IP5328P

V1.2

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VSET (battery type set)

Battery type can be set by the VSET pin, accordingly, the battery level display threshold voltage and Constant

Voltage charging threshold voltage are changed at the same time. VSET resistor and battery type are listed below:

VSET resistor (Kohm)

Battery type

NC

4.2V

120

4.35V

68

4.4V

10

4.5V

NTC

IP5328P support NTC function used for battery temperature detection. NTC pin output 20uA

current then detect the voltage on NTC pin to determine the present battery temperature.

R1=82K

RNTC=100K

B=4250

VL=1.52V/1.44V

NTC

COMP

HT

LT

V=20uA*(R1//RNTC)

VH=0.43V

MT

VL=0.56V

C=100nF

Figure 5

Battery NTC comparator

Under charging state:

Voltage on NTC pin is 1.44V meaning the battery temperature is low -10 centigrade, stop charging the battery;

Voltage on NTC pin is 0.56V meaning the battery temperature is medium 45 centigrade, charging current half

down;

Voltage on NTC pin is 0.43V meaning the battery temperature is medium 55 centigrade, stop charging the

battery;

Under discharging state:

Voltage on NTC pin is 1.52V meaning the battery temperature is low -20 centigrade, stop discharging;

Voltage on NTC pin is 0.43V meaning the battery temperature is high 55 centigrade, stop discharging;

If NTC is not needed, NTC should serial a 51kOhm resistor to ground, do not float NTC or tie it to ground

directly.

VREG

VREG is a normally opened 3.3V LDO, load capacity is 30mA.