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參數(shù)資料
| 型號： | L6924D013TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, QCC16 |
| 封裝： | 3 X 3 MM, VFQFPN-16 |
| 文件頁數(shù)： | 20/38頁 |
| 文件大?。?/td> | 1454K |
| 代理商： | L6924D013TR |
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L6924D
Application information: monitoring and protection
Doc ID 11908 Rev 9
27/38
8.2
Battery absence detection
This feature provides a battery absent detection scheme to detect the removal or the
insertion of the battery. If the battery is removed, the charge current falls below the IENDTH.
At the end of the de-glitch time, a detection current IDETECT, equal to 1 mA, is sunk from the
output for a time of TDETECT. The device checks the voltage at the output. If it is below the
VPRETH, a current equal to IDETECT is injected in the output capacitor for a TDETECT, and it is
checked to see if the voltage on the output goes higher than VABS (the value is VOPRGTH-50
mV). If the battery voltage changes from VPRETH to VABS and vice versa in a TDETECT time,
it means that no battery is connected to the charger. The TDETECT is expressed by:
Equation 26
8.3
Status pins
To indicate various charger status conditions, there are two open-collector output pins, ST1
and ST2. These status pins can be used either to drive status LEDs, connected to an
external power source, by a resistor, or to communicate to a host processor. These pins
must never be connected to the VIN when it exceeds their absolute value (6 V).
Figure 22.
Battery absent detection flow chart
3
10
54
×
= MAXCH
DETECT
T
BATTERY
ABSENT
Detect Low Absent
VBAT
>
VPRETH
FAST CHARGE
Detect High Absent
VBAT
>
VRCH
PRE CHARGE
NO
YES
NO
DETECT LOW ABSENT = a ISINK is sunk for a TDET from the battery
DETECT HIGH ABSENT = a IINJ is injected for a TDET in the battery
TDET = 100ms (Typ.)
ISINK = IINJ = 1mA (Typ.)
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| L6924U | 功能描述:電池管理 USB Battery Charger System w/integra 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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