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| 型号： | DS2438AZ+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/29页 |
| 文件大小： | 0K |
| 描述： | IC MONITOR SMART BATTERY 8-SOIC |
| 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： | 智能电池 |
| 电源电压： | 2.4 V ~ 10 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
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DS2438
OPERATION - CURRENT ACCUMULATORS
The DS2438 tracks the remaining capacity of a battery using the Integrated Current Accumulator (ICA).
The ICA maintains a net accumulated total of current flowing into and out of the battery; therefore, the
value stored in this register is an indication of the remaining capacity in a battery and may be used in
performing fuel gauge functions. In addition, the DS2438 has another register that accumulates only
charging (positive) current (CCA) and one that accumulates only discharging (negative) current (DCA).
The CCA and DCA give the host system the information needed to determine the end of life of a
rechargeable battery, based on total charge/discharge current over its lifetime.
The current measurement described above yields the voltage across sense resistor R SENS measured every
27.46 ms. This value is then used to increment or decrement the ICA register, increment the CCA (if
current is positive), or increment the DCA (if current is negative). The ICA is a scaled 8-bit volatile
binary counter that integrates the voltage across R SENS over time. The ICA is only
incremented/decremented if the IAD bit is set to 1 in the Status/Configuration Register. Table 5 illustrates
the contents of the ICA. See Memory Map section for the address location of the ICA.
ICA REGISTER FORMAT Table 5
(This register accumulates the voltage measured across current sense resistor R SENS . This
value can be used to calculate remaining battery capacity using the equation below.)
2 7
2 6
2 5
2 4
2 3
2 2
2 1
2 0
MSb
(unit = 0.4882 mVhr)
LSb
Remaining battery capacity is calculated from the ICA value using the equation:
Remaining Capacity = ICA / (2048 * R SENS )
(where R SENS is in W )
For example, if a battery pack has 0.625 Ahr of remaining capacity, and the pack uses a 0.025 W sense
resistor, the ICA will contain the value 32. From this value, remaining capacity can be calculated to be:
Remaining Capacity = 32 / ( 2048 * 0.025) = 0.625 Ahr
Since the accuracy of the current ADC is +2 LSb, measurements of very small currents can be inaccurate
by a high percentage. Because these inaccuracies can turn into large ICA errors when accumulated over a
long period of time, the DS2438 provides a method for filtering out potentially erroneous small signals so
that they are not accumulated. The DS2438’s Threshold Register specifies a current measurement
magnitude (after offset cancellation) above which the measurement is accumulated in the ICA, CCA and
DCA and below which it is not accumulated. The format of the Threshold Register is shown in Table 6.
The power-on default Threshold Register value is 00h (no threshold).
NOTE:
When writing to the Threshold Register, current measurement must be disabled (IAD bit set to “0”).
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相关代理商/技术参数 |
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|---|---|
| DS2438EVKIT+ | 制造商:Maxim Integrated Products 功能描述:DS2438 DEMO KIT |
| DS2438K | 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 |
| DS2438Z | 功能描述:IC MONITOR SMART BATTERY 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:1 系列:- 功能:充电管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:3.75 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:剪切带 (CT) 产品目录页面:669 (CN2011-ZH PDF) 其它名称:MCP73831T-2ACI/OTCT |
| DS2438Z/T&R | 制造商:Maxim Integrated Products 功能描述:SMART BATTERY MONITOR 8-SOIC T&R - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC MONITOR SMART BATTERY 8-SOIC |
| DS2438Z/T&R | 功能描述:IC MONITOR SMART BATTERY 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:1 系列:- 功能:充电管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:3.75 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:剪切带 (CT) 产品目录页面:669 (CN2011-ZH PDF) 其它名称:MCP73831T-2ACI/OTCT |
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