AS3701 datasheet(28/110 Pages) AMSOSRAM

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ams Datasheet

Page 27

[v1-11] 2016-Dec-14

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AS3701 − Detailed Description – Power Management Functions

Stop Charging Conditions

There are multiple safety features implemented triggering a

stop_charging condition.

These are the following:

• Battery temperature is too high: If ntc_high_on

[ChargerSupervision] = 1 and the voltage at pin NTC

(GPIO3, GPIO4 or XIRQ_NTC) is below VBATTEMP.

• Battery temperature is too low: If ntc_low_on

[ChargerSupervision] = 1 and the voltage at pin NTC

(GPIO3, GPIO4 or XIRQ_NTC) is above VBATTEMP.

• Charging timeout timer expired: If ch_timeout

[ChargerConfig2] > 0 and charging time has been

exceeded. (Can be reset by unplugging the charger,

setting bat_charging_enable [ChargerControl] = 0 or

writing charging_tmax [ChargerConfig2] = 0)

• Die temperature > 140°C (ov_temp_140

[OvertemperatureControl] is set)

• Reset is initiated (each Reset reason forces a stopping of

the charging)

Battery Presence Indication

After EOC state is reached, a timer for NOBAT detection is

started. If there is no battery present, the VBAT voltage will drop

to VRESUME. Depending on the load on VBAT and the capacitor

on VBAT this might take some milliseconds to 1 second. If

AutoResume [ChargerControl] is enabled, the charger will restart

charging (Constant Current Charging) after 100ms delay.

The 100ms dead time is necessary to get a battery oscillation

frequency below 10Hz, if there is no battery present.

If the NOBAT detection timer is below 2 seconds after reaching

the EOC state, and this happens 2 times in serial, the bit NoBat

[ChargerStatus1] is set. If a battery is inserted, the bit will be

reset after the timer exceeds the 2 seconds.

NTC Supervision

Configuration

The AS3701 also features a supply for an external NTC resistor

to measure the battery temperature while charging. For

AS3701A, the pin XIRQ_NTC can be used as the NTC input pin,

whilst AS3701B additionally offers the GPIO3 and GPIO4. With

the bit NTC_input [ChargerSupervision] the NTC Supervision can

be configured.

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