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参数资料
| 型号： | LP3946ILD |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO14 |
| 文件页数： | 5/15页 |
| 文件大小： | 337K |
| 代理商： | LP3946ILD |
Application Notes (Continued)
NI-MH MODE (LP3945 ONLY)
Programming the “mode” bit to HIGH sets the LP3945 to
Ni-MH mode and charges the battery in constant voltage
mode until the battery voltage reaches 5.4V. Since each cell
of the Ni-MH is 1.25V when fully charged, the LP3945 can
only charge exactly four cells. Charging is terminated by the
system micro-controller timer by monitoring the charge cur-
rent. The system micro-controller reads the charge current
value from the Diff Amp output. Charge current in Ni MH can
be programed as in Li Ion mode, from 950 mA to 500 mA in
50 mA step. The 5.6 hr timer is disabled in Ni-MH mode.
I
2C INTERFACE (LP3945 ONLY)
I
2C interface is used in the LP3945 to program various
parameters as shown in Table 3. The LP3945 operates on
default settings during power up. Once programmed, the
LP3945 retains the register data as long as the battery
voltage is above 2.85V. Table 4 shows the charge current
and EOC current programming code.
2C read/write format.
TABLE 3. LP3945 Serial Port Communication Address Code
7h'45
LP3945 Control and Data Codes
Addrs
Register
7
6
5
4
3
2
1
0
8'h00
Charger
Register 1
Mode
(0) = Li-Ion
1 = Ni-MH
Batt Voltage
(0) = 4.1V
1 = 4.2V
Charger
Current
Code 3
(0)
Charger
Current
Code 2
(0)
Charger
Current
Code 1
(0)
Charger
Current
Code 0
(0)
8'h01
Charger
Register 2
EOC
(Green LED)
R/O
Charging
(Red LED)
R/O
EOC Sel 1
(0)
EOC Sel 0
(1)
Numbers in parentheses indicate default setting. “0” bit is set to low state, and “1” bit is set to high state. R/O — Read Only. All other bits are Read and Write.
TABLE 4. Charger Current and EOC Current Programming Code
Data Code
Charger Current Selection
Code I
SET (mA)
Data Code
End of Charge Current
Selection Code
4h'00
500
4h'01
550
2h’1
0.1C
4h'02
600
2h’2
0.15C
4h'03
650
2h’3
0.2C
4h'04
700
4h'05
750
4h'06
800
4h'07
850
4h'08
900
4h'09
950
20066517
w = write (sda = “0”)
r = read (sda = “1”)
ack = acknowledge (sda pulled down by either master or slave)
rs = repeated start
FIGURE 7. LP3945 (Slave) Register Write
LP3945/LP3946
www.national.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LP3946ILDX | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Battery Charge Management System |
| LP3946LD | 制造商:Rochester Electronics LLC 功能描述:STANDALONE CC/CV LIION BATTERY - Bulk |
| LP3946LD/NOPB | 功能描述:IC MANAGEMENT BATT CHARGE 14-LLP RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:1 系列:- 功能:充电管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:3.75 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:剪切带 (CT) 产品目录页面:669 (CN2011-ZH PDF) 其它名称:MCP73831T-2ACI/OTCT |
| LP3947 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:USB/AC Adaptor, Single Cell Li-Ion Battery Charger IC |
| LP3947ISD-09 | 功能描述:电池管理 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 |
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