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[v1-11] 2016-Dec-14

AS3701 − Detailed Description – Power Management Functions

Figure 33:

NTC Supervision Configuration

Note(s):

1. If no NTC supervision is selected, all NTC relevant bits are ineffective

2. AS3701B only

NTC Resistor

Depending on the used resistor value of the NTC (10k or 100k)

the internal NTC current (150

μA for 10k or 15μA for 100k) can

be selected via ntc_10k [ChargerSupervision].

High/Low Temperature

The battery high temperature supervision is controlled with the

bit ntc_high_on [ChargerSupervision] and this feature is enabled

per default. If the temperature is higher than 45°C or 60°C

(depending on ntc_mode [ChargerSupervision]) the flag temp_

cond [ChargerStatus1] will be set and the charger will stop

operation. When the battery temperature drops and the

voltage on NTC pin rises above VBATTEMP_HIGH_OFF, the flag

temp_cond will be reset and the charger will continue with the

charging again.

The battery low temperature supervision is controlled with the

bit ntc_low_on [ChargerSupervision] and this feature is disabled

per default. If the temperature is lower than 0°C the flag temp_

cond [ChargerStatus1] will be set and the charger will stop

operation. When the battery temperature rises and the voltage

on NTC pin falls below VBATTEMP_LOW_OFF, the flag temp_cond

will be reset and the charger will continue with the charging

again.

The detection of a high or low battery temperature can also be

indicated with a dedicated interrupt mask bit bat_temp_m

[InterruptMask2].

For the high and low temperature supervision, a temperature

hysteresis is included to avoid an oscillation of the charger.

The supply for the NTC will be on when either the ntc_high_on

or the ntc_low_on bit is set, no matter if a charger is detected

or not. Therefore the battery temperature supervision can be

used for charging mode and also for discharging mode.

NTC_input

NTC Supervision Configuration

No NTC supervision (1)

XIRQ_NTC pin

GPIO3 pin (2)

GPIO4 pin (2)

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