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M62256FP

Single chip battery charger control IC

MITSUBISHI ELECTRIC  

Mitsubishi Integrated Circuit <Digital/Analog Interface>

M62256FP

Single chip battery charger control IC

FUNCTION DESCRIPTION

1. Charging Operation

(1) Detection of Battery

When the Batt SW terminal shows "L", it indicates that the battery is installed

(2) Conditions for Quick Charge

As soon as the battery is installed, its voltage and temperature are detected. If the battey

voltage is below 5V, the preliminary charging mode starts. When the battery voltage exceeds

5V, the quick charge commences.

On the other hand, if the battery voltage exceeds 5V, the following will take place. If the

battery temperature is less than 55˚C, the quick charge will take place. If it is higher than 55˚C,

the preliminary charge mode will continue until the temperture falls below 55˚C. The charge

current used for the quick charge is set by Iset1.

(3) Initialization timer

The initialization timer is set according to Table1. The -∆V is not detected fot 3 minutes.

Detection of -∆V within the initialization timer is set to 1V to prevent erroneous detection of

-∆V during the initial charging.

Table1 Setting up the initialization timer

The initial battery voltage

Time of initializaton timer

Less than 5V

More than 5V but less than 6.5V

6.5V or more

20min.

5min.

3min.

(4) Charge control

When the initialization timer completes its function, detection of -∆V is set to 100mV and

the peak voltage of the battery held inside is compared against the battery voltage detected.

After -∆V is detected, the trickle charge starts at the current set by Iset2.

(5) Safety Timer

The Safety Timer controls the charging time. The quick charging time stops 3 hours and the

trickle charging time ends after 24 hours.

(6) Protective functions

(a) Over-voltage detection ………… Charging stops when the battery voltage goes to 9.5V

or higher.

(b) Over-heat detection ………… Charging stops when the battery temperature becomes

63˚C or higher. When the temperature goes to 45˚C or

lower, It recharges once.

(c) Power supply voltage detection When the power supply voltage goes below 2.8V, the

initial eset takes place.

(d) Unplugged power supply cord … When the unplugged power supply cord is detected, the

output SW is turned off.

(7) Appliciable batteries

Ni-Cd battery, Ni-MH(nickel-metalhydrogen) battery (∆T/∆t, V taper can not be detected.)

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