PAMS Technical Documentation
NSD±3 Series Transceivers
HFU±2
Issue 1 06/1999 |
Nokia Mobile Phones Ltd. |
NSD±3 |
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HFU±2 |
PAMS Technical Documentation |
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CONTENTS |
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Introduction . . . . . . . . . . . . . . . |
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3 |
Technical Summary . . . . . . |
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3 |
List of Modules . . . . . . . . . . |
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4 |
Operation . . . . . . . . . . . . . . |
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4 |
Supply Voltage and Power Consumption . . . . . . . . . . . . . . . . |
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Charging voltage limits within current specifications fulfilled |
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Audio Specifications, electrical . . . . . . . . . . . . . . . . . . . . . . . . . |
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HFS±12 Audio Specifications, acoustic . . . . . . . . . . . . . . . . . . |
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HFM±8 Audio Specifications, acoustic . . . . . . . . . . . . . . . . . . . |
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Audio signal levels . . . . . . . |
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Signals and Connections . |
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Block Diagram . . . . . . . . . . |
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7 |
Exploded View of HFU±2 . |
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8 |
Parts list of ED2 (EDMS Issue 9.0) Code: 0200948 . . . . . . . . . . |
9 |
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Schematic Diagrams of ED2 |
(at the back of the binder, A3 size) |
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Circuit Diagram of Power and Charging (Version 7.0 Edition 104) layout 07 C±1
Circuit Diagram of Audio (Version 7.0 Edit 96) for layout version 07 . . . . . . . C±2
Layout Diagram of UD2 (Version 07) . . . . . . . . . . . . . . . . . . . . . . |
C±3 |
Page 2 |
Nokia Mobile Phones Ltd. |
Issue 1 06/1999 |
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NSD±3 |
PAMS Technical Documentation |
HFU±2 |
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Introduction
The HFU±2 is a handsfree unit for DCT3 compatible handportable phones. It provides rapid charging for the phone, a possibility to use HF± operation and connections to the data±card and handset unit. The HF box can be connected directly to the Mobile holder MCC±1 via the external cable.
Technical Summary
The HFU±2 has connections to car battery, car ignition sense, car radio muting, antenna motor control, data±card, handset HSU±1, external speaker and microphone. The unit has a System±connector that provides an interface to the Mobile holder MCC±1 via the external cable.
The unit consists of a rapid charger, HF±microphone± and speaker amplifiers, interface to handset, ± datacard and ±phone, voltage regulators and control circuit (microprocessor).
The HFU±2 is always connected to the car battery. To save the car battery, HFU±2 goes in to the sleep mode if the car is not running and/or the phone is not connected.
Issue 1 06/1999 |
Nokia Mobile Phones Ltd. |
Page 3 |
NSD±3 |
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HFU±2 |
PAMS Technical Documentation |
List of Modules
Name of module |
Type code |
Material |
Notes |
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code |
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HF unit |
HFU±2 |
0694049 |
Advanced handsfree unit |
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HF module |
ED2 |
0200948 |
ED2 Advanced hadsfree module |
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Assembly parts |
MHFU±2 |
0261602 |
Mechanical Parts |
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Operation
Phone not connected (sleep mode):
When the phone is not connected the current consumption of the device has been minimized. The switching mode power supply (SMPS) and audio circuits has been turned off. HFU±2 is only waiting a phone to be connected.
Phone connected (active mode):
When the phone is connected to the HFU±2 it goes into the active mode. In the active mode the device provides charging current to the phone. It also can provide hands free call option using the external speaker and the external microphone or micspeaker unit. If more private call wants to be made, the phone itself can be used as a handset without losing the external antenna connection or with handset (option).
The phone controls all functions of HFU±2. In the active mode the HFU±2 sends all state transitions to phone via mbus.
HFU±2 also provides car radio mute function during call.
HFU±2 can control the mobile antenna motor if it is installed to the car.
Supply Voltage and Power Consumption
Conn. / pin |
Line Symbol |
Minimum |
Typical / |
Maximum |
Unit / Notes |
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Nominal |
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X300 / 6 |
GND |
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0 |
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VDC |
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X300 / 1 |
VB |
8.0 |
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16 |
VDC (working) |
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X300 / 1 |
VB |
10.8 |
13.5 |
16 |
VDC (spec. fulfill) |
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X300 / 1 |
VB |
0.05 |
1 |
2 |
IDC/A (operating) |
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X300 / 1 |
VB |
0.2 |
0.8 |
1 |
IDC/mA (sleep |
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mode) |
Page 4 Nokia Mobile Phones Ltd. Issue 1 06/1999
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NSD±3 |
PAMS Technical Documentation |
HFU±2 |
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Charging voltage limits within current specifications fulfilled
Conn. / pin |
Line Symbol |
Minimum |
Typical / |
Maximum |
Unit / Notes |
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Nominal |
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X200 / 7 |
GND |
0 |
0 |
0.1 |
VDC |
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X200 / 2 |
+10VA |
9.50 |
10.0 |
10.55 |
VDC |
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X200 / 2 |
+10VA |
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11 |
200 |
IDC / mA |
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Conn. / pin |
Line Symbol |
Minimum |
Typical / |
Maximum |
Unit / Notes |
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Nominal |
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X100 |
/ |
GND |
0 |
0 |
0.1 |
VDC |
5,6,11 |
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X100 |
/ 8,9 |
V_IN |
3 |
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8.5 |
VDC |
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X100 |
/ 12 |
VB |
8 |
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16 |
VDC / car battery |
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X100 |
/ 12 |
VB |
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500 |
IDC / mA |
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Audio Specifications, electrical
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Minimum |
Typical / |
Maximum |
Unit / Notes |
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Nominal |
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Max speaker output power at |
3.0 |
3.1 |
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W / Rload = 8 ohm |
distortion=1%, 1 kHz sine |
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HF±speaker amplifier gain |
27 |
29 |
31 |
dB |
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PSRR, XEAR line |
±60 |
±68 |
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dB |
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CMRR, XEAR±SGND to |
±50 |
±55 |
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dB |
speaker |
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HF±mic amplifier gain |
27 |
30 |
33 |
dB |
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Mic level at XMIC±SGND, |
2000 |
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2800 |
mVpp |
(clipping level) |
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Mic distortion at XMIC± |
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0.15 |
0.4 |
% |
SGND, at Vo = 100 mVrms, |
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1 kHz |
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Noise voltage, HFMIC |
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5 |
uVrms psofometric |
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PSRR, XMIC |
±60 |
±67 |
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dB |
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Crosstalk XEAR±SGND to |
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± 55 |
± 45 |
dB / electrical, 1kHz |
XMIC |
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Issue 1 06/1999 |
Nokia Mobile Phones Ltd. |
Page 5 |
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