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| 型号： | DS2781E+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/31页 |
| 文件大小： | 0K |
| 描述： | IC FUEL GAUGE BATT 8TSSOP |
| 产品培训模块： | 1-Wire Communications Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 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 ~ 10 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 8-TSSOP |
| 包装： | 管件 |
| 产品目录页面： | 1436 (CN2011-ZH PDF) |
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DS2781
Active Empty: The Active Empty curve defines the temperature variation in the empty point of the discharge profile
based on a high level load current (one that is sustained during a high power operating mode) and the minimum
voltage required for system operation. This load current is programmed as the Active Empty current (IAE), and
should be a 3.5s average value to correspond to values read from the Current register, and the specified minimum
voltage, or Active Empty voltage (VAE) should be a 250ms average to correspond to values read from the Voltage
register. The DS2781 reconstructs the Active Empty line from cell characteristic table values to determine the
Active Empty capacity of the battery at each temperature. Reconstruction occurs in one-degree temperature
increments. Active Empty segment slopes are stored the same as described for the Full segments above.
Standby Empty: The Standby Empty curve defines the temperature variation in the empty point in the discharge
defined by the application standby current and the minimum voltage required for standby operation. Standby Empty
represents the point that the battery can no longer support a subset of the full application operation, such as
memory data retention or organizer functions on a wireless handset. Standby Empty segment slopes are stored the
same as described for the Full segments above.
The standby load current and voltage are used for determining the cell characteristics but are not programmed into
the DS2781. The DS2781 reconstructs the Standby Empty line from cell characteristic table values to determine
the Standby Empty capacity of the battery at each temperature. Reconstruction occurs in one-degree temperature
increments.
CELL STACK MODEL CONSTRUCTION
The model is constructed with all points normalized to the fully charged state at +40°C. Initial values, the +40°C
Full value in mVh units and the +40°C Active Empty value as a fraction of the +40°C Full are stored in the cell
parameter EEPROM block. Standby Empty at +40°C is by definition zero and therefore no storage is required. The
slopes (derivatives) of the 4 segments for each model curve are also stored in the cell parameter EEPROM block
along with the break point temperatures of each segment. An example of data stored in this manner is shown in
Table 1.
Table 1. Example Cell Characterization Table (Normalized to +40°C)
Manufacturers Rated Cell Capacity: 1000mAh
Charge Voltage: 8.4V Charge Current: 500mA Termination Current: 50mA
Active Empty (V, I): 6.0V, 300mA
Sense Resistor: 0.020 Ω
Standby Empty (V, I): 6.0V, 4mA
TBP12
TBP23
TBP34
Segment
Break Points
-12oC
0oC
18oC
+40 ° C
Nominal
[mAh]
Seg. 1
ppm/ ° C
Seg. 2
ppm/ ° C
Seg. 3
ppm/ ° C
Seg. 4
ppm/ ° C
Full
Active Empty
Standby Empty
1051
3601
2380
1404
3113
1099
427
1163
671
244
854
305
183
Figure 13. Lookup Function Diagram
Cell Model
Parameters
Look-up
FULL(T)
(EEPROM)
Temperature
Function
14 of 31
AE(T)
SE(T)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2781E+ | 功能描述:电池管理 1-2 Cell 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 |
| DS2781E+T&R | 制造商:Maxim Integrated Products 功能描述:FUEL GAUGE 制造商:Maxim Integrated Products 功能描述:STANDALONE FUEL GAUGE IC 8TSSOP - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC FUEL GAUGE BATT 8TSSOP |
| DS2781E+T&R | 功能描述:电池管理 1-2 Cell 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 |
| DS2781E+TR | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:1-Cell or 2-Cell Standalone Fuel Gauge IC |
| DS2781E-C1+T&R | 功能描述:电池管理 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 |
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