STEVAL-ISA076V1 STMicroelectronics, STEVAL-ISA076V1 Datasheet - Page 27

• Manufacturer Part Number: STEVAL-ISA076V1
• Description: BOARD DEMO BATT CHRGR L6924D
• Manufacturer: STMicroelectronics

Specifications of STEVAL-ISA076V1

• Design Resources: STEVAL-ISA076V1 Bill of Materials STEVAL-ISA076V1 Gerber Files STEVAL-ISA076V1 Schematics
• Featured Product: STM32 Cortex-M3 Companion Products
• Main Purpose: Power Management, Battery Charger
• Embedded: No
• Utilized Ic / Part: L6924D
• Primary Attributes: 1 Cell- Li-Ion / Li-Pol, 4.1V or 4.2V @ 1A, 12V Input
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Secondary Attributes: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-11036

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
.