Operation description

STBC03

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DocID029927 Rev 2

8.3

Battery temperature monitoring

The STBC03 integrates all the needed blocks to monitor the battery temperature through

an external NTC resistor. The battery temperature monitoring is enabled only during the

battery charging process, in order to save power when the system is supplied from the

battery.

When the battery temperature is outside the normal operating range (0-45 °C), the

charging process is halted, an alarm signal is activated (the CHG pin toggles at 16.2 Hz)

but the charging timeout timers are not stopped.

If the temperature goes back to the normal operating range, before the maximum charging

time has elapsed, the charging process is resumed and the alarm signal is cleared.

In case of the charging timeout expires and the temperature is still outside the normal

operating range, the charging process is stopped but it can be still restarted using the CEN

pin.

Both temperature thresholds feature a 3 °C hysteresis. The battery temperature monitoring

= 10 kΩ and ß = 3370

(Mitsubishi TH05-3H103F). If an NTC thermistor is not used, 1

0 kΩ resistor must be

connected to ensure the proper IC operation.

8.4

Battery overcharge protection

The battery overcharge protection is a safety feature, active when a valid input voltage is

overcharge condition be detected, the current path from the input to the battery is opened

and a fault signal is activated (the CHG pin toggles at 8.2 Hz). When the battery voltage

8.5

Battery over-discharge protection

The battery over-discharge protection is a safety feature enabled only when no valid input

system are powered off from the battery, an over-discharge of the battery itself is avoided.

the STBC03 turns off and current sunk from the battery is reduced to less than 50 nA.

When a valid input voltage source is detected, while the battery is in an over-discharge

state, the STBC03 charger, SYS and LDO outputs are enabled. This condition persists until

any other disconnection of a valid input voltage source brings back the STBC03 to a

battery over-discharge state.

8.6

Battery discharge overcurrent protection

When the STBC03 is powered off from the battery connected to the BAT pin, a discharge

overcurrent protection circuit disables the STBC03 if the current sunk from the battery is in

The presence of a valid input voltage source or triggering the WAKE-UP input pin, allows

normal operating conditions to be restored.

8.7

Battery fault protection

The STBC03 features a battery fault protection. The STBC03 charger is stopped if the

battery voltage remains below 1 V for at least 16 seconds.