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參數(shù)資料
| 型號： | DS2740U+T&R |
| 廠商： | Maxim Integrated |
| 文件頁數(shù)： | 5/16頁 |
| 文件大小： | 304K |
| 描述： | IC CURRENT GAUGE(15BIT) 8UMAX |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準包裝： | 3,000 |
| 功能： | 電流計（15 位） |
| 輸入電壓： | 2.7 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-uMAX |
| 包裝： | 帶卷 (TR) |
DS2740
5 of 16
POWER MODES
The DS2740 has two power modes: Active and Sleep. While in Active mode, the DS2740 operates as a
high-precision coulomb counter with current and accumulated current measurement blocks operating
continuously and the resulting values updated in the measurement registers. Read and write access is
allowed to all registers. PIO pin is active. In Sleep mode, the DS2740 operates in a low-power mode with
no current measurement activity. Serial access to current, accumulated current, and status/control
registers is allowed if V
DD
> 2V.
The DS2740 operating mode transitions from SLEEP to ACTIVE when:
1)
DQ > V
IH
, and V
DD
> UV threshold, or
2)
V
DD
rises from below UV threshold to above UV threshold.
The DS2740 operating mode transitions from ACTIVE to SLEEP when:
1) V
DD
falls to UV threshold, or
2) SMOD = 1 and DQ < V
IL
for 2s.
CURRENT MEASUREMENT
In the Active mode of operation, the DS2740 continually measures the current flow into and out of the
battery by measuring the voltage drop across a low-value current-sense resistor, R
SNS
. To extend the input
range for pulse-type load currents, the voltage signal can be filtered by adding a capacitor between the
IS1 and IS2 pins. The external capacitor and two internal resistors form a lowpass filter at the input of the
ADC. The voltage-sense range at IS1 and IS2 is ?1.2mV. The input converts peak signal amplitudes up
to 102mV as long as the continuous or average signal level (post filter) does not exceed ?1.2mV over
the conversion cycle period. The ADC samples the input differentially at IS1 and IS2 with an 18.6kHz
sample clock and updates the current register at the completion of each conversion cycle. Conversion
times for each resolution option are listed in the tables below. Two resolution options are available.
Figure 3 describes the current measurement register format and resolution for each option. S indicates
the sign bit(s).
Figure 3. CURRENT REGISTER FORMAT
DS2740U: Units: 1.5625?/SPAN>V/R
SNS
, 15-bit + sign resolution, 3.5s conversion period.
DS2740BU: Units: 6.250?/SPAN>V/R
SNS
, 13-bit + sign resolution, 0.875s conversion period.
MSBAddress 0Eh LSBAddress 0Fh
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
Full-scale magnitude: ?1.2mV
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| DS2741 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Current Monitor and Accumulator with Integrated Sense Resistor |
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| DS2741N+ | 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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