ERICSSON EF738 Accessories

Accessories

Ericsson Mobile Phone EF738

Accessories

2

Accessories

Contents

Rapid Charger _____________________________________ 7

Introduction ______________________________________________ 7
Main Features ____________________________________________ 7

Versions ____________________________________________________ 8

Connectors _______________________________________________ 8

Secondary DC-cord ___________________________________________ 8

Specifications _____________________________________________ 8

Travel Charger ___________________________________ 9

Introduction ______________________________________________ 9
Main Features ____________________________________________ 9

Indicators __________________________________________________ 10

Output Characteristics ____________________________________ 10
Connector_______________________________________________ 11

Secondary DC-cord __________________________________________ 11

Specifications ____________________________________________ 11

Vehicle Power/Charger _____________________________ 13

Introduction _____________________________________________ 13
Main Features ___________________________________________ 13

Indicators __________________________________________________ 14

Output Characteristics ____________________________________ 14
Connectors ______________________________________________ 15

Cigarette Lighter Adaptor______________________________________ 15
Power Plug _________________________________________________ 15

Specifications ____________________________________________ 15

Continued on next page

3

Accessories

DeskTop Charger MC7000 __________________________ 17

Introduction______________________________________________17
Electronics _______________________________________________18

Central Processing Unit _______________________________________ 18
Supply Current Monitor _______________________________________ 19
Charge Switches ______________________________________ ____ ___ 19

Front Slot Switch__________________________________________ 19
Rear Slot Switch __________________________________________ 19

Voltage Monitors ____________________________________________ 19

Front Slot Monitor_________________________________________ 19

Rear Slot Monitor _________________________________________ 19
Phone On/Off Status__________________________________________ 20
Discharger__________________________________________________ 20
LED Indicators ______________________________________________ 20

Front LEDs ______________________________________________ 20

Rear LEDs _______________________________________________ 20
Temperature Guard___________________________________________ 20

Power Distribution for Phone Operation ______________________20
Battery Charging _________________________________________20

Front Slot Charger____________________________________________ 21

Main Charging____________________________________________ 21

Trickle Charging __________________________________________ 21
Rear Slot Charger ____________________________________________ 21

Main Charging____________________________________________ 21

Trickle Charging __________________________________________ 21

Discharging ______________________________________________ 21
Error Detection ______________________________________________ 22
LED Indicators ______________________________________________ 22

Front Indicator - Phone Slot__________________________________ 22

Rear Indicator - Spare Battery Slot ____________________________ 22

Specifications_____________________________________________22
Connectors and Signals ____________________________________23

System Bus Connector ________________________________________ 23
Front Slot ___________________________________________ ____ ___ 23
Rear Slot ___________________________________________________ 24

Portable HandsFree ____ ____ ___ ___ ____ ___ ___ ____ ___ _ 25

Introduction______________________________________________25
Portable HandsFree Features _______________________________25
Specifications_____________________________________________26

Microphone_________________________________________________ 26
Earphone___________________________________________________ 26

Connector and Signals _____________________________________26

Continued on next page

4

Accessories

Vehicle HandsFree Solution HF7300 __________________ 27

Introduction _____________________________________________ 27

HandsFree Features ______________________________________ 27

HandsFree Components ___________________________________ 28

Cradle _____________________________________________________ 28
Stick-On Microphone_________________________________________ 28
External Speaker_____________________________________ _____ ___ 28
HandsFree Unit______________________________________________ 28

Microphone Amplifier______________________________________ 29
Speaker Amplifier _________________________________________ 29
Modem/Handset Option ____________________________________ 29
Audio Switch Control ______________________________________ 29
External Audio Control_____________________________________ 29
Music Mute Control _______________________________________ 29
Power Supply_____________________________________________ 30

Optional Accessories ______________________________________ 30

Music Mute_________________________________________________ 30
Goose-Neck Microphone ______________________________________ 30
Data Extension ______________________________________________ 30
External Handset_______________ ____ __________________________ 30

Specifications ____________________________________________ 31

HandsFree Unit______________________________________________ 31
Cradle _____________________________________________________ 31

Connectors and Signals____________________________________ 32

Holder_____________________________________________________ 32

System Connector _________________________________________ 32

HandsFree Unit______________________________________________ 32

System Connector J1_______________________________________ 33
Power Connector J2________________________________________ 33
Microphone Connector J4___________________________________ 34
Music Mute Connector J5___________________________________ 34
Data Communication Connector J6____________________________ 34
Speaker Connector J7 ______________________________________ 34

Continued on next page

5

Accessories

Vehicle HandsFree Solution HF7600 __________________ 35

Introduction______________________________________________35
HandsFree Features _______________________________________35

Echo Cancellation____________________________________________ 36
Noise Reduction _____________________________________________ 36

