L6924UTR datasheet(28/37 Pages) STMICROELECTRONICS

部件名	L6924UTR

功能描述	USB compatible battery charger system with integrated power switch for Li-Ion/Li-Polymer

PDF	37 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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28 / 37 page

Application information: monitoring and protection

L6924U

28/37

Doc ID 14716 Rev 2

8.4

Shutdown

The L6924U has a shutdown pin; when the pin is connected to GND, the device is operating.

When the pin is left floating, the device enters the shutdown mode, the consumption from

the input is dramatically reduced to 60 µA (typ.). In this condition, VREF is turned OFF.

Figure 21.

ST1 and ST2 connection with LEDs or microcontroller

Table 6.

Status LEDs Indications

Charge condition

Description

ST1

ST2

Charge in progress

When the device is in pre-charge or fast-

charge status

OFF

Charge done

When the charging current goes below the

IENDTH

OFF

Stand by mode

When the input voltage goes under

VBAT + 50 mV

OFF

Bad battery temperature

When the voltage on the TH pin is out of

the programmable window, in accordance

with the NTC or PTC thermistor

Battery absent

When the battery pack is removed

Over time

When TMAXCH or TMAXPRECH expires

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