- 您现在的位置：买卖IC网 > PDF目录16211 > DS2784G+ (Maxim Integrated Products)IC FUEL GAUGE STND-ALONE 14-TDFN PDF资料下载
参数资料
| 型号： | DS2784G+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 24/43页 |
| 文件大小： | 0K |
| 描述： | IC FUEL GAUGE STND-ALONE 14-TDFN |
| 产品培训模块： | 1-Wire Communications 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： | 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： | 管件 |
| 产品目录页面： | 1437 (CN2011-ZH PDF) |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页当前第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页
DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication
the charge current 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 19.5mV and can range from 0V to 4.978V. VAE is located in the parameter
EEPROM block. See the Modeling Cell Characteristics section for more information.
Active Empty Current (IAE) —IAE stores the discharge current threshold used to detect the active empty point.
The unsigned value represents the magnitude of the discharge current and is stored in 1-byte with units of 200 μ V
and can range from 0 to 51.2mV. Assuming R SNS = 20m ? , IAE can be programmed from 0mA to 2550mA in 10mA
steps. IAE is located in the Parameter EEPROM block. See the Cell Model Construction section for more
information.
Aging Capacity (AC) —AC stores the rated cell capacity, which is used to estimate the decrease in battery
capacity that occurs during normal use. The value is stored in 2 bytes in the same units as the ACR (6.25 μ Vh).
When set to the manufacturer’s rated cell capacity the aging estimation rate is approximately 2.4% per 100 cycles
of equivalent full capacity discharges. Partial discharge cycles are added to form equivalent full capacity
discharges. The default aging estimation results in 88% capacity after 500 equivalent cycles. The aging estimation
rate can be adjusted by setting the AC to a value other than the cell manufacturer’s rating. Setting AC to a lower
value, accelerates the aging estimation rate. Setting AC to a higher value, retards the aging estimation rate. The
AC is located in the parameter EEPROM block.
-7
(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 the learning of a larger capacity on batteries that have an initial capacity greater
than the rated cell capacity programmed in the cell characteristic table. The AS is modified by aging estimation
introduced under aging capacity and by the capacity-learn function. The host system has read and write access to
the AS, however caution should exercised when writing it to ensure that the cumulative aging estimate is not
overwritten with an incorrect value. The AS is automatically saved to EEPROM (see Table 7 for details). The
EEPROM value is recalled on power-up.
Full capacity estimation based on the learn function is more accurate than the cycle-count-based estimation. The
learn function reflects the current performance of the cell. Cycle count based estimation is an approximation
derived from the manufacturer’s recommendation for a typical cell. Batteries are typically considered worn-out when
the full capacity reaches 80% of the rated capacity, therefore, the AS value is not required to range to 0%. It is
clamped to 50% (64d or 40h). If a value of 50% is read from the AS, the host should prompt the user to initiate a
learning cycle.
CAPACITY ESTIMATION OPERATION
Aging Estimation
As discussed above, 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 the AC.
The AS is then decremented by one, resulting in a decrease of the scaled full battery capacity by 0.78%
(approximately 2.4% per 100 cycles). See the AC register description above for recommendations 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. Then, once
charging starts, the charge must continue uninterrupted until the battery is charged to full. Upon detecting full,
LEARNF is cleared, the charge to full (CHGTF) flag is set, and the age scalar (AS) is adjusted according to the
learned capacity of the cell.
24 of 43
相关PDF资料 |
PDF描述 |
|---|---|
| M3AAA-3460K | IDC CABLE - MSC34A/MC34F/MSC34A |
| EEM43DRMH | CONN EDGECARD 86POS .156 WW |
| 5500R-224K | HIGH CURRENT POWER CHOKE 220UH |
| A3KKB-1606G | IDC CABLE - APK16B/AE16G/APK16B |
| DS2778G+ | IC FUEL GAUGE LI+ 2CELL 14-TDFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2784G R | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication |
| DS2784G T | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication |
| DS2784G+ | 功能描述:电池管理 Stand-Alone 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 |
| DS2784G+R | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:1-Cell Stand-Alone Fuel Gauge IC with Li Protector and SHA-1 Authentication |
| DS2784G+T | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:1-Cell Stand-Alone Fuel Gauge IC with Li Protector and SHA-1 Authentication |
发布紧急采购，3分钟左右您将得到回复。