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参数资料
| 型号： | DS2786BG+T&R |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| 封装： | 3 X 3 MM, ROHS COMPLIANT, TDFN-10 |
| 文件页数： | 6/21页 |
| 文件大小： | 363K |
| 代理商： | DS2786BG+T&R |
DS2786B
Stand-Alone OCV-Based Fuel Gauge
14
______________________________________________________________________________________
MSB—EVEN ADDRESSES 68h–78h
LSB—ODD ADDRESS 69h–79h
2
11
2
10
2
9
2
8
2
7
2
6
2
5
2
4
2
3
2
1
2
0
X
MSB
LSB
MSB
LSB
“X”: RESERVED
UNITS: 1.22mV
Figure 17. Voltage Breakpoint Register Format
MSB—ADDRESS 14h
LSB—ADDRESS 15h
S
2
11
2
10
2
9
2
8
2
7
2
6
2
5
2
4
2
3
2
1
2
0
X
MSB
LSB
MSB
LSB
“S”: SIGN BIT, “X”: RESERVED
UNITS: 1.22mV
Figure 18. Initial Voltage Register Format
ADDRESS 16h
2
7
2
6
2
5
2
4
2
3
2
1
2
0
MSB
LSB
UNITS: 0.5%
Figure 19. Last OCV Register Format
Initial Capacity Estimation
The DS2786B calculates relative capacity immediately
upon power-up. During initialization, the DS2786B
makes a voltage measurement and uses the OCV cell
model data to determine a starting point for the Relative
Capacity Register. This estimation occurs regardless of
the load on the cell. Any error induced from cell loading
is removed at the next OCV adjustment. The initial volt-
age measurement used in determining the starting
point is stored in the Initial Voltage Register until the IC
is power cycled. See Figure 18.
New Capacity Learning
As the cell ages, the Initial Capacity Scaling Factor
Register value might no longer accurately reflect the
true capacity of the cell, causing error in relative capaci-
ty calculation while in coulomb-counting mode of opera-
tion. The DS2786B has a learn feature that allows the IC
to remain accurate as the cell changes. The DS2786B
compares the percent relative capacity difference
between the last two OCV updates to the change in the
coulomb count to learn the new cell capacity. The Last
OCV Register maintains the relative capacity percent-
age at the previous OCV adjustment point used for
learning the new cell capacity. The last OCV is updated
with a new value at each OCV adjustment. Figure 19
shows the Last OCV Register format.
Example: Assuming a 15m
Ω sense resistor, the
DS2786B adjusts the relative capacity of a 1000mAh
cell to 10% based on an OCV measurement during an
idle period of the application. The cell is then charged
by 500mAh (to 60% expected) based on the internal
coulomb count multiplied by the learned capacity scal-
ing factor value of 55h. The next OCV adjustment deter-
mines the relative capacity should actually be at 65%,
not 60%. The DS2786B then adjusts the learned capac-
ity scaling factor value upward to (65% - 10%)/(500mAh
x 0.015
Ω) = 5Eh, lowering the expected cell capacity
by approximately 10%.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2786BK | 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 |
| DS2786G+ | 功能描述:电池管理 Stand-Alone OCV Based 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 |
| DS2786G+T&R | 制造商:Maxim Integrated Products 功能描述:STAND ALONE OCV BASED FUEL GAUGE LF - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC FUEL GAUGE OCV 10-TDFN 制造商:Maxim Integrated Products 功能描述:FUEL GAUGE STANDALONE OCV TDFN-10 制造商:Maxim Integrated Products 功能描述:FUEL GAUGE STANDALONE OCV, TDFN-10 |
| DS2786G+T&R | 功能描述:电池管理 Stand-Alone OCV Based 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 |
| DS2786G+TR | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Stand-Alone OCV-Based Fuel Gauge |
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