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RM-57/58
System Module
Nokia Customer Care
Figure 112 External earpiece circuitry (Pop-Port connected on the right)
Vibra circuitry
Vibra is used for vibra-alarm function.
The vibra motor is connected to the Retu ASIC VibraP and VibraN Pulse Width Modulated (PWM) outputs.
Figure 113 Vibra circuitry
TM
Pop-port
connector
TM
Pop-Port
connector provides a fully differential 4–wire stereo line-level output connection and fully
differential 2-wire mono line-level or microphone level input connection.
The handsfree driver in Retu is meant for the headset.
The output is driven in a fully differential mode. In the fully differential mode, the handsfree pin is the negative
output and the HFCM pin is the positive output. The gain of the handsfree driver in the differential mode is 6 dB.
The earpiece and headset signals are multiplexed so that the outputs cannot be used simultaneously.
Issue 1
Company Confidential
Page 9–27
Copyright ©2005 Nokia. All Rights Reserved.
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