HandsFree Components____________________________________36

Cradle _____________________________________________________ 36
Stick-On Microphone _________________________________________ 36
External Speaker_____________________________________________ 37
Handsfree Unit ______________________________________________ 37

Digital Signal Processor (DSP) _______________________________ 37

Audio-To-Mobile-Station ___________________________________ 37

Audio-From-Mobile-Station _________________________________ 37

Microphone Amplifier______________________________________ 37

Speaker Amplifier _________________________________________ 37

Music Mute Control________________________________________ 38

Power Supply_____________________________________________ 38

Optional Accessories_______________________________________38

Music Mute_________________________________________________ 38
Goose-Neck Microphone ______________________________________ 38
Data Extension ______________________________________________ 38
External Handset _____________________________________________ 39

Specification______________________________________________39

Handsfree Unit ______________________________________________ 39
Cradle _____________________________________________________ 39

Connectors and Signals ____________________________________40

Holder _____________________________________________________ 40

System Connector _________________________________________ 40
HandsFree Unit______________________________________________ 40

System Connector J1_______________________________________ 41

Power Connector J2________________________________________ 41

Microphone Connector J4 ___________________________________ 42

Music Mute Connector J5 ___________________________________ 42

Data Communication Connector J6____________________________ 42

Speaker Connector J7 ______________________________________ 42

6

Rapid Charger

Introduction

Rapid Charger

The
tional transformer followed by a rectifying circuitry. This charger can consequently
not be used worldwide, as opposed to a primary switched charger, and will therefor
be available in several different versions as listed on next page.

Rapid Charger

The

•

AC/DC converter incl. wall plug

•

secondary cord with power connector

Accessories

is a basic charger which converts AC to DC by using a conven-

consists of:

The AC/DC converter is plugged directly into the mains power outlet and the recti­fied DC voltage/current is distributed via the secondary cord to the power connec­tor, which is plugged into the system connector of the phone.

Main Features

Rapid Charger

The

•

•

7X8

the

the DeskTop Charger MC7000

-family phones

can be used as power source in two different ways, for:

7

Accessories

Versions

Rapid Charger

The
quencies, and power outlets as specified below:

Mains voltage Frequency Mains plug

115V ±10% 60Hz ±5% US standard
230V -10% to +6% 50Hz ±5% EU standard

240V -10% to +6% 50Hz ±5% UK standard
240V ±10% 50Hz ±5% AUS standard

is designed in several vers ions for different mains voltages, fre-

US (Thailand)
UK (Hong Kong)

Connectors

Secondary DC-cord

GND

V

DC

Specifications

Type No: 402 0034-UK
Dimensions:

- AC/DC-Converter 78 x 42 x 45 mm; 3.1 x 1.7 x 1.8 in (excl. wall plug)

- Power Plug 24 x 11 x 11 mm; 0.9 x 0.4 x 0.4 in

/700mA

DC

Versions
Versions

above
above

Input Voltage Refer to
Input Frequency: Refer to
Output Voltage/Current: 6V

8

Travel Charger

Introduction

Travel Charger

The
and power supply world wide without the need of an AC/AC-converter.

Travel Charger

The

•

mains primary AC-cord

•

AC/DC-converter

•

secondary DC-cord

Accessories

is a primary switched AC/DC-converter to be used as charger

consists of three parts:

Main Features

Travel Charger

The

•

•

7X8

the

the DeskTop Charger MC7000

-family phones

can be used as power source in two different ways, for:

9

Accessories

Indicators

A green LED located next to the secondary DC output is turned on whenever the
mains voltage is available on the primary side

LED

V

DC

output

connector

Output Characteristics

The output voltage and current of the
within the values indicated as “white” area in the picture below.

U (V)

8.4

7.6

2.0

Output power characteristics within range

Travel Charger

600 900

should after 5 minutes stay

1000

I (mA)

10

Output power characteristics within range first 5 minutes
Output power characteristics out of range after 5 minutes

Output power characteristics out of range

Connector

Secondary DC-cord

GND

n.c.

V

DC

n.c.

GND

V

DC

Accessories

Specifications

Type No: 402 0036-BV
Dimensions:

- AC/DC-Converter 95 x 38 x 27 mm; 3.7 x 1.5 x 1.1 in

- Power Plug 24 x 11 x 11 mm; 0.9 x 0.4 x 0.4 in
Input Voltage 100 - 240 V

Input Current: 150mA (typical)
Input Frequency: 50 - 60 Hz (±5%)
Output Voltage/Current: 7.6 V

/600mA

DC

AC

(±10%)

11

Accessories

12

Vehicle Power/Charger

Introduction

Vehicle Power/Charger

The
and power supply for the phone when plugged into the +12V or + 24V (negative
ground) cigarette lighter outlet.

