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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： | 4/21页 |
| 文件大小： | 363K |
| 代理商： | DS2786BG+T&R |
DS2786B
Stand-Alone OCV-Based Fuel Gauge
12
______________________________________________________________________________________
Prior to the first learn operation, the relative capacity
value is calculated by adding the IACR multiplied by the
initial capacity scaling factor (7Ah) to the last OCV rela-
tive capacity (16h). After the first learn operation, the rel-
ative capacity value is calculated by adding the IACR
multiplied by the learned capacity scaling factor (17h) to
the last OCV relative capacity (16h).
Each Capacity Scaling Factor Register has a resolution
of 78.125%/Vh and a maximum range of 0 to
19921.875%/Vh. During assembly, the Initial Capacity
Register should be programmed to the capacity of the
cell. For example, an application using a 1Ah cell and
0.015
Ω sense resistor would set the Initial Capacity
Register to a value of (100%/(1Ah x 0.015
Ω))/
78.125%/Vh = 55h. The Learned Capacity Scaling Factor
Register is controlled by the DS2786B. The power-up
value is 00h, and the register is updated with the calcu-
lated new cell capacity value after every learn operation.
See Figures 11 and 12.
OCV Detection
When the magnitude of the measured current (after
COBR is applied) is less than the value defined by the
OCV Threshold Register, the DS2786B begins dV/dt
measurement evaluation to detect an OCV voltage
condition. A threshold value that is below the minimum
operational current, but above the maximum idle cur-
rent of the application should be selected. The OCV
Threshold Register has a resolution of 25V/RSNS, and
a range from 0mV/RSNS to 6.375mV/RSNS. The factory
default value is 28h. See Figure 13 for the OCV thresh-
old register format.
While the measured current is below the OCV threshold
level, the DS2786B actively searches for a relaxed cell
by calculating the change in cell voltage as reported in
the Voltage Register over 7.5min intervals (dV/dt). If the
7.5min dV/dt change of an average of four Voltage
Register readings is less than the value stored in the
OCV dV/dt Threshold Register, the DS2786B deter-
mines that the cell is now in a relaxed state and the
Relative Capacity Register is adjusted based on the
OCV cell model stored in parameter EEPROM. This
operation occurs repeatedly every 7.5min up to 1hr
after the cell enters a relaxed state.
The OCV dV/dt Threshold Register has a resolution of
0.61mV/7.5min and a range from 0mV/7.5min to
9.15mV/7.5min. The factory default value is
2.44mV/7.5min. Note that the upper 4 bits of the OCV
dV/dt Threshold Register are used to EEPROM back
bits from the Status/Configuration Register. Figure 14
shows the OCV dV/dt threshold register format.
ADDRESS 7Ah
2
7
2
6
2
5
2
4
2
3
2
1
2
0
MSB
LSB
UNITS: 78.125%/Vh
Figure 11. Initial Capacity Scaling Factor Register Format
ADDRESS 17h
2
7
2
6
2
5
2
4
2
3
2
1
2
0
MSB
LSB
UNITS: 78.125%/Vh
Figure 12. Learned Capacity Scaling Factor Register Format
ADDRESS 7Bh
2
7
2
6
2
5
2
4
2
3
2
1
2
0
MSB
LSB
UNITS: 25μV/RSNS
Figure 13. OCV Threshold Register Format
ADDRESS 7Ch
SMOD
LDIS
VODIS ITEMP
2
3
2
1
2
0
MSB
LSB
UNITS: 0.61mV/7.5min
Figure 14. OCV dV/dt Threshold Register Format
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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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