M62241FP データシートの表示（PDF） - Renesas Electronics

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M62241FP

Single Chip Battery Charger Control IC

Renesas Electronics 

M62241FP

6. Output Current & Voltage Amplifier Block

The voltage between GND and IDET pin is available to several detector after amplified. The gain of this amplifier is 13.

The gain range: 0 to 2 A (Input voltage 0 to 0.2 V) → 0.2 to 2.6 V

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 in side 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 100 kΩ

Detecting timing is as follows:

60 ms × 2 times = 120 ms (foc = 3.41 kHz)

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:

60 ms × 2 times = 120 ms (foc = 3.41 kHz)

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 4.0 V.

This detection is disregarded during charging.

The detection timing is as follows:

300 ms × 4 times = 1.2 s (foc = 3.41 kHz)

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:

300 ms × 4 times = 1.2 s (foc = 3.41 kHz)

REJ03F0240-0200 Rev.2.00 Jun 16, 2008

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