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参数资料
| 型号： | DS2788E+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/32页 |
| 文件大小： | 0K |
| 描述： | IC FUEL GAUGE W/DSP DRV 14TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 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 ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 14-TSSOP |
| 包装： | 管件 |
| 产品目录页面： | 1437 (CN2011-ZH PDF) |
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Stand-Alone Fuel-Gauge IC with
LED Display Drivers
Application Parameters
In addition to cell model characteristics, several appli-
cation parameters are needed to detect the full and
empty points, as well as calculate results in mAh units.
Sense Resistor Prime (RSNSP)
RSNSP stores the value of the sense resistor for use in
computing the absolute capacity results. The value is
stored as a 1-byte conductance value with units of
mhos. RSNSP supports resistor values of 1 Ω to
3.922m Ω . RSNSP is located in the parameter EEPROM
block.
Charge Voltage (VCHG)
VCHG stores the charge voltage threshold used to
detect a fully charged state. The value is stored as a
1-byte voltage with units of 19.52mV and can range
from 0 to 4.978V. VCHG should be set marginally less
than the cell voltage at the end of the charge cycle to
ensure reliable charge termination detection. VCHG is
located in the parameter EEPROM block.
Minimum Charge Current (IMIN)
IMIN stores the charge current threshold used to detect
a fully charged state. The value is stored as a 1-byte
value with units of 50μV and can range from 0 to
12.75mV. Assuming R SNS = 20m Ω , IMIN can be pro-
grammed from 0 to 637.5mA in 2.5mA steps. IMIN
should be set marginally greater than the charge cur-
rent at the end of the charge cycle to ensure reliable
charge termination detection. IMIN is located in the
parameter EEPROM block.
Active Empty Voltage (VAE)
VAE stores the voltage threshold used to detect the
active empty point. The value is stored in 1 byte with
units of 19.52mV and can range from 0 to 4.978V. VAE
is located in the parameter EEPROM block.
Active Empty Current (IAE)
IAE stores the discharge current threshold used to
detect the active empty point. The unsigned value rep-
resents the magnitude of the discharge current and is
stored in 1 byte with units of 200μV and can range from
0 to 51.2mV. Assuming R SNS = 20m Ω , IAE can be pro-
grammed from 0mA to 2550mA in 10mA steps. IAE is
located in the parameter EEPROM block.
Aging Capacity (AC)
AC stores the rated battery capacity used in estimating
the decrease in battery capacity that occurs in normal
use. The value is stored in 2 bytes in the same units as
the ACR (6.25μVh). Setting AC to the manufacturer’s
rated capacity sets the aging rate to approximately
2.4% per 100 cycles of equivalent full capacity dis-
charges. Partial discharge cycles are added to form
equivalent full capacity discharges. The default estima-
tion results in 88% capacity after 500 equivalent cycles.
The estimated aging rate can be adjusted by setting
AC to a different value than the cell manufacturer’s rat-
ing. Setting AC to a lower value, accelerates the esti-
mated aging. Setting AC to a higher value retards the
estimated aging. AC is located in the parameter
EEPROM block.
Age Scalar (AS)
AS adjusts the capacity estimation results downward to
compensate for cell aging. AS is a 1-byte value that
represents values between 49.2% and 100%. The LSB
is weighted at 0.78% (precisely 2 -7 ). A value of 100%
(128 decimal or 80h) represents an unaged battery. A
value of 95% is recommended as the starting AS value
at the time of pack manufacture to allow learning a larg-
er capacity on batteries that have an initial capacity
greater than the nominal capacity programmed in the
cell characteristic table. AS is modified by the cycle-
count-based age estimation introduced above and by
the capacity learn function. The host system has read
and write access to AS, however caution should be
exercised when writing AS to ensure that the cumula-
tive aging estimate is not overwritten with an incorrect
value. Typically, it is not necessary for the host to write
AS because the DS2788 automatically saves AS to
EEPROM on a periodic basis. (See the Memory section
for details.) The EEPROM-stored value of AS is recalled
on power-up.
Capacity Estimation Utility
Functions
Aging Estimation
As previously discussed, the AS register value is
adjusted occasionally based on cumulative discharge.
As the ACR register decrements during each discharge
cycle, an internal counter is incremented until equal to
32 times AC. AS is then decremented by one, resulting
in a decrease in the scaled full battery capacity of
0.78%. See the AC register description for recommen-
dations on customizing the age estimation rate.
Learn Function
Since Li+ cells exhibit charge efficiencies near unity, the
charge delivered to a Li+ cell from a known empty point
to a known full point is a dependable measure of the
cell capacity. A continuous charge from empty to full
results in a “learn cycle.” First, the active empty point
must be detected. The learn flag (LEARNF) is set at this
point. Second, once charging starts, the charge must
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2788E+ | 功能描述:电池管理 Stand-Alone F-Gauge w/LED Display Drvrs 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 |
| DS2788E+T&R | 制造商:Maxim Integrated Products 功能描述: 制造商:Maxim Integrated Products 功能描述:FUEL GAUGE LI-ION/LI-POL 14TSSOP - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC FUEL GAUGE W/DSP DRV 14TSSOP |
| DS2788E+T&R | 功能描述:电池管理 Stand-Alone F-Gauge w/LED Display Drvrs 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 |
| DS2788E+TR | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Stand-Alone Fuel-Gauge IC with LED Display Drivers |
| DS2788EVKIT+ | 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 |
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