User's Guide

• “PEPS Features” – This section includes configuration settings that affect PEPS messaging functions, including
the type of authentication during polling, as well as, a polling interval.
– “Unilateral and Bilateral Authentication” – Selecting either of these radio buttons has an effect on the type
of communication used during polling only.
– “Polling”– Range checking and the determination of a desired threshold performance can easily be done
with polling. Selecting this check box starts the polling cycle, which repeats at a rate set in milliseconds.
Note: 500 ms is the minimum allowable value.
– “In/Out Threshold” – Used to determine if a fob is inside or outside of the vehicle by comparing the distance
scale result against the in/out threshold value. The boundary value is user-definable and can be specified
by entering a new value (1-599) in this field.
– “Priority Fob” – This drop-down list allows users to specify which fob is given priority when responding to a
PEPS command following the common slot of the anti-collision process.
• “PEPS Fob Actions” – This section allows for selection and communication with an individual fob even with other
PEPS fobs present.
– “Selected Fob” – This drop-down list allows direct access to an individual fob. Selecting “Broadcast” allows
communication with any fob, even unlearned ones. This facilitates accessing a fob ID even if the vehicle ID
for that specific fob is unknown.
– “Fob ID” – This button provides a way to access the current fob ID, the vehicle ID and the battery status.
– “S/W Ver” – This button requests the current fob software version.
– “Low Bat” – This check box is selected by the software if the battery voltage in the current fob is below the
low battery threshold (approximately 2.6V).
– “Fob Vehicle ID” – Displays the vehicle ID stored within the current fob.
– “LF Test” – This tab displays all the details relating to a test LF field measurement. Details such as the
external, internal RSSI values and coil phase clock counts display here. The distance scale value is
determined by the combined result of all post-RSSI processing. In a standard PEPS message, the distance
scale and the coil phase values are sent.
– “Parameter Access” – This tab displays general user memory sections of the fob EEPROM that can be
accessed via the PEPS system link. These are configured into 32 blocks of memory with each block having
16 bytes of data available. The data can be displayed in HEX or ASCII format. To access the memory, the
fob must first be put into a password-protected diagnostic mode by clicking the “Enter Diag” button. Then,
for several seconds, the fob responds to read or write commands.
– “Calibrate Fob” – This button initiates a calibration cycle, which provides reference values as each fob LF
antenna coil axis has slightly different gains due to the antenna coil, capacitor and IC tolerances. This is
typically done at the end-of-line testing by the manufacturer and is necessary to achieve consistent results.
It only needs to be performed once for each fob.
5.3.2 PEPS Message Status Window Overview
The PEPS Message Status window displays the challenge or response information along with localization details for
each fob that is learned to the system. In the Car Access System PC Application window, navigate to View > PEPS
Messaging to open the PEPS Message Status window, as shown in the following figure.
ATAN0219
System Operation
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User Guide
DS50003051A-page 17
Microchip Confidential: For Release Only Under Non-Disclosure Agreement (NDA)