参数资料
| 型号： | ATEVK527 |
| 厂商： | Atmel |
| 文件页数： | 6/35页 |
| 文件大小： | 0K |
| 描述： | KIT EVAL PWM AVR USB 4 SERIES |
| 标准包装： | 1 |
| 系列： | AVR® |
| 主要目的： | 电源管理，电池充电器 |
| 嵌入式： | 是，MCU，8 位 |
| 已用 IC / 零件： | ATmega16U4，ATmega32U4 |
| 主要属性： | 1 芯锂离子电池 |
| 次要属性： | 图形用户界面，USB 接口 |
| 已供物品： | 板 |
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3.2.3 Charge Stages
Lithium-Ion battery charge follows three stages:
1. Prequalification current: Charging of a Li-Ion battery starts with a test of battery
voltage. If the voltage is under a defined threshold (PREQUAL_VOLTAGE), the
charge starts with a fixed low current.
2. Constant current. The charge continues with applying constant current to the
battery. The size of the charge current is battery-dependent and given by the
manufacturer. This stage is complete when battery voltage has reached the
threshold given by the manufacturer.
3. Constant voltage. After battery threshold voltage has been reached the charger will
switch from supplying constant current to supplying constant voltage. This stage is
complete when charge current has dropped below the threshold given by the
manufacturer.
The below figure illustrates voltage and current of a lithium-ion battery during
charging.
Figure 3-1. Charge stages and limits of a VARTA? EasyPack 550mAh
Voltage/Current
OVERCHARGE VOLTAGE LIMIT
4.2V
Vbatt
3V
OVERDISCHARGE VOLTAGE LIMIT
260mA
Ibatt
100mA
10mA
ICUTOFF
t
CONSTANT CURRENT CHARGE
CONSTANT VOLTAGE CHARGE
In the figure above, “Overcharge” is the level at which cell protection circuitry cuts in
and opens a solid-state switch and discontinues the charge current path. After this,
battery voltage typically needs to drop several hundred millivolts before the current
path is restored. “Overdischarge” is the level at which the current path is cut in order
to prevent the battery from over-discharging.
6
AVR146
7801A-AVR-06/08
相关PDF资料 |
PDF描述 |
|---|---|
| ATICE10 | AVR IN CIRCUIT EMULATOR |
| ATICE50POD | REPLACEMENT POD FOR ICE40,ICE50 |
| ATQT600IB | BOARD INTERFACE ATQT600IB |
| ATSTK1000 | KIT STARTER FOR AVR32AP7000 |
| ATSTK501 | ADAPTER KIT FOR 64PIN AVR MCU |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ATEVKLCD100 | 功能描述:处理器配件 NGW100 ADD-ON QVGA LCD, AUDIO RoHS:否 制造商:Olimex Ltd. 产品:Cable 用于: |
| ATEVKLCD101 | 功能描述:处理器配件 NGW100 ADD-ON VGA LCD, AUDIO RoHS:否 制造商:Olimex Ltd. 产品:Cable 用于: |
| ATEVK-MXT1066T2-A | 功能描述:EVAL BOARD FOR MXT1066T2 制造商:microchip technology 系列:- 零件状态:在售 主要用途:接口，触摸屏控制器 嵌入式:- 使用的 IC/零件:mXT1066T2 主要属性:- 辅助属性:- 所含物品:板 标准包装:1 |
| ATEVK-MXT1189TAT-A | 功能描述:EVAL BOARD FOR MXT1189TAT 制造商:microchip technology 系列:- 零件状态:在售 主要用途:接口，触摸屏控制器 嵌入式:- 使用的 IC/零件:mXT1189TAT 主要属性:- 辅助属性:- 所含物品:板 标准包装:1 |
| ATEVK-MXT1189TAT-B | 功能描述:EVAL BOARD FOR MXT1189TAT 制造商:microchip technology 系列:- 零件状态:在售 主要用途:接口，触摸屏控制器 嵌入式:- 使用的 IC/零件:mXT1189TAT 主要属性:- 辅助属性:- 所含物品:板 标准包装:1 |
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