Nokia 2110i, 2110 Handset 1
After Sales Technical Documentation
Handset HSU–1
Original 50/96
NMP Part No. 0275276
After Sales
Handset HSU–1
CONTENTS
Handset HSU–1 – 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction – 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical Summary – 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Use of Handset – 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical Specifications – 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Modes of Operation – 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum Ratings – 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC Characteristics – 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AC Characteristics – 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Microphone Side – 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Earphone Side – 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sidetone – 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
External Signals and Connections – 5. . . . . . . . . . . . . . . . . .
External Connections – 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Description – 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Description – 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Earphone Amplifier – 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Microphone Amplifier – 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HOOK Operation – 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage Regulator – 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Block Diagram – 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Diagram version 6.0 – 8. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Layout Diagrams – 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts List of DG1 (Version 1.1) Code 0200221 – 10. . . . . . . . .
Exploded view – 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Assembly parts – 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical Documentation
Page – 2
Original 50/96
After Sales
Technical Documentation
Handset HSU–1
Introduction
Main function of the HSU–1 Audio Handset is to form an electroacoustic
interface between the user and the phone environment.
Handset HSU–1
Technical Summary
The HSU–1 Audio Handset consists of handset with coil cord and of
cradle. In the handset there is earphone and microphone with corre-
sponding amplifiers. There is also a simply interface for controlling these
functions. Electronics consist of DG–1 handset module. Mechanical di-
mensions are small and mechanics consists of A–cover, B– cover and coil
cord with the cradle. The HSU–1 Audio Handset has a volume potentiom-
eter.
Use of Handset
The HSU–1 Audio Handset is designed to be a dummy handset with no
display and no keyboard. Its use is to form an electroacouistical connec-
tion between the user and DCT – environment. When not in use the
handset is on the cradle. During the use the handset is lifted from the
cradle and audio paths are opened.
Original 50/96
Page – 3
After Sales
Handset HSU–1
Technical Specifications
Modes of Operation
DG–1 module has only one mode of operation. Audio paths will become
active when the handset is lifted from the cradle. Otherwise muting is on.
Maximum Ratings
–supply voltage: 16.0 V
–operation temperature range, specification: – 25 ––– + 55 C
–operation temperature range, operational: – 25 ––– + 85 C
–storage temperature range: – 40 ––– + 85 C
DC Characteristics
Technical Documentation
Symbol Parameter Minimum Typical/ Maximum
VBS Supply voltage for electronics 9.0 V 13.2 V 16.0 V
Ihs Handset current consumption 6.0 mA 8.0 mA 12.0 mA
Vaudio Regulated audio voltage 7.7 V 8.3 V 8.7 V
Iaudio Audio current consumption 6.0 mA 8.0 mA 12.0 mA
AC Characteristics
Microphone Side
Microphone amplifier gain for nominal signal is approx. 30 dB. Max output
level is 1 Vrms. Idle noise of microphone amplifier should be less than
–64 dBmOp (220 uV). Output impedance is < 300 ohms.
Earphone Side
Earphone amplifier input level is max. 503 mVrms. Acoustic idle noise of
earphone is under –60 dBPa. Input impedance of earphone amplifier is >
10 kohm.
Nominal
Sidetone
Page – 4
To be defined later.
Original 50/96
After Sales
Technical Documentation
External Signals and Connections
The HSU–1 Audio Handset has an 8 pin modular connector at the end of
the coil cord to the junction box. There are only five lines in use in the coil
cord.
External Connections
Handset HSU–1
Functional Description
Main function of The HSU–1 Audio Handset is to form an electroacoustic
interface between the user and the phone environment. The HSU–1 Au-
dio Handset consists of handset with coil cord and of cradle. In the hand-
set there is earphone and microphone with corresponding ampli-
fiers.There is also a simply interface for controlling these functions. Elec-
tronics consist of DG1 handset module. Mechanical dimensions are small
and mechanics consists of A–cover, B–cover and coil cord with the
cradle. The HSU–1 Audio Handset has a volume potentiometer.
Circuit Description
HSU–1 Audio Handset consists of the following functional blocks:
– Earphone amplifier
– Microphone amplifier
Original 50/96
Page – 5
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