MM1433 查看數據表（PDF） - Mitsumi

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MM1433

Lithium-Ion Battery Charge Control (1 to 2 cells)

Mitsumi 

MITSUMI

Lithium-Ion Battery Charge Control (1 to 2 cells) MM1433

outputs on the TP pin. Referring to the data sheet “OSC CR setting reference materials,” when T = 1.77ms, a

waveform with cycle of approximately 1.8s is output.

· Full charge timer operation can be verified by Pin 4 (TP2) high/low switching.

The TP2 pin signal inverts at the 12th stage of the full charge timer binary counter (total 23 stages) and

outputs on the TP pin. Referring to the data sheet “OSC CR setting reference materials,” when T = 1.77ms, a

waveform with cycle of approximately 7.2s is output.

· The blinking period of the LED connected to pin 22 is determined by the internal timer. See the "OSC CR

Settings" on the data sheet for the timer settings.

4. Checking the End of Charging

· For full charge detection, after the full charge delay time elapses, the open collector NPN transistor inside Pin

22 (LED R) goes OFF, and the open collector NPN transistor inside Pin 21 (LED G) goes ON. This can be

verified by a pull-up connection of Pin 22 (LED R) to a red LED and of Pin 21 (LED G) to a green LED via

resistors. The red LED should be out and the green LED should be lit.

5. Checking Disabling of Charging

· In the case of the following cases in which charging is disabled, the open collector NPN transistors at pin 21

(LED G) and pin 22 (LED R) remain OFF. The LEDs connected to pins 21 and 22 will not turn on.

1) When the battery is not connected correctly.

2) When the AC adapter is not connected correctly, or the voltage output by the AC adapter is less than

VADPL or higher than VADPH.

· If charging is disabled because the charger is faulty, the voltage at pin 20 (Vout) switches from HIGH level

(pin 18 voltage to 0.5[v] max.) to LOW level (0.5[V] max.). You can check if the charger is faulty by monitoring

this voltage.

3) When battery temperature is outside the charging start temperature range.

6. Recharging from Full Charge

· Once charging ends as a result of the full-charge detection operation and the battery voltage drops as a

result of it being used and simply by its own natural discharge, recharging starts when the recharge detection

delay timer times out after the voltage drops to the recharge detection voltage.

· See the "OSC CR Settings" on the data sheet for the recharge detection delay time.

· There is no re-charging detection function for rank B.

7. Recovery from Charge-Disabled State

· The following conditions apply before recovery can be implemented from the charge-disabled state:

1) Disconnect and then reconnect the charger.

2) Disconnect and then reconnect the battery.

3) Set pin 2 (RESET) to the HIGH RESET pin input voltage, then return it to the LOW RESET pin input voltage.

8. Other States

· If power is supplied to MM1433 when a battery is not connected, the red LED may immediately start blinking

(red LED blinking cycle is higher than the setting value). This is because voltage that is not within the

temperature abnormality range detected by Pin 12 (TDET pin) is impressed, and Pins 13 and 14 (BAT 1, 2)

oscillate while they are open. In IC operating state, the oscillation occurs because BAT pin impedance is high

due to constant voltage control. The oscillation causes charging operation to go ON/OFF repeatedly, and the

red LED blinks at BAT oscillation frequency. On this IC, it is assumed that battery connection check will be

done using the thermistor inside the battery pack. If a thermistor is not used, the IC RESET pin will go

ON/OFF according to whether a battery is present or not.

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