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| 型号： | DS2790E+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 30/41页 |
| 文件大小： | 0K |
| 描述： | IC FUEL GAUGE BATT 28TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 功能： | 燃料，电量检测计/监控器 |
| 电池化学： | 锂离子（Li-Ion） |
| 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： | 28-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 28-TSSOP |
| 包装： | 带卷 (TR) |
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DS2790 Programmable 1-Cell Li-Ion Fuel Gauge and Protector
ANALOG-TO-DIGITAL CONVERSION
The DS2790 performs real-time measurements of system temperature, voltage, current, and accumulated current.
The DS2790’s analog-to-digital converter is controlled by an internal state machine that sequences the
measurements, and stores the results in memory. The conversion results of the ADC are mapped into data
memory starting at word address 6003h, as shown in table 12. Programs should read a measurement value as a
word to ensure that the value does not change between instructions.
The DS2790 current measurement system is designed to provide timely data on charge and discharge current at a
moderate resolution level while simultaneously accumulating high resolution average data to support accurate
coulomb counting. Current is measured by sampling the voltage drop across a series sense resistor, R SNS ,
connected between SNS1 and SNS2. Individual current samples are taken every 1/f SAMP (687μs). All samples are
averaged to report Current, Average Current, and Accumulated Current values.
The DS2790 measures voltage as a difference between the V IN pin and analog ground pin AV SS . Individual voltage
samples are taken approximately every 1/f SAMP (687μs). Multiple samples are averaged to update the Average
Voltage register.
The DS2790 measures temperature directly on chip. Individual temperature samples are taken every 10/f SAMP
(6.87ms). Multiple samples are averaged to update the Average Temperature register.
Table 12. ADC Related Registers
WORD
ADDRESS
6003h
6004h
6005h
6006h
6007h
6008h
6009h
600Ah
ACCESS
Read Only
Read Only
Read Only
R/W
Read Only
Read Only
Read Only
R/W
DESCRIPTION
Voltage Register
Current Register
Temperature Register
Accumulated Current Register
Accumulated Current (Middle Word)
Accumulated Current (Lower Word)
Average Current Register
ADC Configuration Register
Current Measurement
The voltage signal developed across the sense resistor (between SNS1 and SNS2) is differentially sampled by the
ADC inputs via internal 10k ? resistors connected between SNS1 and IS1, and SNS2 and IS2. Isolating the ADC
inputs (IS1 and IS2 pins) from the sense resistor with 10k ? facilitates the use of an RC filter by adding a single
external capacitor. The RC filter extends the effective input range beyond ±64mV in pulse-load or pulse-charge
applications. The ADC accurately measures large peak signals as long as the differential signal level at IS1 and
IS2 does not exceed ±64mV.
The Current register reports the average of 128 individual current samples every 88ms. The reported value
represents the average current during the 88ms measurement period. The Average Current register reports the
average of 4096 current samples and is updated every 2.8s.
Figures 11 and 12 specify the update interval and units for the Current and Average Current registers. Values are
posted in two’s compliment format. Positive values represent charge currents (V IS1 > V IS2 ) and negative values
represent discharge currents (V IS2 > V IS1 ). Positive currents above the maximum register value are reported at the
maximum value, 7FFFh. Negative currents below the minimum register value are reported at the minimum value,
8000h.
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相关代理商/技术参数 |
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|---|---|
| DS2790G | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Programmable 1-Cell Li-Ion Fuel Gauge and Protector |
| DS2790G+ | 功能描述:IC FUEL GAUGE BATT 28-TDFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:1 系列:- 功能:充电管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:3.75 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:剪切带 (CT) 产品目录页面:669 (CN2011-ZH PDF) 其它名称:MCP73831T-2ACI/OTCT |
| DS2790G+T&R | 制造商:Maxim Integrated Products 功能描述:IC FUEL GAUGE BATT 28-TDFN |
| DS2790G+T&R | 功能描述:IC FUEL GAUGE BATT 28-TDFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:1 系列:- 功能:充电管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:3.75 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:剪切带 (CT) 产品目录页面:669 (CN2011-ZH PDF) 其它名称:MCP73831T-2ACI/OTCT |
| DS2792G+ | 功能描述:IC PROG FUEL GAUGE W/UART 28TDFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:1 系列:- 功能:充电管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:3.75 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:剪切带 (CT) 产品目录页面:669 (CN2011-ZH PDF) 其它名称:MCP73831T-2ACI/OTCT |
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