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Internship at Motorola Telematics
Henning Michael Koehler 1/14/2002 6/14/2002
Design of a Universal Hands free Interface
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MOTOROLAbased in Chicago, IL
Cell phones Semi-conductors Cable
modems Automotive technology Telematics (since
1998) 110 000 employes in 2001 Net sales 30
billion Net earnings 1.3 billion
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What is Telematics?
Integrates Telecommunication and Information
Technology Convenience Safety Teleaid Telediagno
se Free speech Internet access
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Universal Handy Interface (UHI)

• Today Buy the phone with the car
• Tomorrow Bring your own cell phone
• Pluck into cradle or wireless (Bluetooth)
• Connects to a GSM / UMTS Antenna
• Shows your phone book and SMS on the car display
• Dial numbers with your voice, use the steering
  wheel
• Free speech (microphones and loudspeakers)
• uses fiber optics cable (D2B, MOST)

Mercedes E-Class Europe
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UHI System Diagram
Cradle from Dealer Peiker
Nokia
Motorola
Siemens
or
or
or ...
D2B or MOST
Micro Array
Mounting plate
CAN
GSM
Bluetooth
Compensator
HU
, -
UHIMotorola

• Cradle interface
• HF Mic/- to Cradle
• HF Spkr /- from Cradle
• 4 Wire RS422 data to/from Cradle

Speaker
factory installed
dealer
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Designing for the automotive EnvironmentAlways
prevent a FIRE
Designing for the automotive environment reliabil
ity and safety Operation range 9.6 to 16.4
V Temperature range -40 to 85 C Protection
diodes Worst case analysis (FMEA) Shorts to
ground Shorts to battery Car must not break down
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Henning in his cube
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Chicago, IL
St. Patricks Day Parade Meeting the President