L6924D STMicroelectronics, L6924D Datasheet - Page 27
![IC BATTERY CHARGER SYS 16-VFQFPN](/photos/6/58/65862/497-16-vfqfpn_series_sml.jpg)
L6924D
Manufacturer Part Number
L6924D
Description
IC BATTERY CHARGER SYS 16-VFQFPN
Manufacturer
STMicroelectronics
Datasheet
1.L6924D013TR.pdf
(38 pages)
Specifications of L6924D
Function
Charge Management
Battery Type
Lithium-Ion (Li-Ion), Lithium-Polymer (Li-Pol)
Voltage - Supply
2.5 V ~ 12 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
16-VFQFN
Product
Charge Management
Output Current
30 mA
Operating Supply Voltage
2.5 V to 12 V
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
For Use With
497-8428 - BOARD EVAL CHARGER ST7260/L6924D497-8247 - BOARD EVAL FOR L6924UTR497-5504 - EVAL BOARD FOR L6924D
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
L6924D013TR
Manufacturer:
ST
Quantity:
2 100
Company:
Part Number:
L6924D013TR
Manufacturer:
st
Quantity:
1 950
Company:
Part Number:
L6924D013TR
Manufacturer:
STMicroelectronics
Quantity:
10 000
L6924D
8.2
8.3
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 I
At the end of the de-glitch time, a detection current I
output for a time of T
V
checked to see if the voltage on the output goes higher than V
mV). If the battery voltage changes from V
it means that no battery is connected to the charger. The T
Equation 26
Figure 22. Battery absent detection flow chart
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 V
PRETH
YES
, a current equal to I
Detect High Absent
Detect Low Absent
BATTERY
ABSENT
V
V
V
V
PRETH
>
>
BAT
BAT
RCH
NO
DETECT
NO
YES
DETECT
. The device checks the voltage at the output. If it is below the
Doc ID 11908 Rev 9
DETECT LOW ABSENT = a I
DETECT HIGH ABSENT = a I
T
I
SINK
DET
IN
= I
PRE CHARGE
is injected in the output capacitor for a T
= 100ms (Typ.)
T
when it exceeds their absolute value (6 V).
Application information: monitoring and protection
INJ
DETECT
= 1mA (Typ.)
FAST CHARGE
PRETH
=
54×
T
MAXCH
to V
10
DETECT
ABS
3
SINK
INJ
and vice versa in a T
is injected for a T
, equal to 1 mA, is sunk from the
DETECT
is sunk for a T
ABS
(the value is V
is expressed by:
DET
DET
from the battery
in the battery
DETECT
DETECT
OPRGTH
, and it is
ENDTH
time,
27/38
-50
.