User Guide

RH-26
2 - System Module CCS Technical Documentation
Page 24 ©Nokia Corporation Issue 1 02/04
•ACP-8
•ACP-12
•LCH-8
•LCH-12
The 3-wire chargers have a 3-wire interface to the phone, 2 power and 1 control. To con-
trol the charger output voltage, the wire carries a 32Hz digital pulse width modulated
signal generated by the phone. In RH-26, 32 Hz PWM for the charger is connected to
GND inside the bottom connector. This sets full charger output voltage and equals to 0%
PWM from the charger point of view.
The output capacity of a fast charger is typically 1000uF. The cable impedance (from out-
put capacitor to the phone) is typically 0.5 Ω.
Figure 8: U/I specification at control input 0% or without control