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Tire Pressure Monitoring System User’s Guide
3.2.6
Operation Overview
The Base Station schedules when each tire is polled. The Base Station transmits the
command to wake up the Transponder Sensor module to each LF Initiators individually
on the LIN network. The command issued to LF Initiator contains a unique ID that was
pre-assigned to each Initiator. This command will be issued maximum of three times if
the previous attempt failed. The LF Initiator transmits a wake up command containing
the two bytes of data from the base station to the Transponder Sensor module. The
Base Station will then wait for an incoming RF data message stream from the
Transponder Sensor module which will also contain the LF Initiator ID to distinguish the
tire position.
FIGURE 3-1:
LIN MESSAGE COMMAND
Message Frame
inter-frame
Header
Data
space
or BREAK
Synch
Break
Synch
Field
Ident
Field
Position Mode Checksum
ID ID Field
in-frame
response space
When the Learn Button (S1) is pressed, the Base Station places a Learn Mode ID in
the second data byte of the message. The Base Station then issues the learn command
sequentially to each LF initiator which in turn, transmits the command to the Transpon-
der Sensor module. The Base Station waits for the Transponder Sensor to transmit
back a message via UHF (the number of LF Initiators on the LIN network will determine
how many messages to be expected by the Base Station and this must be defined by
the user in the firmware). After a predetermined time has expired, an error message is
displayed on the LCD if all the expected messages are not received.
DS51624B-page 12
? 2006 Microchip Technology Inc.
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