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STBC21 数据表(PDF) 25 Page - STMicroelectronics

部件名 STBC21
功能描述  LI battery charger with thermal regulation
PDF  54 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

STBC21 数据表(HTML) 25 Page - STMicroelectronics

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STBC21
Detailed description
Doc ID 023256 Rev 1
25/54
The alarms are reported by two different LEDs driven from the high side with 10 mA current
capability, as reported in
Figure 15. The LED current is not internally limited.
Figure 15.
LEDs control circuit
See
Appendix E for possible LED configurations.
As regards RLED calculation, taking into account ILED = 10 mA and VFLED = 2 V, we obtain:
Equation 3
5.8
Reversed battery polarity protection
The STBC21 includes a reversed battery polarity protection to prevent damage due to an
incorrect insertion of the battery in the cradle.
If the battery is able to supply 2 mA, charge doesn't start and no alarm is set.
If the battery is protected against overvoltage, undervoltage, etc. and it is in protection mode
(represented as an open circuit) it is not able to supply 2 mA. In this condition, the battery
connection detection alarm is set. Even in this case the charge does not start.
If the battery is not protected against overvoltage, undervoltage, etc. and battery voltage is
below 1.0 V, battery connection detection is unable to start. In this case, for a time
corresponding to TIMER-4 (16 sec), the battery is discharged with a pre-charge current. But
when TIMER-4 elapses the battery alarm is flagged and the discharge is stopped.
5.9
Temperature protection
The STBC21 has a further protection when the dye temperature reaches 115 °C. In this
condition the charge is stopped and restarts after the temperature decreases to 95 °C.
During this “idle” state, LEDs continue to show “charge ongoing” if the charger was in
charge, “end of charge” if the charger was in termination phase and the timers keep on
AM10424v 1
V
CC
OSC
ON/0.625/
/2.5/3/4
30/50/80/100
ON duty
2bit
9bit
3bit
Charging
MODE
LED
Control
LED
display
LED
display
flickering
LED
display
ON duty
7mode
ON(100%)
CK
10mA
10mA
LDO
2.9V
V
REF
OSC
ON/0.625/2/2.5/3/4
30/50/80/100
ON duty
LED
Control
2.9 V
LDO
Ω
=
−
=
−
=
90
01
.
0
)
2
9
.
2
(
I
)
VF
V
(
R
LED
LED
REF
LED



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