Datasheet

L6924D Additional applications information
Doc ID 11908 Rev 9 33/38
Table 7. Demonstration board components description
Name Value Description
R1 1k Pull up resistor. To be used when the ST1 is connected to a LED.
R2 1k Pull up resistor. To be used when the ST1 is connected to a LED.
R3 1k Pull up resistor. Connected between V
REF
and TH pin.
R4 3k3
End of charge current resistor. Used to set the termination current and, as a “Gas
Gauge” when measuring the voltage across on it.
R5 24k Fast-charge current resistor. Used to set the charging current.
R6 N.M.
V
PRETH
resistor. Used to set programmable pre-charge voltage threshold. If not
mounted, the V
PRETHDefault
, equal to 2.8V, is set.
R7 N.M.
I
PRETH
resistor. Used to set the programmable pre-charge current threshold below
the default one. If not mounted, the I
PRETHDefault
is set.
R8 68k
I
PRETH
resistor. Used to set the programmable pre-charge current threshold above
the default one. If not mounted, the I
PRETHDefault
is set.
R9 470R
If a NTC is not used, a half value of R3 must be mounted to keep the TH voltage in
the correct window.
R10 N.M.
It has the same function of R6. Moreover, if it is replaced with a short-circuit, when
J5 is closed, the timer is reset (falling edge).
C1 1µF Input capacitor.
C2 10nF T
MAX
capacitor. Used to set the maximum charging time.
C3 4.7µF Output capacitor.
C4 1nF V
REF
filter capacitor.
LD1 GREEN ST1 LED.
LD2 RED ST2 LED.
J1 ST1 jumper. Using to select the LED or the external µC.
J2 ST2 jumper. Using to select the LED or the external µC.
J3
SD jumper. If open, the device is in shutdown mode; when closed, the device starts
to work.
J4 V
OPRG
jumper. If closed, the 4.2V output voltage is set; if open, the 4.1V is set.
J5 V
PRE
jumper. If closed with R10 in short-circuit with GND, resets the timer.