Nokia NSD–3 HFU–2 Technical
PAMS Technical Documentation
NSD–3 Series Transceivers
HFU–2
Issue 1 06/1999 Nokia Mobile Phones Ltd.
NSD–3
HFU–2
PAMS Technical Documentation
CONTENTS
Introduction 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical Summary 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
List of Modules 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operation 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supply Voltage and Power Consumption 4. . . . . . . . . . . . . . . .
Charging voltage limits within current specifications fulfilled 5
Audio Specifications, electrical 5. . . . . . . . . . . . . . . . . . . . . . . . .
HFS–12 Audio Specifications, acoustic 6. . . . . . . . . . . . . . . . . .
HFM–8 Audio Specifications, acoustic 6. . . . . . . . . . . . . . . . . . .
Audio signal levels 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Signals and Connections 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Block Diagram 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exploded View of HFU–2 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts list of ED2 (EDMS Issue 9.0) Code: 0200948 9. . . . . . . . . .
Schematic Diagrams of ED2 (at the back of the binder, A3 size)
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
PAMS Technical Documentation
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.
NSD–3
HFU–2
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
HFU–2
List of Modules
PAMS Technical Documentation
Name of module Type code Material
code
HF unit HFU–2 0694049 Advanced handsfree unit
HF module ED2 0200948 ED2 Advanced hadsfree module
Assembly parts MHFU–2 0261602 Mechanical Parts
Notes
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 /
Nominal
X300 / 6 GND 0 VDC
X300 / 1 VB 8.0 16 VDC (working)
X300 / 1 VB 10.8 13.5 16 VDC (spec. fulfill)
X300 / 1 VB 0.05 1 2 IDC/A (operating)
X300 / 1 VB 0.2 0.8 1 IDC/mA (sleep
Maximum Unit / Notes
mode)
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Nokia Mobile Phones Ltd.
Issue 1 06/1999
PAMS Technical Documentation
Charging voltage limits within current specifications fulfilled
NSD–3
HFU–2
Conn. / pin Line Symbol Minimum Typical /
Nominal
X200 / 7 GND 0 0 0.1 VDC
X200 / 2 +10VA 9.50 10.0 10.55 VDC
X200 / 2 +10VA 11 200 IDC / mA
Conn. / pin Line Symbol Minimum Typical /
Nominal
X100 /
5,6,11
X100 / 8,9 V_IN 3 8.5 VDC
X100 / 12 VB 8 16 VDC / car battery
X100 / 12 VB 500 IDC / mA
GND 0 0 0.1 VDC
Maximum Unit / Notes
Maximum Unit / Notes
Audio Specifications, electrical
Minimum Typical /
Nominal
Max speaker output power at
distortion=1%, 1 kHz sine
HF–speaker amplifier gain 27 29 31 dB
3.0 3.1 W / Rload = 8 ohm
Maximum Unit / Notes
PSRR, XEAR line –60 –68 dB
CMRR, XEAR–SGND to
speaker
HF–mic amplifier gain 27 30 33 dB
Mic level at XMIC–SGND,
(clipping level)
Mic distortion at XMIC–
SGND, at Vo = 100 mVrms,
1 kHz
Noise voltage, HFMIC 5 uVrms psofometric
PSRR, XMIC –60 –67 dB
Crosstalk XEAR–SGND to
XMIC
–50 –55 dB
2000 2800 mVpp
0.15 0.4 %
– 55 – 45 dB / electrical, 1kHz
Issue 1 06/1999
Nokia Mobile Phones Ltd.
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