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參數(shù)資料
| 型號： | LP3946ILD |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO14 |
| 文件頁數(shù)： | 5/15頁 |
| 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
13
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LP3946ILDX | 制造商:NSC 制造商全稱: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 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標準包裝:1 系列:- 功能:充電管理 電池化學:鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:3.75 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應商設備封裝:SOT-23-5 包裝:剪切帶 (CT) 產(chǎn)品目錄頁面:669 (CN2011-ZH PDF) 其它名稱:MCP73831T-2ACI/OTCT |
| LP3947 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:USB/AC Adaptor, Single Cell Li-Ion Battery Charger IC |
| LP3947ISD-09 | 功能描述:電池管理 RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
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