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PAMS Technical Documentation
HFU–2 Handsfree Unit
Original 11/97
PAMS
HFU–2 Handsfree Unit
Technical Documentation
CONTENTS
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
List of Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supply Voltage and Power Consumption . . . . . . . . . . . . . . . .
Charging voltage limits within current specifications fulfilled
Audio Specifications, electrical . . . . . . . . . . . . . . . . . . . . . . . . .
HFS–12 Audio Specifications, acoustic . . . . . . . . . . . . . . . . . .
HFM–8 Audio Specifications, acoustic . . . . . . . . . . . . . . . . . . .
Audio signal levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Signals and Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exploded View of HFU–2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts list of ED2 (EDMS Issue )
Code: 0200948 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3
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Original 11/97
PAMS
Technical Documentation
HFU–2 Handsfree Unit
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 exter-
nal 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 pro-
vides an interface to the Mobile holder MCC–1 via the external cable.
The unit consists of a rapid charger, HF–microphone– and speaker ampli-
fiers, 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 bat-
tery, HFU–2 goes in to the sleep mode if the car is not running and/or the
phone is not connected.
Original 11/97
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PAMS
HFU–2 Handsfree Unit
Technical Documentation
List of Modules
Name of module
HF unit
HF module
Assembly parts
Type code
HFU–2
ED2
MHFU–2
Material
code
0694049
0200948
0261602
Notes
Advanced handsfree unit
ED2 Advanced hadsfree module
Mechanical Parts
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 ac-
tive 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 exter-
nal 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
X300 / 6
X300 / 1
X300 / 1
X300 / 1
X300 / 1
Line Symbol
GND
VB
VB
VB
VB
8.0
10.8
0.05
0.2
13.5
1
0.8
Minimum
Typical /
Nominal
0
16
16
2
1
Maximum
Unit / Notes
VDC
VDC (working)
VDC (spec. fulfill)
IDC/A (operating)
IDC/mA (sleep
mode)
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Original 11/97
PAMS
Technical Documentation
HFU–2 Handsfree Unit
Charging voltage limits within current specifications fulfilled
Conn. / pin
X200 / 7
X200 / 2
X200 / 2
Line Symbol
GND
+10VA
+10VA
Minimum
0
9.50
Typical /
Nominal
0
10.0
11
Maximum
0.1
10.55
200
Unit / Notes
VDC
VDC
IDC / mA
Conn. / pin
X100 /
5,6,11
X100 / 8,9
X100 / 12
X100 / 12
Line Symbol
GND
V_IN
VB
VB
Minimum
0
3
8
Typical /
Nominal
0
Maximum
0.1
8.5
16
500
Unit / Notes
VDC
VDC
VDC / car battery
IDC / mA
Audio Specifications, electrical
Minimum
Max speaker output power at
distortion=1%, 1 kHz sine
HF–speaker amplifier gain
PSRR, XEAR line
CMRR, XEAR–SGND to
speaker
HF–mic amplifier gain
Mic level at XMIC–SGND,
(clipping level)
Mic distortion at XMIC–
SGND, at Vo = 100 mVrms,
1 kHz
Noise voltage, HFMIC
PSRR, XMIC
Crosstalk XEAR–SGND to
XMIC
–60
–67
– 55
– 45
3.0
27
–60
–50
27
2000
0.15
Typical /
Nominal
3.1
29
–68
–55
30
33
2800
0.4
31
Maximum
Unit / Notes
W / Rload = 8 ohm
dB
dB
dB
dB
mVpp
%
5
uVrms psofometric
dB
dB / electrical, 1kHz
Original 11/97
Page 5

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