Vibra; Introduction; Acoustic Design; Batteries - Nokia RH-53 Manual

RH-53/54
8-System Module
UEM
MICB1
2k2
MIC1P
2k2
MIC1N
MICBCAP
1u
■

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.
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.
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.
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Batteries

Type:BL-4C battery
Technology:Li-Ion. 4.2V charging. 3.1V cut-off
Capacity:760 mA/h
ISSUE 1 09/2004
Figure 6:Microphone interface
220 1k
4.7uF
2*33n
1n 1n
COMPANY CONFIDENTIAL
Copyright © 2004 Nokia. All Rights Reserved.
Nokia Customer Care
Placed near
Placed near
bottom
UEM
connector
10n
2k2
2k2
10n
MIC+
1n
MIC-
25