L6924D datasheet(29/38 Pages) STMICROELECTRONICS

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L6924D

Application information: monitoring and protection

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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. These pins must never be

connected to the VIN when it overcomes their absolute value (6V).

8.4

Shutdown

The L6924D has a shutdown pin; when the pin is connected to GND, the device is operating.

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

input is dramatically reduced to 60

µA (typ.). In this condition, V

REF is turned OFF.

Figure 23. ST1 and ST2 connection with LEDs Or

µC

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 lower

than the IENDTH

OFF

Stand By mode

When the input voltage goes under VBAT-

50mV

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 is expired

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