Battery Charging And Monitoring; Charging Current; Deeply Discharged Batteries - Panasonic EB-G50 Service Manual

Personal cellular telephone

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5.6. Battery Charging and Monitoring

5.6.1.

The status of the LCD battery icon is determined by the value of ADC0 returned from AD6521, as

indicated in the table:

3 bar

2 bar

1 bar

Low Voltage Alarm

The phone will power down two minutes after generating a Low battery Alarm.

Battery charging is controlled by the CPU within the phone. If external power is detected and the temperature is within

specified limits, the charger starts the rapid charge algorithm.

When the battery is fitted, the charging algorithm is determined by constant voltage and constant current control with time,

temperature and voltage safeguards. A current limit no greater than the maximum charge current for any battery option

must be provided by the external power source.

5.6.2.

In the case of deeply discharged batteries, there may not be enough power in the battery to initiate charging. In this case,

the charging circuit automatically starts to trickle charge the battery until there is enough power to switch on the phone.

Battery Pack

Li-lon

3.65 V <

< 3.95 V

3.54 V <

< 3.65 V

3.3 V <

< 3.54 V

< 3.3 V

– 5–16 –

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