參數(shù)資料
型號(hào)： L6924U013
廠商： STMICROELECTRONICS
元件分類： 電源管理
英文描述： POWER SUPPLY SUPPORT CKT, PQCC16
封裝： 3 X 3 MM, ROHS COMPLIANT, VFQFPN-16
文件頁(yè)數(shù)： 20/37頁(yè)
文件大?。?/td> 789K
代理商： L6924U013
L6924U
Application information: monitoring and protection
Doc ID 14716 Rev 2
27/37
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 VRCH (4.05 V). If the battery
voltage changes from VPRETH to VRCH and vice versa in a TDETECT time, it means that no
battery is connected to the charger. The TDETECT is expressed by:
Equation 24
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 with an
external power source, by a resistor, or to communicate to a host processor.
Figure 20.
Battery absence 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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