Vehicle Power/Charger

The

•

cigarette lighter adaptor

•

coiled cord

•

power plug

is an integrated unit consisting of three parts:

Accessories

is a step-down DC/DC-converter to be used as charger

Main Features

Vehicle Power/Charger

The

•

•

7X8

the

the DeskTop Charger MC7000

-family phones

can be used as power source in two different ways, for:

13

Accessories

Indicators

A green LED located next to the coi led cord out let of th e cigare tt e light er adapt or is
turned on whenever the appropriate vehicle voltage is available.

LED

Output Characteristics

The output voltage and curr ent of the

Vehicle Power and Charger

the values indicated as “white” area in the picture below.

U (V)

8.4

7.6

600 900

Output power characteristics within range

should stay wit hin

I (mA)

14

Output power characteristics out of range

Connectors

Cigarette Lighter Adaptor

Ground Spring+V

Power Plug

Accessories

GND

V

DC

Specifications

Type No: 402 0035
Dimensions:

- Cigarette Lighter Adaptor 96 x 28 x 25 mm; 3.8 x 1.1 x 1.0 in

- Power Plug 24 x 11 x 11 mm; 0.9 x 0.4 x 0.4 in
Input Voltage 10.8 - 31.2 V
Output Voltage/Current: 7.6VDC/600mA

DC

15

Accessories

16

DeskTop Charger MC7000

Introduction

DeskTop Charger MC7000

The

7X8

-family telephones. The phone is placed in the front slot for simultaneous pow­ering and battery ch argi ng, whil e the spar e battery to be char ged is p laced i n the rear
slot, which also features a manual discharge/reconditioning facility.

is a dual desk charger specially designed for the

Accessories

As the
has to be connected to the system bus connector at the rear of the unit.

The external power source should be one of the following Ericsson product:

•

•

•

Furthermore, the Portable HandsFree as well as Mobile Office equipment can be
connected to the

MC7000

Rapid Charger
Travel Charger
Vehicle Power/Charger

does not

DeskTop Charger MC7000

include an intern al power s upply, an external power source

.

17

Accessories

Electronics

The electronics of the

MC7000

is designed around the Central Processing Unit.

Central Processing Unit

The Central Processing Unit (CPU) is equipped with 4kbyte ROM, thus making it
possible to control the entire

The supply voltage to the CPU is +3.8V which is being derived from a linear volt­age regulator and a cryst al gene ra tes a 5MHz clock fre quency to the oscil lato r in put
of the CPU.

The Central Processing Unit interacts with the following major peripheral blocks:

•

Supply Current Monitor

•

Charge Switches; front & rear

•

Voltage Monitors; front & rear

•

Phone On/Off Status

•

Discharger

•

LED Indicators; front & rear

•

Temperature Guard

System

Bus

Connector

ACCDCIO

Supply
Current
Monitor

MC7000

charger.

Front

Charge

Switch

Rear

Charge

Switch

Front
Voltage
Monitor

Front

Slot

DCIO

VDD

Rear

Slot

+V

18

Temp

Guard

Front
LEDs

Rear

LEDs

Rear
Voltage
Monitor

CPU

Phone
On/Off
Status

Dis-

charger

Accessories

Supply Current Monitor

The current distributed from the external power source to the front or rear slot
passes through the Supply Current Monitor. The CPU reads the output from the
Supply Current Monitor is order to establish whether

pleted

is in effect as follows:

>200mA: Charging
<200mA: Charging completed

charging

charging com-

or

Charge Switches

The current from the external power source to the two slots can independently be
switched On/Off by two separate CPU outputs.

Front Slot Switch

This CPU controlled switch is normally On except when the spare battery is being
charged.

Rear Slot Switch

The rear slot charging switch is controlled by the second CPU output, which will
allow charging of t he spar e batt ery onl y if the phon e batte ry is f ully c har ge d or if no
phone is inserted in th e fr ont slot. This switch goes Off for a short while once every
other second for voltage reading purposes.

Voltage Monitors

The CPU controls the Voltage Monitors to enable reading of the battery voltages.

Front Slot Monitor

If the CPU input of the Front Slot Voltage Monitor suddenly detects a voltage at
DCIO when the corresponding charge switch is Off, this means that the voltage is
coming from the battery, i.e. a phone has been inserted into the slot. This will be
detected regardless of whether the phone is turned On or Off. If Off when inserted,
the auto-turn-on mode will turn it On.
However, if th e phone is removed during charging, e.g. when a call is rec ei ved, this
will not be detected as this input still will read a voltage, now coming from the
external power source. (See Phone On/Off Status on next page)

Rear Slot Monitor

The Rear Slot Voltage Monitor detects whether the spare battery requires charging.
During the charging the current is switched off for a short while every other second
in order to read the battery voltage and in this way establish whether the battery is
fully charge d or not. The CPU is i n t his way also informe d i f t he battery is rem oved
during the charging process.

