STBC21 Datasheet, PDF (16/54 Pages) STMicroelectronics – LI+ battery charger with thermal regulation

Detailed description
STBC21
Figure 5. Battery connection detection flowcharts
Insert baƩery
Start TerminaƟon
Wait for 400msec
(TWAIT)
Sink ISINK from
baƩery and start TSINK
Pin TEMP
NO
connected
YES
Force IDETECT to
baƩery and start TDETECT
VBAT<3.0V
NO
&
TSINK<100ms
YES
BaƩery alarm
TerminaƟon
VBAT>3.9V
YES
&
TDETECT<300ms
NO
TDETECT ≥300ms
NO
YES
VBAT>3.9V
NO
YES
Sink ISINK from
baƩery and start TSINK
Start charging
BaƩery
NO
removed
YES
BaƩery unistallaƟon
LED SET
END
BaƩery connecƟon detecƟon at the End of Charge
VBAT<3.0V
NO
&
T_SINK<100ms
YES
BaƩery alarm
Start charging
BaƩery
NO
removed
YES
BaƩery unistallaƟon
LED SET
END
BaƩery connecƟon detecƟon at Beginning of Charge
AM10416v 1
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:
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Doc ID 023256 Rev 1