User's Manual

Title : User manual of IM900 Immobilizer Spec. No. : N/A
Written by : SUNG HUN AHN Rev. No. : Revision A
Date :2007.11.07 Page : 7 / 10
Technical Center Automotive Electronics
4.2 Coil Antenna
4.2.1 Coil Antenna Mounting
The Coil Antenna is mounted at the Accessory lock in front of the key barrel. It is integrated to the ICU
housing package with a body of the coil to improve the performance of transponder reading and EMC.
4.2.2 Coil Antenna Function
The Coil Antenna and receiving coil inside the transponder built a transformer. During the reading process
the coil induces energy into the transponder. The transponder charges the field and generates an amplitude
modulated signal with the Manchester coded data. This charge of the field is demodulated inside the
Immobilizer.
4.2.3 Electrical Spec. of Coil Antenna
- Operating temperature -40℃ to +90℃
- Turns 80
- Inductance (not on Accessory lock) 1073uH +/- 5 u measured at 125 KHz
- DC resistance 11 Ohm +/- 5%
- Cu-wire (diameter) 0.28 mm
4.2.4 Coil Driver
The Immobilizer contains the coil driver hardware for direct connection of the Coil Antenna.