19

Accessories

Phone On/Off Status

The VDD input indicates wheth er the phone is Off or On and will inf orm the CPU if
the phone has been removed during charging.

Discharger

To prolong the battery life the rear slot is equipped with a reconditioning feature.
By pressing the discharge switch (same as the rear LED indicator), the CPU
becomes notified th at it will have to car ry out a dischar ge oper ation on th e batte ry in
the rear slot.
The CPU then activates the dis cha rge operation by draini ng t he bat t ery at a suitable
resistive load.

LED Indicators

The LEDs are used for indication of the various charging phases.

Front LEDs

The two front LEDs (green and red) can be On and Off in any combination except
both On.

Rear LEDs

The two rear LEDs (green and red) can be On and Off in any combination.

Temperature Guard

A temperature related voltage is generated due to an onboard NTC resistor and fed
to an input of the CPU for detection and measures to prevent overheating. The
threshold is set to +55°C onboard corresponding to an ambient temperature of
+35°C.

Power Distribution for Phone Operation

The power to the front slot for phone operation is entirely controlled by the phone.
The various current values needed in different situations, like stand-by or transmis­sion, are programmed and stored in the telephone.

MC7000

The
source is being connected.

is able to deliver 500 - 700 mA to the phone depending on the power

20

Battery Charging

The charging of both batteries is turned on and off by a switch circuitry which is
controlled by the Centra l Processi ng Unit. Char ging is onl y possible f or one slot at a
time where the front slot has got highest priority, i.e. charging of the spare battery
will not begin until the phone battery is fully charged or removed.

The batteries being used are four 1.2V cell NiMH (Nickel-Metal-Hydride) or NiCd
(Nickel-Cadmium) chargeable batteries, without internal thermistor.

Accessories

Front Slot Charger

Main Charging

The charging is entirely controlled by the phone, which after being inserted into the
charger slot starts being charged by the
battery in the rear slot is interrupted, and 500 - 700 mA is delivered to the phone
battery.

Note!

The phone does not have to be turned On when inserted into the charger slot

due to its auto-turn-on feature.

MC7000

. Any possible charging of a spare

Trickle Charging

After the main charging the phone automatically returns to normal power distribu­tion and trickle charging unless a spare battery then is going to be charged. The
power distributi on and tr ickle cha rgi ng to the phone i s in tha t case i nhibite d until t he
spare battery charging is terminated.

Rear Slot Charger

Main Charging

The 500 - 700 mA charging current to the spar e bat ter y is ent ir el y cont ro lled by the
Central Processin g Unit. Sev eral algorit hms are use d to e stablis h when the battery is
fully charged:

•

-dv/dt
The battery voltage is sampled once a second for approximately one minute and

the mean value is calculated. The max. mean value is stored and compared with
consecutive values. When a specific divergence is obtained, the charging is ter­minated.

•

peak detect
The charging is t erminated when the above mentio ned values a re less or iden tical

to the max. mean value for a specific time.

•

safety time elapsed (4 hours)
The safety timer is used as a last resort wh en the above methods fail.

Trickle Charging

When the main charging is completed an 8mA trickle charging generated by short
pulses is automatically initiated, but only in case the front slot is empty.

Discharging

After pressing the discharge button the spare battery is discharged by a 200mA cur­rent. Charging will commence when the battery voltage has dropped to 4.0V.

21

Accessories

Error Detection

An error is indicated and charging is halted for 20 minutes when the ambient tem­perature is higher than +35°C.

LED Indicators

Front Indicator - Phone Slot

Status Significance Detection

Off No phone Front Voltage Monitor or Phone On/Off Status
Red Charging Supply Current Monitor >200mA
Green Charging complete Supply Current Monitor <200mA

Rear Indicator - Spar e Battery Slot

Status Significanse Detection

Off No battery Rear Voltage Monitor
Red Charging Rear Voltage Monitor
Green Charging complete Rear Voltage Monitor
Yellow Discharging Discharge Switch
Red flash Temperature error Temperature Guard

Specifications

Battery type Charging time - Front Charging time - Rear

NiMH 650mAh:≈1h50min

Type No.: 402 0040-BV

402 0040-UK

Dimensions: 73 x 90 x 47 mm

2.9 x 3.5 x 1.9 in

Input voltage: 7 - 10 V
Ambient temp: +5°C to +35°C

+41°F to +95°F

DC

≈

1h25min

22

Connectors and Signals

System Bus Connector

Accessories

1

23

11

12

Pin Signal Specification

1 AFMS Audio-from-mobile -station
2 ATMS Audio-to-mobile-station
3 EXTAUD External analog audio accessory sense
4 AGND Audio signal ground, 0V refernce
5 PORTHF Portable handsfree
6 MUTE Music mute
7 VPPFLASH Flash memory voltage and service voltage
8 VDD Logic reference, status On
9 DFMS Data from mobile station
10 DGND Digital ground and DC return
11 DTMS Data to mobile station

