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参数资料
| 型号： | DS2784G+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 21/43页 |
| 文件大小： | 0K |
| 描述： | IC FUEL GAUGE STND-ALONE 14-TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 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 ~ 4.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-WFDFN 裸露焊盘 |
| 供应商设备封装： | 14-TDFN-EP（3x5） |
| 包装： | 带卷 (TR) |
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DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication
CAPACITY ESTIMATION ALGORITHM
Remaining capacity estimation uses real-time measured values, stored parameters describing the cell
characteristics, and application operating limits. Figure 3 describes the algorithm inputs and outputs.
Figure 3. Top-Level Algorithm Diagram
Voltage
(R)
FULL(T)
(R)
Temperature
Current
(R)
(R)
Capacity Look-up
Available Capacity Calculation
Active Empty (T)
(R)
Accumulated
Current (ACR) (R/W)
Average Current (R)
Cell
Model
Parameters
(EEPROM)
Aging Cap (AC)
(2 bytes EE)
Age Scalar (AS)
(1 bytes EE)
ACR Housekeeping
Age Estimator
Learn Function
Standby Empty (T) (R)
Remaining Active Absolute
Capacity (RAAC) mAh (R)
Remaining Standby Absolute
Capacity (RSAC) mAh (R)
Remaining Active Relative
Capacity (RARC) % (R)
Remaining Standby Relative
Capacity (RSRC) % (R)
User Memory (EEPROM)
16 bytes
Sense Resistor’
(RSNSP) (1byte EE)
Charge Voltage
(VCHG) (1 byte EE)
Min Chg Current
(IMIN) (1 byte EE)
Empty Voltage
(VAE) (1 byte EE)
Empty Current (IAE)
(1 byte EE)
MODELING CELL CHARACTERISTICS
To achieve reasonable accuracy in estimating remaining capacity, the cell performance characteristics
overtemperature, load current, and charge-termination point must be considered. Since the behavior of Li+ cells is
nonlinear, these characteristics must be included in the capacity estimation to achieve an acceptable level of
accuracy in the capacity estimation. The FuelPack? method used in the DS2784 is described in general in
Application Note 131: Lithium-Ion Cell Fuel Gauging with Maxim Battery Monitor ICs. To facilitate efficient
implementation in hardware, a modified version of the method outlined in AN131 is used to store cell characteristics
in the DS2784. Full and empty points are retrieved in a lookup process which retraces a piece-wise linear model
consisting of three model curves named full, active empty, and standby empty. Each model curve is constructed
with 5-line segments, numbered 1 through 5. Above 40°C, the segment 5 model curves extend infinitely with zero
slope, approximating the nearly flat change in capacity of Li+ cells at temperatures above 40°C. Segment 4 of each
model curves originates at +40°C on its upper end and extends downward in temperature to the junction with
segment 3. Segment 3 joins with segment 2, which in turn joins with segment 1. Segment 1 of each model curve
extends from the junction with segment 2 to infinitely colder temperatures. The three junctions or breakpoints that
join the segments (labeled TBP12, TBP23, and TBP34 in Figure 4) are programmable in 1°C increments from -
128°C to +40°C. The slope or derivative for segments 1, 2, 3, and 4 are also programmable over a range of 0 to
15,555ppm, in steps of 61ppm.
FuelPack is a trademark of Maxim Integrated Products, Inc.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2784K | 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 |
| DS2786 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Standalone OCV-Based Fuel Gauge |
| DS2786_09 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Stand-Alone OCV-Based Fuel Gauge |
| DS2786B | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Stand-Alone OCV-Based Fuel Gauge |
| DS2786BEVKIT+ | 制造商:Maxim Integrated Products 功能描述:STANDALONE OCV-BASED FUEL GAUGE - Boxed Product (Development Kits) |
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