LP3910 datasheet(32/72 Pages) TI1

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Li-Ion Cell

USBPWR

VDD

VBATT

CHG_DET

Adapter

USB

LP3910

SNVS481M – NOVEMBER 2006 – REVISED DECEMBER 2015

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Feature Description (continued)

Figure 54. Switches for USB Charging Path

8.3.4.2 Charge Status Indication

Two LEDs connected to the LP3910 are used to indicate the status of the charging. The CHG pin is connected to

a red LED that is enabled when an external power source is connected and the battery is charging. The second

STAT pin is connected to a green LED. When the battery charging transitions from CC to CV mode, then the

green LED is blinking with a 50% duty cycle and a period of 1 second. When the battery is fully charged, then the

green LED is always on.

Both LEDs are off when there is no external power connected.

Table 5. Truth Table for the LED Status Indicators

CONDITION

RED LED

GREEN LED

No Charger or USB

OFF

Charger off

OFF

Pre-Qualification

OFF

Constant Current CC

OFF

Constant Voltage CV

50% duty cycle

EOC / Top-OFF charging

Charge cycle complete

ERROR (Battery Temperature, Thermal shutdown)

50% duty cycle

OFF

Safety Timer Expired

50% duty cycle

OFF

50% duty cycle indicates the LED is pulsed on and off for equal times at a frequency of 1 Hz.

The RED pin and GREEN pin are connected to a regulated driver to ensure that the brightness is independent

from the external power. The LEDs need to be connected between the CHG and STAT pins and GND.

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