12

ACCDCIO
DCIO

1)

DC positive pole for phone battery charging and exter-

2)

nal accessory powering

1) System Bus Connector

2) Front Slot Connector

Front Slot

112

Note: For pin assignments, refer to

System Bus Connector

above

23

Accessories

Rear Slot

- Negative pole
+ Positive po le

24

Portable HandsFree

Introduction

Portable HandsFr ee

The
mobility of a handhe ld pho ne with t he ad vantag es of being handsf ree.Th e fol lowing
three main components are included:

•

microphone

•

earphone

•

connector

The connector is plugged into the system connector of the phone. After fitting the
earphone and attaching the microphone clip to a suitable part of the clothing, the
portable handsfree facility is ready to be used.

Accessories

is a light-weight un it which al lows the user to combi ne the

Portable HandsFree Features

Portable HandsFr e e

The
family.

The portable handsfree communi cation is full duplex, i.e. both par ties will be able to
talk simultaneously.

is designed to be used wit h all phon es i n the Eri csson

7X8

25

-

Accessories

Specifications

Type No.: 502 0013-BV

Microphone

Characteristics: Omnidirectional
Sensitivity: -43.5dB ±3dB rel. 1V/Pa at 1kHz

≤

Impedance:
S/N ratio:

Earphone

Sensitivity: 106dB/250mV at 1kHz
Impedance: 16

2k

≥

35dB

Ω

Ω

Connector and Signals

PORTHF
GND
MIC
EAR

Portable HF connector Signal direction System connector

MIC ATMS
EAR AFMS
GND GND

26

PORTHF (actice LO) PORTHF (detect)

Vehicle HandsFree Solution HF7300

Introduction

Accessories

Vehicle Handsfree Solution HF7300

The
family telephones and includes apart from the handsfree facilities also a power sup­ply for battery charging and phone operation.

The four main components are:

•

Cradle

•

Stick-On Microphone

•

External Speaker

•

Handsfree Unit

is specially designed for the Ericsson

7X8

-

HandsFree Features

The HandsFree Unit does not include a DSP (digital signal processor) as the CPU
(Central Processing Unit) of the telephone handles the handsfree switching.

The handsfree function is semi-duplex, which only permits one party to talk at a
time while the other party is switched off to avoid feedback. When the land side
party is talking, a "comfort noise" is added to simulate the background noise heard
from the mobile .

27

Accessories

HandsFree Components

Cradle

The cradle consists of tw o sub-units, the

Cradle Attachment

The Cradle is equipped with a slide joint which is adjusted during the installation to
a suitable vertical and horizontal angle for easy reach of the phone. The snap/click­in Holder connects the phone to the HandsFree Unit.

Cradle Attachment

and the

Holder.

Holder

Stick-On Microphone

The Stick-On Microphone included in the kit is a unidirectional microphone to be
mounted in a fixed position in the vehicle and connected to the HandsFree Unit.

External Speaker

Unless an optional Music Mute unit is utilised, the 4Ω External Speaker has to be
connected to the speaker amplifier output of the HandsFree Unit.

HandsFree Unit

The HandsFree Unit includes the following electronic blocks:

•

Microphone Amplifier

•

Speaker Amplifier

•

Modem/Handset Option

•

Audio Switch Control

•

External Audio Control

•

Music Mute Control

•

Power Supply

28

Accessories

Microphone Amplifier

The Microphone Amplifier has got two in dividu al input s for the two types of mic ro­phones being available:

•

Stick-On microphone (standard)

•

Goose-Neck microphone (optional)

The microphone signal passes through two amplifier stages which results in a total
gain of 31dB and 21dB for the Stick-On and Goose-Neck microphone resp.

Speaker Amplifier

The AFMS (audio-from-mobile-st ation) signa l received from the phone is amplifi ed
by a programmable gain amplifier and fed to a differential amplifier consisting of
four power transi st ors resulting in a total gain of 21 dB. To protect the power tra nsi s­tors and the speaker against high current, a feed back signal from the power transis­tors to the programmable amp will allow only short peaks of high current to get
through but reduce continuous high current to approximately 1.2 A correspo nding to
just about 5W output power.

