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參數(shù)資料
| 型號： | DS2740 |
| 元件分類： | 通用總線功能 |
| 英文描述： | High-Precision Coulomb Counter |
| 中文描述： | 高精度庫侖計 |
| 文件頁數(shù)： | 5/15頁 |
| 文件大小： | 248K |
| 代理商： | DS2740 |
DS2740
5 of 15
CURRENT RESOLUTION (1 LSB)
R
SNS
PART
CONVERSION
TIME
V
IS1
- V
IS2
20m
78.13 A
312.5 A
15m
104.2 A
416.7 A
10m
156.3 A
625 A
5m
DS2740
DS2740B
3.515s
0.878s
1.5625 V
6.250 V
312.5 A
1.250mA
Every 1024th conversion, the ADC measures its input offset to facilitate offset correction. Offset
correction occurs approximately once per hour in the DS2740 and four times per hour in the DS2740B.
The resulting correction factor is applied to the subsequent 1023 measurements. During the offset
correction conversion, the ADC does not measure the IS1 to IS2 signal. A maximum error of 1/1024 in
the accumulated current register (ACR) is possible, however, to reduce the error, the current measurement
just prior to the offset conversion is displayed in the current register and is substituted for the dropped
current measurement in the current accumulation process. The typical error due to offset correction is
much less than 1/1024.
CURRENT ACCUMULATOR
Current measurements are internally summed, or accumulated, at the completion of each conversion
period with the results displayed in the ACR. The accuracy of the ACR is dependent on both the current
measurement and the conversion timebase. The ACR has a range of ±204.8mVh with an LSb of
6.25
μ
Vh Additional registers hold fractional results of each accumulation, however, these bits are not
user accessible.
Read and write access is allowed to the ACR. Whenever the ACR is written, fractional accumulation
results are cleared. Also, a write forces the ADC to measure its offset and update the offset correction
factor. The current measurement and accumulation begin with the second conversion following a write to
the ACR. Figure 4 describes the ACR address, format, and resolution.
Figure 4.
CURRENT ACCUMULATOR FORMAT
MSB—Address 10
LSB—Address 11
S
2
14
2
13
2
12
2
11
2
10
2
9
2
8
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
MSb
LSb
MSb
LSb
Units:
6.25 Vh/Rsns
ACR LSB
R
SNS
PART
UPDATE
INTERVAL
V
IS1
- V
IS2
20m
15m
10m
5m
DS2740
DS2740B
3.515s
0.878s
6.25 Vh
312.5 Ah
416.7 Ah
625 Ah
1.250mAh
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS2740B | High-Precision Coulomb Counter |
| DS2740BU | High-Precision Coulomb Counter |
| DS2740U | High-Precision Coulomb Counter |
| DS2760E-025 | High Precision Li-Ion Battery Monitor |
| DS2760XA-025 | High Precision Li-Ion Battery Monitor |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS2740B | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:High-Precision Coulomb Counter |
| DS2740BU | 制造商:Maxim Integrated Products 功能描述:HI PRECISION COUL CNTR USOP 8 PIN - Rail/Tube |
| DS2740BU/R | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:High-Precision Coulomb Counter |
| DS2740BU/T | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:High-Precision Coulomb Counter |
| DS2740BU/T&R | 功能描述:電池管理 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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