L6924U datasheet(32/38 Pages) STMICROELECTRONICS

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Additional applications information

L6924U

32/38

Figure 25.

Demonstration board schematic

Table 7.

Demonstration board components description

Name

Value

Description

24 k

Ω AC mode fast-charge current resistor. Used to set the charging current in AC mode.

24 k

Ω

USB mode fast-charge current resistor. Used to set the charging current in USB

mode.

3.3 k

Ω

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

a “gas gauge” when measuring the voltage across on it.

1 k

Ω

Pull up resistor. Connected between VREF and TH pin.

1 k

Ω

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

1 k

Ω

Pull up resistor. To be used when the ST2 is connected with a LED.

RT1

470

Ω

If a NTC is not used, a half value of R4 must be mounted to keep the TH voltage in

the correct window.

µF

Input capacitor.

4.7

µF Output capacitor.

10 nF

TMAX capacitor. Used to set the maximum charging time.

1 nF

VREF filter capacitor.

GREEN ST1 LED.

RED

ST2 LED.

ST2 jumper. Using to select the LED or the external microcontroller.

ST1 jumper. Using to select the LED or the external microcontroller.

SD jumper. If open, the device is in SD mode; when closed, the device starts to

work.

Low power/ high power USB mode selection jumper.

AC/USB mode selection jumper.

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