Modem/Handset Option

The Data Communication connector can be utilised for connection of two different
options:

•

analog PCMCIA modem

•

external handset

When any of these devices is connected the audio signal ATMS (Audio-To-Mobile­Station) is switched to this connector, while AFMS (audio-from-mobile-station)
always is available.

Note

: A Data Extension Unit is required for the connection between the optional

unit and the Data Communication connector.

Audio Switch Control

The Audio Multiplexer Control is used to switch the audio paths between the exter­nal microphone and the modem/handset connector.

Control signals such as EXTAUD (external audio control) and MUTEINV (in verted
mute) are derived from logical gates controlled by the signals PORTHF (portable
handsfree), DV (data/voice), and HOOKSNS (hook sense).

External Audio Control

The EXTAUD (external audio control) signal informs the phone when an accessory
which is using the two ext ernal a udio si gnals AFMS and ATMS has been connecte d
to the HandsFree Unit

Music Mute Control

An optional Music Mute unit can be supplied with +12V from the vehicle battery.
The Music Mute function is contr olled from the pho ne by the MUTE signal which i s

29

Accessories

inverted by an open col lect or tra nsist or bef ore becoming a vai lable at two of the con ­nectors.

Power Supply

The Handsfree Unit is able to deliver power to the phone for operation and battery
charging by regulating the +12V of the vehicle battery to a constant current supply
of max. 850mA and less than 1mA during stand-by.

Phone Operation:

The power consumption of the phone in different situations, e.g. in stand-by or in
transmission, is ent irel y cont roll ed by t he phon e its elf, as the se powe r lev els ar e pro ­grammed and stored in the phone.

Battery Charger:

As the phone battery at all times is provided with current from the HandsFree Unit,
the charging of the battery, incl. trickle charging, is controlled by the phone itself.

For more information regarding the battery charging algorithms of the telephone,
refer to section 2,

Technical Description

, subsection

Battery Charging

.

Optional Accessories

Music Mute

An optional Music Mute unit can be connected to the HandsFree Unit and will
direct the amplified received audio signal to the car stereo speakers during the
handsfree conversation.

If the car stereo is equipped with a specific “mute” input, the optional Music Mute
Cable connected directly between this input and the HandsFree Unit will mute the
car stereo during the handsfree conversation.

Note:

Max. current load at Music Mute output is 200mA.

Goose-Neck Microphone

A Goose-Neck Microphone allows a more flexible microphone position for
improved sound quality incl. reduction of transmitted noise.

Data Extension

Data communication using handsfree mode is made possible by connecting a Data
Extension Unit between a modem and the Data Communication Connector.

30

External Handset

An External Handset will give the user the possibility to switch from handsfree to
handheld operation wit hout di sconnec ting t he power source . A Data Ext ensio n Unit
is required for the connection between the External Handset and the Data Commu­nication Connector.

Accessories

Specifications

HandsFree Unit

Type No: 502 0019-BV
Dimensions: 135 x 100 x 28 mm; 5.3 x 3.9 x 1.1 in
Input Voltage: 10.8 to 15.6 VDC
Ambient Temperature - Operating:

Ambient Temperature - Charging:

Cradle

Weight: 105g; 3.7 oz
Height: 95mm; 3.7 in
Depth (incl. cradle attachment): 54mm; 2.1 in

o

-25

C to +60oC; -13oF to +140oF

o

+10

C to +35oC; +50oF to +95oF

Width: 60mm; 2.4 in

31

Accessories

Connectors and Signals

Holder

System Connector

112

Note

: For pin assignments, refe r to column

next page.

HandsFree Unit

J4 J7 J6

J5

J1 J2

H-pin

of System Connector J1 table on

32

System Connector J1

Accessories

12

11

J1-pin H-pin Signal Specification

1 10 DGND Digital ground & DC return
2 12 DCIO DC voltage supply to phone power
3 4 AGND Audio signal ground & 0V reference
4 2 ATMS Audio to mobile station
5 - HOOKSNS Hook sense (connected to cradle, not phone)
6 1 AFMS Audio from m obile station
7 6 MUTE Music Mute
8 3 EXTAUD External analog audio accessory sense
9 5 PORTHF Portable handsfree sense
10 8 VDD Logic reference, status ON

2

1

11 9 DFMS Data from mobile station
12 11 DTMS Data to mobile station

J1-pin = HandsFree Unit System Connector J1 pin
H-pin = Holder System Connector pin

Power Connector J2

3

4

1

2

1 GND
2+12VDC
3 M UTEINV
4n.c.

33

Accessories

Microphone Connector J4

1 +10dB Stick-On microphone
2 0dB Goose-Neck microphone
3 AGND Signal ground

Microphone connector J4 is female
Picture shows corresponding male

Music Mute Connector J5

1 LSP- Loudspeaker common
2 DGN D Digital ground & DC return
3 LSP+ Loudspeaker signal
4 MUTE Music mute
5 DC12OUT +12VDC output

