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
5. System Operation
The system includes the following features:
• Immobilizer functionality:
– Supports AOIP
– Support for AES-128 encryption
– Passive fob authentication supporting unidirectional authentication (UA)
– Support for base station to transponder key learn sequence used during the learning procedure
– Support for several utility immobilizer commands (such as communication or transponder data
management)
• RKE functionality:
– Support for unidirectional AES-based rolling code protocol
– Use of multiple channel UHF messaging provides robustness against the effects of multipath or in-band
interference
• PEPS wake-up functions:
– Selectable LF driver coil
– Selectable LF driver current (I
COIL
= 50 mA to 1000 mA)
– LF driver polling support
– Configurable preamble and header settings for LF wake-up via source code updates
– Unidirectional UHF data return channel included
5.1 Immobilizer Operation
The immobilizer functionality is tested using the base station hardware (ATSAMC21-XPRO/ATA5291-XPRO/LF
antenna module) and the ATAB5702A fob board. The CARS PC application displays the UID, challenge, response
and result of the authentication in the Immobilizer Status window each time the authentication command is executed.
Perform the following steps to test the immobilizer using the CARS PC application running on the host PC:
1. If not done so already, follow the procedure detailed in 4. CARS Kit PC Evaluation Utility.
2. Navigate to View > Immobilizer. The Immobilizer Status window shows the following data fields:
Figure 5-1. Immobilizer Status Window
– “Immobilizer UID” – Displays the unique ID value received from the fob
– “Immobilizer Challenge” – Displays the most current challenge data sent to the fob
– “Immobilizer Response” – Displays the most current response data received from the fob
– “Immobilizer Result” – Displays the authentication status
– “Log file” – Selecting this check box creates a new record line in a comma-separated variable (CSV)
document for each received message when it is selected.
ATAN0219
System Operation
© 2020 Microchip Technology Inc.
User Guide
DS50003051A-page 13
Microchip Confidential: For Release Only Under Non-Disclosure Agreement (NDA)