PKE System Design Using the PIC16F639

JasonYoo

PKE System Design Using the PIC16F639 [复制链接]

Hands-free Passive Keyless Entry (PKE) is quickly
becoming mainstream in automotive remote keyless
entry applications and is a common option on new
automobile models. Instead of pressing a transmitter
button to unlock or lock a car door, it is possible to gain
vehicle access simply having a valid transponder in
your possession.
Hands-free PKE applications require bidirectional
communication between the base station and
transponder units. The base unit inside the vehicle
transmits a Low-Frequency (LF) command that
searches for a transponder in the field. Once located,
the transponder in the vehicle owner?s possession then
automatically responds to the base unit. The base unit
then unlocks the car doors, if a valid authentication
response is received.

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