STBC02 datasheet(21/39 Pages) STMICROELECTRONICS

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STBC02

Functional pin description

DocID029261 Rev 2

21/39

6.9

LDO

LDO output voltage pin. The regulated voltage (it can be 3 V, 3.1 V, or 3.3 V) depends on

the selected STBC02 order code. The maximum current capability is anyhow 150 mA.

A 1 µF ceramic bypass capacitor must be connected to GND.

6.10

WAKE-UP

Wake-up input pin. To restore normal operations of the STBC02, so to exit from a

shutdown condition, connect the WAKE-UP pin to the battery voltage. The STBC02 is

enabled to operate in normal conditions again, only if the battery voltage is higher than

VODCR (3 V). A deglitch delay is implemented to prevent unwanted false operations. The

above-described WAKE-UP pin functionality is disabled when a valid VIN voltage source is

detected. The pin has an internal 50 kΩ pull-down resistor.

6.11

CHG

Active low, open drain charging/fault flag output pin. The CHG provides status information

about VIN voltage level, battery charging status and faults by toggling at different

frequencies as reported in the table below.

Table 8: CHG pin state

Device state

CHG pin state

Note

Not valid input (VIN <

VBAT or VIN > VINOVP

or VIN < VINUVLO)

High Z (high by

external pull-up)

In case of synchronous alarm events, the highest toggling

frequency has higher priority.

Example: NTC warning and EOC are concurrent events.

NTC warning, signaled by toggling CHG at 16.2 Hz is the

only signal available till the battery temperature goes back

to a safe range (0 °C to 45 °C). If an EOC condition is still

present then a 4.1 Hz toggling signal is present.

Valid input (VIN

>VINUVLO, VIN <

VINOVP, VBAT < VIN

and CEN low)

Low

End-of-charge

(EOC)

Toggling 4.1 Hz

(until USB is

disconnected)

Charging phase (pre

and fast)

Toggling 6.2 Hz

Overcharge fault

Toggling 8.2 Hz

Charging timeout

(pre-charge, fast

charge)

Toggling 10.2 Hz

Battery voltage

below VPRE after the

fast charge starts

Toggling 12.8 Hz

Charging thermal

limitation (thermal

warning)

Toggling 14.2 Hz

Battery temperature

fault (NTC warning)

Toggling 16.2 Hz

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