AS3715 datasheet(45/160 Pages) AMSCO

45 / 160 page

ams Datasheet, Confidential

Page 45

[v1-00] 2014-Sep-10

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AS3715 − Detailed Description – Power Management Functions

Figure 44:

Charger States

Charger States Diagram: Shows a full charging cycle with the corresponding states.

Stop Charging Conditions

There are multiple safety features implemented that trigger a

stop_charging condition:

These are the following:

• Battery temperature too high/low. If ntc_on=1 and

voltage at pin NTC is below/above VBATTEMP threshold.

•Timeout timer expired (If ch_timeout>0 and charging time

has been exceeded. (Can be reset by unplugging the

charger, setting bat_charging_enable=0 or writing

charging_tmax=0)

• VUSB over-voltage detected

• Die temp>140deg (ov_temp_140 set)

• All reset reasons

External Charger

at pin VUSB

5.5V max

4.5V

Battery Voltage

(VBAT )

Charging

Current

Regulator

Voltages

XRES

after enabling the charger

serial communication possible

t (not to scale )

60mA – 240mA

350mA – 1500mA

2.9V

-3.3% or -5.6%

Trickle Current

Constant Current

Constant Voltage

EOC

Resume

ICHGOFF

1.8V

Soft Charge

22mA

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