STBC21 datasheet(14/54 Pages) STMICROELECTRONICS

14 / 54 page

Detailed description

STBC21

14/54

Doc ID 023256 Rev 1

Figure 4.

Charging process flowchart

Two outputs can be used to detect the status of charge. The functionality of these two pins

can be customized in NVM as outlined in

Appendix E & Appendix F. This is to allow the final

customer to have different kinds of information depending on whether the output is ON, OFF,

or flickering. The flickering frequency is programmable both in frequency and duty cycle (see

Appendix E & Appendix F).

Note:

The device functionality is not guaranteed if the parameters are modified in NVM during the

charging cycle.

5.1

Operation mode

The STBC21 can work in standalone or driven by a microcontroller. If it works in standalone,

all device parameters are those stored in NVM. Otherwise, if it works driven by a

microcontroller, it is the microcontroller itself to program through I²C (SCL and SDA pins) the

device parameters.

AM10415v 1

Insert Ba ery

Ba ery connec on

detec on at

beginning of charge

Pre-Charge Mode

VBAT > 3.0V

YES

VBAT < 1.0V

0V-Charge Mode

YES

Ba ery alarm

TIMER-4

elapsed

VBAT > 1.0V

Ba ery alarm

TIMER-1

elapsed

YES

Fast

-Charge Mode

in constant current

YES

VBAT < VFLOAT

Termina on

(without

Auto-recharge)

TIMER-2

elapsed

IBAT < ISET3

TIMER-2

elapsed

YES

Termina on

(without

Auto-recharge)

Fast

-Charge Mode

in constant voltage

YES

Safe charge

OFF

(TIMER-3=0 min)

Auto Recharge

YES

Safe charge

TIMER-3

elapsed

Auto Recharge

YES

TIMER-4 ON

TIMER-1 ON

TIMER-2 ON

TIMER-3 ON

VBAT < 3.9V

Ba ery Connec on

Detec on

at the End of Charge

Ba ery Connec on

Detec on

at the End of Charge

Ba ery Connec on

Detec on

at the End of Charge

Ba ery Connec on

Detec on

at the End of Charge

Termina on

(without

Auto-recharge)

Termina on

(without

Auto-recharge)

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