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參數(shù)資料
| 型號： | LP3945ILD |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Battery Charge Management System |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO14 |
| 文件頁數(shù)： | 13/15頁 |
| 文件大?。?/td> | 337K |
| 代理商： | LP3945ILD |
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
2
C INTERFACE (LP3945 ONLY)
I
2
C 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.
Figures 7, 8
display I
2
C read/write format.
TABLE 3. LP3945 Serial Port Communication Address Code
7h'45
LP3945 Control and Data Codes
4
Mode
(0) = Li-Ion
1 = Ni-MH
1 = 4.2V
Addrs
8'h00
Register
Charger
Register 1
7
6
5
3
2
1
0
Batt Voltage
(0) = 4.1V
Charger
Current
Code 3
(0)
Charging
(Red LED)
R/O
Charger
Current
Code 2
(0)
EOC Sel 1
(0)
Charger
Current
Code 1
(0)
EOC Sel 0
(1)
Charger
Current
Code 0
(0)
8'h01
Charger
Register 2
EOC
(Green LED)
R/O
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)
500
550
600
650
700
750
800
850
900
950
Data Code
End of Charge Current
Selection Code
4h'00
4h'01
4h'02
4h'03
4h'04
4h'05
4h'06
4h'07
4h'08
4h'09
2h’1
2h’2
2h’3
0.1C
0.15C
0.2C
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
L
www.national.com
13
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LP3945ILDX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Battery Charge Management System |
| LP3945LD | 功能描述:IC MANAGEMENT BATT CHARGE 14-LLP RoHS:否 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(xué):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(yīng)商設(shè)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 |
| LP3946 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Battery Charge Management System |
| 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 |
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