AS3611 datasheet(11/26 Pages) AMSCO

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AS3610/11

Datasheet - D e t a i l e d D e s c r i p t i o n

Figure 14. Detailed Block Diagram

8.1.2

Charging Cycle Description

8.1.2.1

Charge adapter detection

The charger uses an integrated detection circuit to determine if an external charge adapter has been applied to the VBUS pin. If the VBUS

voltage exceeds the battery voltage at pin VBUS by VCHDET the ChDet bit in the ChargerStatus1 register will be set. That detection de-bounce

time is approx. 300msec for rising ChDet and approx. 30msec for falling ChDet signal (debounce_timer=00b).

8.1.2.2

Low current soft charging

When the charger is detected and enabled (chg_en=1), no stop charging condition is active and the battery voltage is below VSOFT, the charging

cycle is started with soft_charging. In that mode the charger is acting as a linear charger down to VBAT. With a current of ISOFT

8.1.2.3

(Trickle) Pre-charging

If the battery voltage exceeds VSOFT, but is below VTRICKLE, and the bit prechg_en is set, the trickle charging is started.

In that mode the charging current is defined by the external resistor on pin I_TERM or the input current limit if e.g. 100mA input current limit is

active.

8.1.2.4

Constant current charging

If the battery voltage is above VTRICKLE and below VEOC (or above VSOFT if prechg_en=0) the charging current is defined by the resistor on pin

I_SET. In addition the current can be reduced by I2C with the register setting of constcurr. (AS3610 only)

8.1.2.5

Constant voltage charging

Constant voltage charge mode is initiated, if the battery voltage has reached the VEOC threshold.

The charge current is monitored during constant voltage charging. It will be decreasing from its initial value during constant current charging and

eventually drop below the value set by the resistor on pin I_TERM. If the measured charge current is less than or equal to ITERM, the charging

cycle is terminated and EOC is set. The termination current may be reduce by a factor of 2 by setting the eoccurr bit to 1.

AS3611 датащи(PDF) 11 Page - ams AG