M62241 データシートの表示（PDF） - MITSUBISHI ELECTRIC

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M62241

SINGLE CHIP BATTERY CHARGER CONTROL IC

MITSUBISHI ELECTRIC  

MITSUBISHI(Standard Linear IC)

M62241FP

SINGLE CHIP BATTERY CHARGER CONTROL IC

7. Detection of battery connection /battery temperature

This block detects the battery connection and the battery temperature by the input voltage dividing

between thermistor inside battery package and resistances outside REFIN pin.

Each referential voltage for detection is set by dividing REFOUT pin voltage by inside resistances.

The dividing circuits are grounded to THS pin connected directly to - terminal of battery

to prevent input voltage of TH pin from changing by the current of external circuit.

<1> Battery connection detection

The battery connection is recognized in case the resistance of the thermistor connected to

TH pin is less than the following:

Thermistor resistance(Rth): less than approximately 100kΩ

Detecting timing is as follows:

60msec * 2 times =120msec(Foc=3.41KHz)

<2> Battery temperature detection

This block controls to switch charging after detecting the battery temperature by the dividing

ratio between resistance pulled up and thermistors.

Detecting timing is as follows:

60msec * 2 times =120msec(Foc=3.41KHz)

For further details,read the 20 clause.

8. Over discharge detection block

In case the voltage majored before starting to charge is less than the detection voltage,the over

discharge mode is taken over before waiting.It continues to wait until the battery charges from

external circuit and the charge mode is taken over after the voltage becomes more than the detection

voltage.The differential gain output voltage of the battery is majored at this block.

The referential voltage for detecting is set by the dividing ratio between resistors connected to the

REFOUT pin.

The Over Discharge detection voltage (V Blow) is 4.0V.

This detection is disregarded during charging.

The detection timing is as follows:

300msec *4 times = 1.2sec. (foc=3.41kHz)

9.Over Voltage detection block

NG mode is taken over ,in case the voltage majored before starting to charge is more than the

following voltage.The referential voltage for detecting is REFOUT output voltage.

The over detection voltage(Vbhigh) is VREFOUT.

This detection is disregarded during charging.

The detection timing is as follows:

300msec *4 times = 1.2sec. (foc=3.41kHz)

10 The charge completion detection block

The charge completion mode is taken over in case the charge current in charge mode is less than the

detection current.

This detection depends on the gained current output.

The referential voltage for detection is set by the dividing ratio between resistors connected to ADJ3

pin.This detection is discharged except during charging.

The detection timings is as follows:

600msec *8 times = 4.8sec. (foc=3.41kHz)

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9907

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