T he Ma in P IC µC o ntro lle r is the he a rt o f the Ve hicle ne two rk functio ns. Its jo b is to re a d ne two rk m e ssa ge s fro m the spe cific subse ctio ns, tim e sta m p the m a nd se nd the m to the Ma in 51 µC o ntro lle r.
T he Ma in P IC µC o ntro lle r is dire ctly re spo nsible fo r the MISC 1 a nd MISC 2 signa ls, the J1708 pro to co l, a nd co nfigura tio n o f the LBC C a nd C AN co ntro lle rs. As the o wne r o f the tim e sta m p clo ck , the Ma in P IC ge ne ra te s the tim e -
sta m p clo ck fo r the DAQ pa ce r functio na lity. It a lso o wns the trigge r signa ls fo r J1708, Fo rd SC P (LBC C ), a nd a ll o f the C AN ne two rk s.
T he Ma in P IC µC o ntro lle r is pro te cte d by a inte rna l wa tchdo g tim e r a nd co ntro ls the re se t line s fo r a ll o f the o the r circuits.
Figure 3 - The Main PIC µController
CA N Networks
ne o VI ha s fo ur inde pe nde nt C AN ne two rk s. T he C AN pro to co l IC is the MC P 2510 IC fro m Micro chip Te chno lo gy. Ea ch pro to co l chip, is co nne cte d to the a ppro pria te physica l la ye r fo r tha t C AN ne two rk . All sta tus a nd co ntro l signa ls
fo r e a ch physica l la ye r a re m a ppe d to inte rna l µC o ntro lle r pins. T his a llo ws co m ple te so ftwa re co ntro l o f the C AN functio na lity.
Figure 4 - The neoVI CA N Networks
LBCC Protocol IC
T he LBC C pro to co l is a pro to co l IC fro m Viste o n which pe rfo rm s the J1850 P W M Fo rd SC P pro to co l. It suppo rts a pro gra m m a ble functio n id ta ble with 31 lo ca tio ns, a pro gra m m a ble ne two rk a ddre ss, a nd two pro gra m m a ble
functio n re a d da ta re giste rs.
Figure 5- The neoVI LBCC interface
ISO/J PIC µController Section
T he ISO /J P IC µC o ntro lle r m a in functio na lity is to ge ne ra te the J1850 VP W a nd ISO /UAR T pro to co ls. O the r re spo nsibilitie s include the fo llo wing: 1) LED C o ntro l, 2) R e a l-T im e C lo ck Inte rfa cing, 3) O n-bo a rd Te m pe ra ture Se nso r
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Theory of Operation
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Summary of Contents for neoVI
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