STBC21 datasheet(20/54 Pages) STMICROELECTRONICS

20 / 54 page

Detailed description

STBC21

20/54

Doc ID 023256 Rev 1

Figure 9.

Battery temperature alarm during charge flowchart

The chip also includes an NVM to allow the temperature thresholds above to be

programmable few times by the battery manufacturer.

The temperature thresholds are sensed by the NTC inside the battery pack. A reference

voltage is properly partitioned to translate the variable resistance in a variable voltage as

shown in

Figure 10.

Temperature detector schematic

AM10420v 1

Ba ery Temperature

Alarm Detecon /

During charge

Baery Temperature >

60°C

Baery Temperature < -

2°C

Charge

Baery Temperature

Alarm occurrence

Stop charging

Timers keep coun ng

Alarm asserons =2 mes

Charge on going

LED SET

Ba ery

removed

YES

0°C < Baery Temperature < 43°C

Charging Comple on

LED SET

Ba ery Unistalla on

LED SET

YES

Restart charging from the

interrupted point

END

Baery Temperature

> 60°C

YES

Increase

alarm counter

Charge on going

LED SET

Ba ery Temp Alarm /

During charge

LED SET

AM10421v 1

STBC21

TEMP

RPART2

RPART1

NTC

VREF

BATTERY PACK

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