Music Mute connector J5 is male
Picture shows corresponding female

Data Communication Connector J6

1 MUTEINV Music Mute (inverted)
2 VDD Logic reference, status ON
3 DC12OUT +12VDC output
4 AFMS (RX) Audio from mobile station
5 D/V Data/voice signal
6 ATMS (TX) Audio to mobile station
7 PORTHF Portable handsfree sense
8 DTMS Data to mobile station
9 DFMS Data from mobile station
10 DGND Digital ground & DC return

Speaker Connector J7

34

1 LSP+ Loudspeaker signal
2 LSP- Loudspeaker common
3n.c.

Speaker connector J7 is female
Picture shows corresponding male

Vehicle HandsFree Solution HF7600

Introduction

Accessories

Vehicle Handsfree Solution HF7600

The
family telephones and includes apart from the handsfree facilities also a power sup­ply and battery charger for the phone.

The four main components are:

•

Cradle

•

Stick-on Microphone

•

External Speaker

•

HandsFree Unit

is specially designed for the Ericsson

7X8

-

HandsFree Features

After placing the telephone in the
trolled by the DSP (Digital Signal Processor) and its peripherals located in the
HandsFree Unit.

The handsfree communication is full duplex, i.e. both parties will be able to talk
simultaneously. Some attentuation can however be noticed on the land side during
simultaneous talking, whil e both speech chann els will be open on the mobil e side all
the time.

HF7600

holder, all handsfree functions are con-

35

Accessories

Echo Cancellation

To avoid acoustic feedback in a full duplex handsfree system, i.e. prevent the
speaker sound being picked up by the microphone from becoming amplified, the
DSP has to suppress these signals by Echo Cancellation. The DSP will be able to
distinguish transmitted speech from received echoed speech, if it is informed about
the acoustic environment of that particular vehicle where the handsfree kit is
installed. This is automatically done by an
being continuously updated.

adaptive training sequence

which is

Noise Reduction

The ambient noise of a driven vehicle is often too loud to allow an acceptable
speech quality when using handsfree. The DSP is however able to separate this
noise from the speech and reduce it to an acceptable level.

HandsFree Components

Cradle

The Cradle consists of two sub-units, the

Cradle Attachment

The Cradle is equipped with a slide joint which is adjusted during the installation to
a suitable vertical and horizontal angle for easy reach of the phone. The snap/click­in Holder connects the phone to the HandsFree Unit.

Cradle Attachment

and the

Holder

Holder

36

Stick-On Microphone

The Stick-On Microphone included in the kit is a unidirectional microphone to be
mounted in a fixed position in the vehicle and connected to the HandsFree Unit.

Accessories

External Speaker

Unless an optional Music Mute unit is utilised the 4Ω External Speaker has to be
connected to the speaker amplifier output of the HandsFree Unit.

Handsfree Un i t

The Handsfree Unit includes the following electronic blocks:

•

Digital Signal Processor (DSP)

•

Audio-To-Mobile-Station

•

Audio-From-Mobile-Station

•

Microphone Amplifier

•

Speaker Amp lifier

•

Music Mute Control

•

Power Supply

Digital Signal Processor (DSP)

The main functions of the Digi tal Signal Pro cessor are to reduc e the ambient audi ble
noise and to suppre ss the sp eaker sound aft er being p icked u p by the mic rophone , so
called echo cancellation. The circuitry around the DSP includes memories like
ROM, EEPROM, and SRAMs.

Audio-To-Mobile-Station

The digital output from the DSP is D/A-converted and amplified by the Audio-To­Mobile-Station block. The audio signal passes through an analog multiplexer and a
latch when enabled, which occur s when the signal MUTE from the phone goes hi gh,
i.e. when a conversation is initiated by the phone. The a udi o s ignal is supplied from
the latch to the phone via the ATMS pin of the System Connector.

Audio-From-Mobile-Station

The analogue audio signal from the phone is received via the AFMS pin of the Sys­tem Connector and supplied to the Audio-From-Mobile-Station block, where the
level of the signal is reduced by an amplifier and then A/D-converted.

Microphone Amplifier

The low level signal from the microphone is amplified and filtered by the Micro­phone Amplifier which also includes an A/D-converter. The signal level is reduced
prior to being digitised in order not to exceed the max. allowed peak voltage at the
input of the A/D-converter.

Speaker Amplifier

The digital speaker si gnal fr om th e DSP is D/A-converted, fed th rou gh an anal ogue
multiplexer, and a latch. The final stage of the Speaker Amplifier includes the
power amplifier which is able to supply approximately 7W into a 4Ω speaker. The
+12V power supplied to the Speaker Amplifier is switched on and off by the phone
via the DCIO pin of System Connector.

