User's Guide
Table Of Contents
- Introduction
- Features
- Table of Contents
- 1. Quick References
- 2. Kit Overview
- 3. Kit Setup
- 4. CARS Kit PC Evaluation Utility
- 5. System Operation
- 6. Programming Instructions
- 7. XPRO USB Driver Installation
- 8. Document Revision History
- The Microchip Website
- Product Change Notification Service
- Customer Support
- Microchip Devices Code Protection Feature
- Legal Notice
- Trademarks
- Quality Management System
- Worldwide Sales and Service
Note: RF and UHF are used interchangeably in this document. For more details on the RKE protocol, refer to the
AVR411: Secure Rolling Code Algorithm for Wireless Link Application Note.
2.3 PEPS Block
The PEPS functionality provides the user with a means to lock/unlock and start a vehicle just by having the electronic
fob with them, without the need to actively interact with it. It consists of an LF coil driver placed in the vehicle, which
generates a strong magnetic field on multiple (optional) LF PEPS antennas.
The passive fob implemented in the PEPS system can wake up on this LF field and receive the incoming data via the
unidirectional LF link. The fob also measures the strength of the magnetic field, which is used to determine the
position of the fob relative to the vehicle (outside or inside). Then, it encrypts the received challenge data (using AES)
and returns the correct cipher response, together with the positioning information, to the vehicle via the unidirectional
UHF link.
Note: For more details on the PEPS protocol, refer to the ATAN0073 Short Form Description of the Atmel PEPS
System Application Note.
ATAN0219
Kit Overview
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User Guide
DS50003051A-page 6
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