STEVAL-ISA076V1 STMicroelectronics, STEVAL-ISA076V1 Datasheet - Page 17

• 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
7.2
7.3
Pre-charge current
The L6924D allows pre-charging the battery with a low current when the battery voltage is
lower than a specified threshold (V
to 10% of the fast-charge current. However it can be adjusted by connecting a resistor from
the I
pin and GND, the current is higher than the default value. The R
Equation 6
Figure 10. I
When R
external reference equal to 1.8 V, V
constant equal to 950. See
The relationship is shown in the equation 7:
Equation 7
Figure 11. I
Pre-charge voltage
If the V
Otherwise, the device offers the possibility to program this value, with a resistor connected
between the V
equation 8:
PRE
PRE
PRE
pin to GND or V
pin is floating, a default value of V
is connected to V
PRE
PRE
PRE
pin connection
pin connection
pin and GND (see
REF
Figure
(see
REF
Doc ID 11908 Rev 9
, the current is lower than the default value. V
Figure
R
PRETH
R
11.
BG
PRE
PRE
L6924D
L6924D
L6924D
L6924D
Figure
is the internal reference equal to 1.23 V and K
=
=
). The Pre-charge current has a default value equal
10). When the resistor is connected between I
I
R
V
K
PRECH
V
PRG
BG
Applications information: charging process
12). In this case, the R
PRE
PRETH
REF
V
−
I
I
I
I
PRE
PRE
PRE
PRE
BG
−
−
I
V
K
PRECH
R
is set, equal to 2.8 V (V
V
BG
PRE
PRG
BG
V
V
REF
REF
PRE
VPRE
value is given by:
is given by the
PRETHDefault
REF
is the
PRE
17/38
PRE
).
is a