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| 型号： | DS2777G+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 16/46页 |
| 文件大小： | 0K |
| 描述： | IC FUEL GAUGE LI+ 2CELL 14-TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 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： | 4 V ~ 9.2 V |
| 工作温度： | -20°C ~ 70°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： | 管件 |
| 产品目录页面： | 1436 (CN2011-ZH PDF) |
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2-Cell, Stand-Alone, Li+ Fuel-Gauge IC with
Protector and Optional SHA-1 Authentication
Current Offset Correction
Every 1024th conversion, the ADC measures its input
offset to facilitate offset correction. Offset correction
occurs approximately once per hour. The resulting cor-
rection factor is applied to the subsequent 1023 mea-
surements. During the offset correction conversion, the
ADC does not measure the sense resistor signal. A
maximum error of 1/1024 in the Accumulated Current
register (ACR) is possible; however, to reduce the error,
the current measurement made just prior to the offset
conversion is retained in the Current register and is
substituted for the dropped current measurement in the
current accumulation process. Therefore the accumu-
lated current error due to offset correction is typically
much less than 1/1024.
Current Offset Bias
The current offset bias value (COB) allows a program-
mable offset value to be added to raw current measure-
ments. The result of the raw current measurement plus
COB is displayed as the current measurement result in
the Current register and is used for current accumula-
tion. COB can be used to correct for a static offset error
or can be used to intentionally skew the current results
and therefore the current accumulation. Read and write
access is allowed to COB. Whenever the COB is writ-
ten, the new value is applied to all subsequent current
measurements. COB can be programmed in 1.56μV
steps to any value between -199.7μV and +198.1μV.
The COBR value is stored as a two’s complement value
in volatile memory and must be initialized through the
interface on power-up. The factory default value is 00h.
Current Blanking
The current blanking feature modifies current measure-
ment result prior to being accumulated in the ACR.
Current blanking occurs conditionally when a current
measurement (raw current and COBR) falls in one of
two defined ranges. The first range prevents charge
currents less than 100μV from being accumulated. The
second range prevents discharge currents less than
25μV in magnitude from being accumulated. Charge
current blanking is always performed; however, dis-
charge current blanking must be enabled by setting the
NBEN bit in the Control register. See the Control
Register Format description for additional information.
Current Measurement Gain
The DS2775–DS2778’s current measurement gain can
be adjusted through the RSGAIN register, which is facto-
ry 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 the gain from 0 to 1.999 in steps
of 0.001 (precisely 2–10). The user must use caution
when programming RSGAIN to ensure 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 reprogram-
mable and FRSGAIN, which is read-only. RSGAIN deter-
mines the gain used in the current measurement. The
ADDRESS 7Bh
S
2 6
2 5
2 4
2 3
2 2
2 1
2 0
MSb
“S ”: SIGN BIT(S)
Figure 8. Current Offset Bias Register Format
MSB—ADDRESS 78h
LSb
UNITS: 1.56 μV/R SNS
LSB—ADDRESS 79h
X
SC0
OC1
OC0
X
2 0
2 -1
2 -2
2 -3
2 -4
2 -5
2 -6
2 -7
2 -8
2 -9
2 -10
MSb
“X ”: RESERVED
LSb
MSb
UNITS: 2 –10
LSb
Figure 9. RSGAIN Register
16
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2777G+ | 功能描述:电池管理 2-Cell Stand-Alone Li+ Fuel-Gauge 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 |
| DS2777G+T&R | 制造商:Maxim Integrated Products 功能描述: 制造商:Maxim Integrated Products 功能描述:2S FG PROT 2W 14L 3X5 TDFN T&R - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC FUEL GAUGE LI+ 2CELL 14-TDFN 制造商:Maxim Integrated Products 功能描述:Battery Management 2-Cell Stand-Alone Li+ Fuel-Gauge |
| DS2777G+T&R | 功能描述:电池管理 2-Cell Stand-Alone Li+ Fuel-Gauge 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 |
| DS2777G+TR | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:2-Cell, Stand-Alone, Li+ Fuel-Gauge IC with Protector and Optional SHA-1 Authentication |
| DS2777GR | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:2-Cell, Stand-Alone, Li+ Fuel-Gauge IC with Protector and Optional SHA-1 Authentication |
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