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參數(shù)資料
| 型號： | DS2438 |
| 英文描述： | Smart Battery Monitor |
| 中文描述： | 智能電池監(jiān)視器 |
| 文件頁數(shù)： | 6/29頁 |
| 文件大?。?/td> | 351K |
| 代理商： | DS2438 |
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DS2438
6 of 29
CURRENT REGISTER FORMAT
Table 3
(This register actually stores the voltage measured across current sense resistor R
SENS
.
This value can be used to calculate battery pack current using the equation below.)
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
LSB
MSb
(unit = 0.2441mV)
LSb
S
2
14
2
13
2
12
2
11
2
10
2
9
2
8
MSB
The battery pack current is calculated from the Current Register value using the equation:
I
= Current Register / (4096 * R
SENS
)
(where R
SENS
is in
)
For example, if 1.25A is flowing into the pack, and the pack uses a 0.025
sense resistor, the DS2438
will write the value 128
10
to the Current Register. From this value, battery pack current can be calculated
to be:
I = 128 / ( 4096 * 0.025) = 1.25A
Because small current ADC offset errors can have a large cumulative effect when current is integrated
over time, the DS2438 provides a method for canceling offset errors in the current ADC. After each
current measurement is completed, the measured value is added to the contents of the Offset Register and
the result is then stored in the Current Register. The Offset Register is a two-byte nonvolatile read/write
register formatted in two’s-complement format. The four MSb’s of the register contain the sign of the
offset, as shown in Table 4.
OFFSET REGISTER FORMAT
Table 4
2
4
2
3
2
2
2
1
2
0
0
0
0
LSB
MSb
(unit = 0.2441 mV)
LSb
X
X
X
S
2
8
2
7
2
6
2
5
MSB
The following process can be used to calibrate the current ADC:
1.
Write all zeroes to the Offset Register
2.
Force zero current through R
SENS
3.
Read the Current Register value
4.
Disable the current ADC by setting the IAD bit in the Status/Configuration Register to “0”
5.
Change the sign of the previously-read Current Register value by performing the two’s complement
and write the result to the Offset Register
6.
Enable the current ADC by setting the IAD bit in the Status/Configuration Register to “1”
NOTE:
When writing to the Offset Register, current measurement MUST be disabled (IAD bit set to “0”).
The current ADC calibration process is done for each DS2438 device prior to shipment. However, for
best results, battery pack manufacturers should calibrate the current ADC during initial battery pack
testing, and the host system should calibrate whenever possible (during battery charging, for example).
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相關代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS2438AZ | 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 |
| DS2438AZ/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 |
| DS2438AZ/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 |
| DS2438AZ+ | 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 |
| DS2438AZ+ | 制造商:Maxim Integrated Products 功能描述:IC BATTERY MONITOR LI-ION 10V SOIC-8 |
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