L6924U datasheet(29/38 Pages) STMICROELECTRONICS

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L6924U

Application information: monitoring and protection

29/38

8.3

Status pins

To indicate various charger status conditions, there are two open-collector output pins, ST1

and ST2. These status pins can be used either to drive status LEDs, connected with an

external power source, by a resistor, or to communicate to a host processor.

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, V

REF 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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