IP5568

V1.31

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is used as serial port print port output.

FCAP is the drive pin in TXRX scheme, and the battery capacity is 10000mAH by default.

VSET（Battery full voltage selection）

IP5568 sets the battery type by outputting 20uA current on Vset pin and connecting different resistance to

GND, so as to change the threshold value of battery level display, the constant voltage to charge the battery and

the protection voltage. The resistance of Vset external to GND and the set battery type are shown in the table

below

VSET

pin

external

resistance to GND(ohm)

VSET PIN voltage

VSET voltage judgement range

Battery full voltage selection

115k

2.30v

>2.1v

4.20V

82k

1.64v

1.3v~2.1v

4.30V

51k

1.02v

0.6v~1.3v

4.35V

20k

0.40v

0~0.6v

4.40V

VSET pin is used to set the battery full voltage only when the LED mode is displayed; when the nixie tube is

applied, Vset is used as the driving pin of the nixie tube, and the default battery full voltage is 4.2V

NTC function

IP5568 integrates NTC function, which can detect battery temperature and wireless charging coil

temperature. IP5568 has two NTCs, NTC1detects battery temperature and NTC2 detects wireless

charging coil temperature. When IP5568 is working, NTC1and NTC2 pin output 20uA current, and

generate voltage through external NTC resistance. IC internal detects the voltage of NTC1 and NTC2

pin to determine the current battery temperature and wireless charging coil temperature.

R1=120K

ADC

RNTC1=100K

B=3950

NTC1

NTC2

R2=120K

RNTC2=100K

B=3950

NTC1_ADC

NTC2_ADC

20uA

20uA

Figure 9

NTC circuit

In the state of charge:

When NTC1 pin detects that the voltage is 1.96v, it represents low temperature of battery - 10 ℃; when

NTC1 voltage is higher than 1.96v, it stops charging; when NTC1 voltage is lower than 1.85v, it resumes charging.

When NTC1 pin detects that the voltage is 0.64v, it means the battery temperature is 45 degrees; when NTC1

voltage is lower than 0.64v, the charging current is reduced by half; when NTC1 voltage is higher than 0.7V, the

charging current is restored to normal value.