User Guide

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Microphone

The microphone module for this device is used Pop-Port

microphone module. Its sensitivity is -42dB Nominal.

Contacts are done by springs.

Two inputs are used from UEMEK, one for the normal internal microphone and the other for the headset. The

third microphone input is used for FM. Microphone bias block in UEMEK generates bias voltages for handportable

and handsfree/headset microphones. For both microphone bias outputs (MICB1 & MICB2), the minimum output

voltage is 2.0 V and maximum output current is 600 mA. Microphone bias block also includes a low pass filter

for the reference voltage used as an input for the MICB1&2 amplifiers.

IHF amplifier and speaker

The speaker to be used in this mobile device is a 16-mm 8-Ω speaker. It can handle 0.3 W nominal power and

short trem peak power of 0.8 W. The component is housed in the antenna housing and connects to the UI board

via spring contacts.

PAOUTP and PAOUTN lines of UEMEK are use to drive Boomer amplifier for the speaker.

Power amplifier is a differential operational amplifier (opamp). The differential output drives the HandsFree

speaker. HandsFree amplifier load impedance is 8 Ω.

The outputs go into a high impedance state when powered down. The amplifier can be enabled and shut down

using a GENIO line from UPP_WD2.

Software controls IHF, headset and earpiece volume via UEMEK. Gain setting can be done in 2 dB steps, from –

40 to +6 dB. The output sound pressure level of the Internal HandsFree speaker is controlled by software(CBus

is used for controlling).

The supply voltage for the IHF amplifier is taken directly from the battery voltage.

External audio interface

This phone has a PopPort

connector with differential 4–wire audio connection.

The handsfree (HF) driver in UEMEK drives the headset in differential mode. 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 can not be used simultaneously. The HF and HFCM amplifiers include a transient suppression

circuitry, which prevents unwanted spikes in HF and HFCM outputs when switching on and off the amplifiers.

The HeadInt line will be pulled up to 2.7 V by the internal resistor when the accessory is not connected. When

having the accessory inserted the voltage in the HeadInt line will be <0.8 V caused by internal pull down resistor

in the HF line.

Camera interface

This mobile has a digital camera with viewfinder function. The resolution is 1.22 Mpixel. The camera module is

connected by means of a connector on the UI board.

The camera interface is a serial CCP (compact camera port), which is an unidirectional interface; the control

information to camera is transmitted through I2C bus. The I2C bus is implemented purely by the software using

general purpose I/Os.

The CCP interface consists of differential clock and data signals. The CCP enables the use of high data rates with

low EMI; maximum transfer capacity is 104Mbit/s.

The camera needs two power sources; 2.8V for analog circuit voltage VDD and 1.8V for digital circuit voltage

VDDI. VDD is provided from a discrete regulator asVCAM and VDDI is fed from UEMEK’s Vcore.

RM-51

Nokia Customer Care System module and user interface

Page 9–14 Company Confidential 9238460 (Issue 1)