AS3543 datasheet(41/92 Pages) AMSCO

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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

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%

VCHG (0-7)

Charging Voltage

BVDD > 2.7V, end of charge is

true

VNOM

-50mV

VNOM

+30mV

VON_ABS

Charger On Voltage IRQ

CHGOUT>3V

3.1

4.0

VON_REL

Charger On Voltage IRQ

CHGIN-CHGOUT

170

240

VOFF_REL

Charger Off Voltage IRQ

CHGIN-CHGOUT

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