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| 型号： | DS2745U+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/15页 |
| 文件大小： | 0K |
| 描述： | IC BATT MONITOR I2C 8-UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 3,000 |
| 功能： | 燃料，电量检测计/监控器 |
| 电池化学： | 锂离子（Li-Ion）；镍金属氢化物（NiMH） |
| 电源电压： | 2.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-uMAX |
| 包装： | 带卷 (TR) |
DS2745 Low-Cost I 2 C Battery Monitor
POWER MODES
The DS2745 operates in one of two power modes: active and sleep. While in active mode, the DS2745 operates as
a high-precision battery monitor with voltage, temperature, current and accumulated current measurements
acquired continuously and the resulting values updated in the measurement registers. Read and write access is
allowed to all registers.
In sleep mode, the DS2745 operates in a low-power mode with no measurement activity. Serial access to current,
accumulated current, and status/control registers is allowed in sleep mode if V DD > 2V.
The DS2745 operating mode transitions from SLEEP to ACTIVE when:
SDA > V IH OR SCL > V IH
The DS2745 operating mode transitions from ACTIVE to SLEEP when:
SMOD = 1 AND (SDA < VIL AND SCL < VIL) for t SLEEP .
CAUTION : If SMOD = 1, pull-up resistors are required on SCL and/or SDA in order to ensure that the DS2745
transitions from SLEEP to ACTIVE mode when the battery is charged. If the bus is not pulled up, the DS2745
remains in SLEEP and cannot accumulate the charge current. This caution statement applies particularly to on a
battery that is charged on a standalone charger.
VOLTAGE MEASUREMENT
Battery voltage is measured at the VIN input with respect to VSS over a range of 0 to 4.992V (VIN pin is limited to
VDD voltage) and with a resolution of 4.88mV. The result is updated every 440ms and placed in the VOLTAGE
register in two’s compliment form. Voltages above the maximum register value are reported as 7FFFh.
Figure 4. VOLTAGE REGISTER FORMAT
MSB—Address 0C
LSB—Address 0D
S
2 9
2 8
2 7
2 6
2 5
2 4
2 3
2 2
2 1
2 0
X
X
X
X
X
MSb
“S”: sign bit(s), “X”: reserved
LSb
MSb
LSb
Units: 4.88mV
The input impedance of VIN is sufficiently large (>15M ? ) to be connected to a high impedance voltage divider in
order to support multiple cell applications. The pack voltage should be divided by the number of series cells to
present a single cell average voltage to the VIN input. Note that the first voltage measurement made after the
DS2745 is powered or after the ACR register is written will not be valid. The host should wait one measurement
cycle after either of these two conditions occur before reading voltage.
TEMPERATURE MEASUREMENT
The DS2745 uses an integrated temperature sensor to measure battery temperature with a resolution of 0.125°C.
Temperature measurements are updated every 440ms and placed in the Temperature Register in two’s
complement form.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2746 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Low-Cost 2-Wire Battery Monitor with Ratiometric A/D Inputs |
| DS2746_07 | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:Low-Cost 2-Wire Battery Monitor with Ratiometric A/D Inputs |
| DS2746G+ | 功能描述:电池管理 2-Wire Bat Monitor w/Ratiometric A/D IN RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| DS2746G+T&R | 制造商:Maxim Integrated Products 功能描述:MONITOR 2.4V 10TDFN EP - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC MON BATTERY 2-WIRE 10-TDFN |
| DS2746G+T&R | 功能描述:电池管理 2-Wire Bat Monitor w/Ratiometric A/D IN RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
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