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RM-36
Nokia Customer Care
System Module
Figure 119 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 120 Vibra circuitry
TM
Pop-port
connector
TM
Pop-Port
connector provides a fully differential 4–wire connection.
The HandsFree (HF) driver in Retu is meant for the headset.
The output is driven in a fully differential mode. In the fully differential mode, the HF 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 (EARP, EARN) and headset (HF, HFCM) signals are multiplexed so that the outputs cannot be used
simultaneously.
Page 9–30
Company Confidential
Issue 1
Copyright ©2005 Nokia. All Rights Reserved.
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