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1.01

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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

8.1.3

Charger States

8.1.4

Stop charging conditions

There are multiple safety features implemented that trigger a stop_charging condition:

These are the following:

- Timeout timer expired (If ch_timeout>0 and charging time has been exceeded). Can be reset by unplugging the charger, setting chg_en=0

or writing charging_tmax=0

- VBUS_UVLO reached

- Die temp>140deg (ov_temp_140 set)

8.1.5

Battery presence indication and operation without battery

on the load on VBAT and the capacitor on VBAT this might take some milliseconds to 1 second. The charger will restart charging

(ConstantCurrent charging) after 100msec.

The 100msec dead time is necessary to get a battery oscillation frequency of below 10Hz, if there is no battery present and NTC battery

detection is not enabled.

If No_bat_det=1 and the NOBAT detection timer is below 2 seconds after reaching EOC state, and this happens 2 times in serial, the state

“operation without battery” is entered.

If the nobat_ntc_det bit is set the looping described above will be stopped and a NTC detection is started.

A pull up current of 0.5uA is applied to NTC. If the NTC voltage is above 1.8V, the state machine stays in the no bat state. If the BATTEMP

voltage is below 1.8V, a charging cycle is restarted.

8.1.6

VBUS undervoltage regulation

If the voltage on VBUS drops below Vchg_min the current is regulated down to avoid overloading of the input source.

8.1.7

Charger overvoltage protection