37

Accessories

Music Mute Control

An optional Music Mute unit is supplied with +12V via the DC12OUT pin of the
Music Mute Connector. The Music Mute function is controlled from the phone by
the MUTE signal of the Sys tem Conne cto r via the DSP, a latch, and f inally a switch ­ing transistor in the Music Mute Control block.

Power Supply

The HandsFree Unit is able to deliver up to 950mA to the phone for operation and
battery charging.

Phone Operation:

The power consumption of the phone in different situations, e.g. in stand-by or in
transmission, is ent irel y contro lled by the phon e itsel f, as these power l evels are pro­grammed and stored in the phone.

Battery Charger:

As the phone battery at all times is provided with current from the HandsFree Unit,
the charging of the battery, incl. trickle charging, is controlled by the phone itself.

For more information rega rd ing rega rding t he batte ry ch ar ging al gorit hms of the tel­ephone, refer to section 2,

Technical Description

, subsection

Battery Charging

.

Optional Accessories

Music Mute

An optional Music unit can be connected to the Handsfree Unit and will direct the
amplified received audio signal to the car stereo speakers during the handsfree con­versation.

If the car stereo is equipped with a specific “mute” input, the optional Music Mute
Cable connected directly between this input and the Handsfree Unit will mute the
car stereo during the handsfree conversation.

Note:

Max. current load at Music Mute output is 200mA.

Goose-Neck Microphone

A Goose-Neck Microphone allows a more flexible microphone position for
improved sound quality incl. reduction of transmitted noise.

38

Data Extension

Data communication using handsfree mode is made possible by connecting a Data
Extension Unit between a modem and the Data Communication Connector.

Accessories

External Handset

An External Handset will give the user the possibility to switch from handsfree to
handheld operation with out dis connec ting t he power source . A Data Ext ension Unit
is required for the connection between the External Handset and the Data Commu­nication Connector.

Specifications

Handsfree Un i t

Type No: 502 0020-BV
Dimensions: 135 x 100 x 28 mm; 5.3 x 3.9 x 1.1 in
Input Voltage: 10.8 to 15.6 VDC
Ambient Temperature - Operating:

Ambient Temperature - Charging:

o

-25

C to +60oC; -13oF to +140oF

o

+10

C to +35oC; +50oF to +95oF

Cradle

Weight: 105g; 3.7 oz
Height: 95mm; 3.7 in
Depth (incl. cradle attachment): 54mm; 2.1 in
Width: 60mm; 2.4 in

39

Accessories

Connectors and Signals

Holder

System Connector

112

Note

: For pin assignments, refe r to column

next page.

HandsFree Unit

J4 J7 J6

J5

J1 J2

H-pin

of System Connector J1 table on

40

System Connector J1

Accessories

12

11

J1-pin H-pin Signal Specification

1 10 DGND Digital ground & DC return
2 12 DCIO DC voltage supply to phone power
3 4 AGND Audio signal ground & 0V reference
4 2 ATMS Audio to mobile station
5 - HOOKSNS Hook sense (connected to cradle, not phone)
6 1 AFMS Audio from m obile station
7 6 MUTE Music Mute
8 3 EXTAUD External analog audio accessory sense
9 5 PORTHF Portable handsfree sense
10 8 VDD Logic reference, status ON
11 9 DFMS Data from mobile station

2

1

12 11 DTMS Data to mobile station

J1-pin = HandsFree Unit System Connector J1 pin
H-pin = Holder System Connector pin

Power Connector J2

3

4

1

2

1 GND
2+12VDC
3 M UTEINV
4n.c.

41

Accessories

Microphone Connector J4

1 +10dB Stick-On microphone
2 0dB Goose-Neck microphone
3 AGND Signal ground

Microphone connector J4 is female
Picture shows corresponding male

Music Mute Connector J5

1 LSP- Loudspeaker common
2 DGN D Digital ground & DC return
3 LSP+ Loudspeaker signal
4 MUTE Music mute
5 DC12OUT +12VDC output

Music Mute connector J5 is male
Picture shows corresponding female

Data Communication Connector J6

1 MUTEINV Music Mute (inverted)
2 VDD Logic reference, status ON
3 DC12OUT +12VDC output
4 AFMS (RX) Audio from mobile station
5 D/V Data/voice signal
6 ATMS (TX) Audio to mobile station
7 PORTHF Portable handsfree sense
8 DTMS Data to mobile station
9 DFMS Data from mobile station
10 DGND Digital ground & DC return

Speaker Connector J7

42

1 LSP+ Loudspeaker signal
2 LSP- Loudspeaker common
3n.c.

Speaker connector J7 is female
Picture shows corresponding male