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Revision 1.11
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AS3543 3v2
Data Sheet - D e t a i l e d D e s c r i p t i o n - P o w e r M a n a g e m e n t F u n c t i o n s
Figure 28. Charger States
9.4.2
Soft Charge
If the battery and therefore CHGOUT is below 3V the charger is working in a fixed soft charge mode with the smallest
possible charging current of 55mA and 3.9V charger end voltage. After reaching the 3V level the charger switches to
the register defined mode and sets the programmed charging current and voltage.
9.4.3
End of Charge Detection
For the EOC level 4 presets can be selected. This makes it possible to monitor the charging progress also during con-
stant voltage mode. If the EOC level is reached an interrupt can be generated, but it is also possible to poll the charger
status bits at any time.
9.4.4
Temperature Supervision
This charger block also features a 15uA supply for an external 100k NTC resistor to measure the battery temperature
while charging. If the temperature is too high, an interrupt can be generated. If the battery temperature drops the char-
ger will start charging again. The levels for switching off/on the charger (45/42°C or 55/50°C) can be selected via reg-
ister settings.
If the NTC resistor does not have 100k
its value can be corrected with a resistor in series or in parallel.
9.4.5
Parameter
AVDD27=2.7, TA= 25
o
C, unless otherwise mentioned
Table 26. Charger Parameter
Symbol
Parameter
Condition
Min
Typ
Max
Unit
ICHG (0-7)
Charging Current
BVDD > 2.7V, ICHG > 60mA
INOM
-8%
INOM
+8%
mA
VCHG (0-7)
Charging Voltage
BVDD > 2.7V, end of charge is
true
VNOM
-50mV
VNOM
+30mV
V
VON_ABS
Charger On Voltage IRQ
CHGOUT>3V
3.1
4.0
V
VON_REL
Charger On Voltage IRQ
CHGIN-CHGOUT
170
240
mV
VOFF_REL
Charger Off Voltage IRQ
CHGIN-CHGOUT
40
77
mV
ams
AG
Technical
content
still
valid