參數(shù)資料
型號(hào)： TWL2214CAPFB
廠商： TEXAS INSTRUMENTS INC
元件分類： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQFP48
封裝： PLASTIC, TQFP-48
文件頁(yè)數(shù)： 24/39頁(yè)
文件大?。?/td> 583K
代理商： TWL2214CAPFB
TWL2214CA
POWER SUPPLY MANAGEMENT IC AND
LiIon BATTERY CHARGE CONTROL
SLVS321A – OCTOBER 2001 – REVISED JANUARY 2002
30
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
battery pack wake-up
Li-Ion cells can be easily damaged by overcharging or overdischarging. To prevent damage, a pack-protector
device is used within the battery pack. During the charging cycle, if the pack-protector senses an over-voltage
condition, it disconnects the pack from the charger to prevent further charging but allows discharging. During
the discharging cycle, if the protector senses an under-voltage condition, it disconnects the cell from the load
to prevent further discharging.
This phase of the charging cycle provides a wake-up capability for the battery pack with a pack-protector device.
At the start of the charge cycle, the TWL2214CA device provides a wake-up signal of 1 mA and 4.3 V to the
battery pack. At the end of the 8-second time limit, if the battery pack voltage remains at 4.3 V, a no-battery flag
is set in the status register to signal the condition that the charging path is open. If the battery voltage is below
2.5 V, a BATTERR flag is set in the status register to signal a bad battery cell. In either case, the charging activity
is halted.
_
+
R1
R2
BG
Wake-Up
Enable
No Battery
Battery
TWL2214CA
Control
Logic
_
+
–
1 mA
BG = 1.2 V
R1 + R2
R2
BG
×
= 4.3 V
VDD1
VBAT
VCHG
Figure 18. Battery Pack Wake Up
precharge
The TWL2214CA device starts the precharge phase when the battery voltage is less than 3.2 V. The precharge
time is limited by the PTR timer. The precharge current level is set by an external resistor. The maximum
precharge current the charger can supply is 100 mA. Use the following equation to choose the external resistor
value.
R
PR +
V
PRE
I
PRE
45, V
PRE + 1.2V " 10%
Where:
RPR = External resistor
IPRE = Desired precharge current
VPRE = Voltage at RPRE terminal
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