STBC21 datasheet(16/54 Pages) STMICROELECTRONICS

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Detailed description

STBC21

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Doc ID 023256 Rev 1

Figure 5.

Battery connection detection flowcharts

5.3

Start of charge

The STBC21 start of charge is subject to three variables: input voltage, battery connection

and battery temperature. The detection of these variables is filtered with different deglitching

as reported in

Table 7:

AM10416v 1

Ba ery connec on detec on at the End of Charge

Insert ba ery

Pin TEMP

connected

Force IDETECT to

ba ery and start TDETECT

Start charging

YES

Wait for 400msec

(TWAIT)

VBAT>3.9V

TDETECT<300ms

Sink ISINK from

ba ery and start TSINK

VBAT<3.0V

SINK<100ms

YES

Ba ery alarm

YES

TDETECT ≥300ms

YES

VBAT>3.9V

YES

Start charging

Ba ery

removed

Ba ery unistalla on

LED SET

YES

END

Sink ISINK from

ba ery and start TSINK

VBAT<3.0V

TSINK<100ms

YES

Termina on

Ba ery alarm

Start Termina on

Ba ery

removed

Ba ery unistalla on

LED SET

YES

END

Ba ery connec on detec on at Beginning of Charge

STBC21 数据表(PDF) 16 Page - STMicroelectronics

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