“loose” cells. Temperature, voltage, and charge time
are monitored to provide proper fast-charging control
algorithms for nickel metal hydride (NiMH) batteries.
Battery tests are included to detect defective or
inappropriate cells such as alkaline primary batteries.
The DS2711/DS2712 support series and parallel
topologies, with independent monitoring and control of
each cell. Charging of NiCd chemistry cells is also
supported.
PIN CONFIGURATION
CC1
CC2
LED1
VSS
LED2
CSOUT
VN1
VN0
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
APPLICATIONS
Desktop/Stand-Alone Chargers (AAA/AA)
Digital Still Cameras
Music Players
Games
Toys
VP2
VP1
THM2
THM1
VDD
TMR
CTST
DMSEL
SO (150 mils)
TSSOP (4.4mm)
PIN DESCRIPTION
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
NAME
CC1
CC2
LED1
V
SS
LED2
CSOUT
VN1
VN0
DMSEL
CTST
TMR
V
DD
THM1
THM2
VP1
VP2
FUNCTION
Cell 1 Charge-Control Output
Cell 2 Charge-Control Output
Cell 1 Status
Ground Reference and Chip-
Supply Return
Cell 2 Status, Mode-Select Input
Current-Sense Output
Current-Sense + Input
Current-Sense - Input
Display-Mode Select
Cell Test Threshold Set
Charge Timer Set
Chip-Supply Input (4.0V to 5.5V)
Cell 1 Thermistor Input
Cell 2 Thermistor Input
Cell 1 Positive-Terminal Sense
Input
Cell 2 Positive-Terminal Sense
Input
FEATURES
Charge 1 or 2 NiMH Cells
Detect and Avoid Charging Alkaline Cells
Precharge Deeply Depleted Cells
Fast Charge NiMH with -∆V Termination
Sensitivity of 2mV (typ)
Monitor Voltage, Temperature, and Time for
Safety and Secondary Termination
Regulate Charge Current:
Linear Control (DS2711)
Switch-Mode Control (DS2712)
Drive pMOS or pnp-Type Pass Element or
Switch, or an Optocoupler
Compatible with Popular Optocouplers and
Integrated Primary-Side PWM Controllers
Small 16-Pin SO or TSSOP Packages
1 of 15
DS2711/DS2712: Loose-Cell NiMH Chargers
ABSOLUTE MAXIMUM RATINGS
Voltage Range on All Pins Relative to V
SS
……………………………………………………………………-0.3V to +6V
Voltage Range on DMSEL……………………………………………….……………………………………….V
DD
+ 0.3V
Continuous Sink Current CC1, CC2, LED1, LED2, and CSOUT………………………………............................20mA
Operating Temperature Range………………………………………………………………………………-40°C to +85°C
Storage Temperature Range……………………………………………………………………………….-55°C to +125°C
Lead Temperature (soldering, 10s) ................................................................................................................. +300°C
当今的计算机外部设备,都在追求高速度和高通用性。为了满足用户的需求,以Intel为首的七家公司于1994年推出了USB(Universal Serial Bus,通用串行总线)总线协议,专用于低、中速的计算机外设。目前,USB端口已成为微机主板的标准端口;而在不久的将来,所有的微机外设,包括键盘、鼠标、显示器、打印机、数字相机、扫描仪和游戏柄等等,都将通过USB与主机相连。
...[详细]