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参数资料
| 型号： | DS2784G+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 19/43页 |
| 文件大小： | 0K |
| 描述： | IC FUEL GAUGE STND-ALONE 14-TDFN |
| 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）、锂聚合物（Li-Pol） |
| 电源电压： | 2.5 V ~ 4.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-WFDFN 裸露焊盘 |
| 供应商设备封装： | 14-TDFN-EP（3x5） |
| 包装： | 带卷 (TR) |
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the gain from 0 to 1.999 in steps of 0.001 (precisely 2 ). The user must program RSGAIN cautiously to ensure
DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication
CURRENT MEASUREMENT CALIBRATION
The DS2784’s current measurement gain can be adjusted through the RSGAIN register, which is factory calibrated
to meet the data sheet-specified accuracy. RSGAIN is user accessible and can be reprogrammed after module or
pack manufacture to improve the current measurement accuracy. Adjusting RSGAIN can correct for variation in an
external sense resistor’s nominal value, and allows the use of low-cost, nonprecision, current-sense resistors.
RSGAIN is an 11-bit value stored in 2 bytes of the parameter EEPROM memory block. The RSGAIN value adjusts
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accurate current measurement. When shipped from the factory, the gain calibration value is stored in two separate
locations in the parameter EEPROM block: RSGAIN, which is reprogrammable, and FRSGAIN, which is read only.
RSGAIN determines the gain used in the current measurement. The FRSGAIN value is provided to preserve the
factory calibration value only and is not used to calibrate the current measurement. The 16-bit FRSGAIN value is
readable from addresses B0h and B1h.
CURRENT MEASUREMENT GAIN REGISTER FORMAT
MSB—ADDRESS 78h
LSB—ADDRESS 79h
X
X
X
X
X
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: 2
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SENSE RESISTOR TEMPERATURE COMPENSATION
The DS2784 can temperature compensate the current-sense resistor to correct for variation in a sense resistor’s
value overtemperature. The DS2784 is factory programmed with the sense-resistor temperature coefficient, RSTC,
set to zero, which turns off the temperature compensation function. RSTC is user accessible and can be
reprogrammed after module or pack manufacture to improve the current accuracy when using a high-temperature
coefficient current-sense resistor. RSTC is an 8-bit value stored in the parameter EEPROM memory block. The
RSTC value sets the temperature coefficient from 0 to +7782ppm/oC in steps of 30.5ppm/oC. The user must
program RSTC cautiously to ensure accurate current measurement.
Temperature compensation adjustments are made when the temperature register crosses 0.5 o C boundaries. The
temperature compensation is most effective with the resistor placed as close as possible to the V SS terminal. This
optimizes thermal coupling of the resistor to the on-chip temperature sensor.
SENSE RESISTOR TEMPERATURE COMPENSATION REGISTER FORMAT
ADDRESS 7Ah
2
2
2
2
2
2
2
2
7
6
5
4
3
2
1
0
MSb
LSb
Units: 30.5ppm/oC
CURRENT ACCUMULATION
Current measurements are internally summed, or accumulated, at the completion of each conversion period and
the results are stored in the ACR. The accuracy of the ACR is dependent on both the current measurement and the
conversion time base. The ACR has a range of 0 to 409.6mVh with an LSb of 6.25 μ Vh. Additional registers hold
fractional results of each accumulation to avoid truncation errors. The fractional result bits are not user accessible.
Accumulation of charge current above the maximum register value is reported at the maximum value; conversely,
accumulation of discharge current below the minimum register value is reported at the minimum value.
Charge currents (positive current register values) less than 100 μ V are not accumulated in order to mask the effect
of accumulating small positive offset errors over long periods. This limits the minimum charge current, for coulomb-
counting purposes, to 5mA for R SNS = 0.020 ? and 20mA for R SNS = 0.005 ? .
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2784K | 功能描述:电源管理IC开发工具 RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| DS2786 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Standalone OCV-Based Fuel Gauge |
| DS2786_09 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Stand-Alone OCV-Based Fuel Gauge |
| DS2786B | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Stand-Alone OCV-Based Fuel Gauge |
| DS2786BEVKIT+ | 制造商:Maxim Integrated Products 功能描述:STANDALONE OCV-BASED FUEL GAUGE - Boxed Product (Development Kits) |
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