter EEPROM block.
Age Scalar (AS): AS adjusts the cell capacity estimation results downward to compensate for aging. The AS is a
-7
decimal or 80h) represents an un-aged battery. A value of 95% is recommended as the starting AS value at the
time of pack manufacture to allow the learning of a larger capacity on batteries that have an initial capacity greater
than the rated cell capacity programmed in the cell characteristic table. The AS is modified by the Aging Estimation
introduced under Aging Capacity and by the Learn function. The host system has read and write access to the AS,
however caution should be exercised when writing it to ensure that the cumulative aging estimate is not over
written with an incorrect value. Usually, writing the AS by the host is not necessary because it is automatically
saved to EEPROM on a periodic basis by the DS2780. (See the Memory section for details.) The AS value stored
in EEPROM is recalled on power-up.
CAPACITY ESTIMATION UTILITY FUNCTIONS
Aging Estimation
As discussed above, the AS register value is adjusted occasionally based on cumulative discharge. As the ACR
register decrements during each discharge cycle, an internal counter is incremented until equal to 32 times the AC.
The AS is then decremented by one, resulting in a decrease in the scaled full battery capacity of 0.78%
(approximately 2.4% per 100 cycles). Refer to the AC register description above for recommendations on
customizing the age estimation rate.
Learn Function
Since Li+ cells exhibit charge efficiencies near unity, the charge delivered to a Li+ cell from a known empty point to
a known full point is a dependable measure of the cell capacity. A continuous charge from empty to full results in a
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2780G+ | 功能描述:电池管理 Stand-Alone Fuel Gauge RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| DS2780G+T&R | 制造商:Maxim Integrated Products 功能描述:STANDALONE FUELGAUGE 10-TDFN T&R LF - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC FUEL GAUGE STAND ALONE 10TDFN 制造商:Maxim Integrated Products 功能描述:Battery Management Stand-Alone Fuel Gauge |
| DS2780G+T&R | 功能描述:电池管理 Stand-Alone Fuel Gauge RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| DS2780G+TR | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Standalone Fuel Gauge IC |
| DS2780K | 功能描述:电源管理IC开发工具 RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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