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– 5-15 –
Battery Pack
Li-lon
3 bar
3.65 V <
< 3.95 V
2 bar
3.54 V <
< 3.65 V
1 bar
3.3 V <
< 3.54 V
Low Voltage Alarm
< 3.3 V
After generating a low battery alarm the phone will power down two minutes.
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.
5.5.2.
Deeply Discharged Batteries
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.
5.5. Battery Charging and Monitoring
5.5.1.
Charging Current
The status of the LCD battery icon is determined by the value of ADC returned from U201, as indicated in the table: