Nokia 2650 서비스 매뉴얼
ISSUE 1 09/2004
COMPANY CONFIDENTIAL
25
Copyright © 2004 Nokia. All Rights Reserved.
RH-53/54
8-System Module
Nokia Customer Care
Figure 6:Microphone interface
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Vibra
Introduction
Vibra is a small cylindrical DC motor with a
∅4.0-mm in diameter that generating vibration by
rotating an un-balanced mass (counter weight) with radius of R=2.5-mm when the applied volt-
age is on.
age is on.
The vibration signal will be used as a silent alert call and also as a noticeable shock in gaming.
Acoustic design
The vibra is placed in the top of the phone when it is fold/closed but it placed under the display
when it is unfold. The counter weight is placed in the top middle (unfold) that may results to
shorter distance to the mass center of the phone. This mechanical solution will result to lower
vibration/velocity amplitude, as the axel of torque is shorter.
when it is unfold. The counter weight is placed in the top middle (unfold) that may results to
shorter distance to the mass center of the phone. This mechanical solution will result to lower
vibration/velocity amplitude, as the axel of torque is shorter.
The vibra is electrically connected to the flexfilm by spring contacts.
The vibra is controlled from the UEMK by a PWM (Pulse Wide Modulated) square wave signal.
The nominal rated voltage for the vibra is approximately about 1.3 volts and the nominal battery
voltage is about 3.6 volts. To achieve an optimal voltage over the vibra, the following table
should be used.
voltage is about 3.6 volts. To achieve an optimal voltage over the vibra, the following table
should be used.
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Batteries
Type:BL-4C battery
Technology:Li-Ion. 4.2V charging. 3.1V cut-off
Capacity:760 mA/h
UEM
1k
1k
MIC+
MIC-
4.7uF
MIC1N
MIC1P
MICB1
220
2k2
2k2
1n
1n
MICBCAP
1u
1n
22
k
2*33n
Placed near
UEM
Placed near
bottom
connector
2k2
2k2
10n
10n