參數(shù)資料
型號： DS2438Z
英文描述： Smart Battery Monitor
中文描述： 智能電池監(jiān)視器
文件頁數(shù)： 9/29頁
文件大?。?/td> 351K
代理商： DS2438Z
DS2438
9 of 29
Figure 2 illustrates the activity of the ICA, CCA, and DCA over a sample charge/discharge cycle of a
battery pack, assuming the DS2438 is configured for the ICA to function and the CCA/DCA to function
and shadow data to EEPROM. To simplify the illustration of the accumulators, they are treated as analog
values, although they are digital counters in the DS2438. Note that when the battery becomes fully
discharged, i.e., the ICA value reaches 0, the CCA and DCA register values are maintained.
CURRENT ACCUMULATOR ACTIVITY
Figure 2
SENSE RESISTOR SELECTION
The selection of R
SENS
involves a tradeoff. On the one hand, the impedance of R
SENS
must be minimized
to avoid excessive voltage drop during peak current demands. On the other hand, the impedance of R
SENS
should be maximized to achieve the finest resolution for current measurement and accumulation. Table 9
below lists several example R
SENS
values, the voltage drop across R
SENS
at 2A (as an example), the LSb of
the current calculation ( 1/(4096 * R
SENS
) ) and the LSb of the remaining capacity calculation ( 1/(2048 *
R
SENS
) ). The user should carefully consider voltage drop at maximum current and required current
measurement/accumulation resolution when selecting R
SENS
.
SENSE RESISTOR TRADEOFFS
Table 9
SENSE RESISTOR
VALUE (R
SENS
)
V
SENS
AT I=2A
25 m
50 m
100 m
200 m
CURRENT lsb
9.76 mA
4.88 mA
REMAINING
CAPACITY lsb
19.53 mAHr
9.76 mAHr
MAX REMAINING
CAPACITY VALUE
5000 mAhr
2500 mAhr
50 mV
100 mV
200 mV
400 mV
2.44 mA
1.22 mA
4.88 mAHr
2.44 mAHr
1250 mAhr
625 mAhr
OPERATION - ELAPSED TIME METER
An internal oscillator is used as the timebase for the timekeeping functions. The elapsed time functions
are double buffered, allowing the master to read elapsed time without the data changing while it is being
read. To accomplish this, a snapshot of the counter data is transferred to holding registers which the user
accesses. This occurs after the 8th bit of the Recall Memory command.
The elapsed time meter (ETM) is a 4-byte binary counter with 1-second resolution. The ETM can
accumulate 136 years of seconds before rolling over. Time/date is represented by the number of seconds
since a reference point, which is determined by the user. For example, 12:00 A.M., January 1, 1970 could
be used as a reference point.
相關PDF資料
PDF描述
DS2442 Battery Management
DS2501 1A VERY LOW DROPOUT VOLTAGE REGULATORS
DS2502 1 kbit Add-Only Memory
DS2502P-E48 48-Bit Node Address Chip
DS2502-UN UniqueWare Add-Only Memory
相關代理商/技術參數(shù)
參數(shù)描述
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 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標準包裝:1 系列:- 功能:充電管理 電池化學:鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:3.75 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應商設備封裝:SOT-23-5 包裝:剪切帶 (CT) 產(chǎn)品目錄頁面:669 (CN2011-ZH PDF) 其它名稱:MCP73831T-2ACI/OTCT
DS2438Z+ 功能描述:電池管理 Smart Battery Monitor RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
DS2438Z+T&R 制造商:Maxim Integrated Products 功能描述:MONITOR MULTI-CHEM 8SOIC N - Tape and Reel 制造商:Maxim Integrated Products 功能描述:BATT MONITOR 8-SOIC T&R PBFREE 制造商:Maxim Integrated Products 功能描述:IC MONITOR SMART BATTERY 8-SOIC 制造商:Maxim Integrated Products 功能描述:Battery Management Smart Battery Monitor
DS2438Z+T&R 功能描述:電池管理 Smart Battery Monitor RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
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