Notes:
• Use either the
Unilateral Authentication
or
Bilateral Authentication
options for inside or outside localization.
• Each time any of the PEPS command buttons (
Start
/
Stop
,
Unlock
or
Lock
) are clicked, a new PEPS wake-up
signal is generated. Once the fob receives the wake-up signal, the LED on the fob blinks and the PEPS
Message Status window information is updated.
• A continuous polling sequence can be achieved by selecting the “Polling” check box in the “PEPS Features”
section of the System Configuration window. This polling feature can be used to dynamically determine the
PEPS fob area coverage in real-time with the PEPS results displaying in the PEPS Message Status window.
5.3.8
UWB Communication
The UWB communication functionality can be tested using the CARS PC application running on the host PC as
follows:
1.
If not done already, follow the procedure detailed in
4. CARS Kit PC Evaluation Utility
.
2.
If not done already, follow the calibration procedure detailed in
5.3.5. Fob Calibration Process
3.
Position the fob at the desired distance from the base station hardware that will be used for the fob’s relay
attack threshold.
4.
Navigate to
View > PEPS Messaging
to open the PEPS Message Status window (see
5.
Select the
Unilateral Authentication
radio option, click the
Unlock
button and, after the authentication
sequence completes, note the value of the number in the “TOF Measured (cm)” field of the PEPS Message
Status window. Enter this value in the “Relay Attack Threshold (cm)” field of the System Configuration window
(see
).
6.
Move the fob closer to the base station hardware.
7.
Select the
Unilateral Authentication
radio option, click the
Unlock
button within the PEPS Message Status
window to execute the unilateral authentication sequence.
Note:
The “LF Encrypted Challenge” field is not populated as this data is not transmitted to the fob.
For example, the results of a PEPS unilateral authentication sequence display (see the following figure). With
the “Relay Attack Threshold (cm)” as
20 cm
and the measured value distance scale, “TOF Measured (cm)” as
19 cm
, the system is not experiencing a relay attack; therefore, no Relay Attack icon is displayed.
Figure 5-21. PEPS Unilateral Authentication with No Relay Attack Icon
8.
Move the fob further away from the base station hardware, beyond the location used in step 3 but still within
the UWB operating range.
9.
Select the
Bilateral Authentication
radio option, then click the
Unlock
button within the PEPS Message Status
window to execute the bilateral authentication sequence. Confirm that the “LF Encrypted Challenge” field is
now populated.
For example, the results of a PEPS bilateral authentication sequence display (see the following figure). With
the “Relay Attack Threshold (cm)” as
20 cm
and the measured value distance scale, “TOF Measured (cm)” as
34 cm
, the system is experiencing a relay attack; therefore, the Relay Attack icon displays.
ATAN0219
System Operation
©
2020-2022 Microchip Technology Inc.
and its subsidiaries
User Guide
DS50003051B-page 33