L6924D datasheet(32/38 Pages) STMICROELECTRONICS

32 / 38 page

Additional applications information

L6924D

32/38

Figure 27. Demoboard schematic

Table 7.

Demo board components description

Name

Value

Description

Pull up resistor. To be used when the ST1 is connected with a LED.

Pull up resistor. Connected between VREF and TH pin.

3K3

End of Charge current resistor. Used to set the termination current and, as a

“Gas Gauge” when measuring the voltage across on it.

24K

Fast-charge current resistor. Used to set the charging current.

N.M.

VPRETH resistor. Used to set programmable pre-charge voltage threshold. If

not mounted, the VPRETHDefault, equal to 2.8V, is set.

N.M.

IPRETH resistor. Used to set the programmable pre-charge current threshold

below the default one. If not mounted, the IPRETHDefault is set.

68K

IPRETH resistor. Used to set the programmable pre-charge current threshold

above the default one. If not mounted, the IPRETHDefault is set.

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).

1uF

Input capacitor.

10nF

TMAX capacitor. Used to set the maximum charging time.

4.7uF

Output capacitor.

1nF

VREF filter capacitor.

LD1

GREEN

ST1 LED.

SHDN GND V

OPRG

PRE

PRG

PRE

PRG

END

OSNS

OUT

REF

INSNS

ST1

ST2

L6924D

CHARGER

BATTERY

Vref

LD1

LD2

µC

NTC

R10

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