V1.0 Page 25 of 38 ICM MP CC ST
A35-A36-A40 Company Confidential 09/01
Trickle Charging
If the phone has not been used for a longish time (longer than approx. 1 month), Notes
the battery could be totally self-discharged (battery voltage is below 3.2 V), so that
it is not possible to charge the battery via the normal charging circuit. In this case
only trickle charging is possible The charging current for trickle charging is <10mA.
After approx. 10 hours of trickle charging the mobile switches to “normal charging”
The trickle charging circuit consists of the resistor R200 and the 2 diodes V202
and V204.
Charging Circuit
Trickle charging by pass
Charging activation
Power supply recognition
!! Attention!!
⇒ a charger voltage >15V can destroy resistors or capacitors in the charging path
⇒ a charger voltage >20V can destroy the MOS-FET switch transistor in the
charging path.
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