TCAN330_16 Datasheet, PDF (9/40 Pages) Texas Instruments – 3.3-V CAN Transceivers with CAN FD (Flexible Data Rate)

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TXD (driver)
Normal CAN
communication
CAN
Bus
Signal
TXDDTO
Flag
TCAN330, TCAN332, TCAN334, TCAN337
TCAN330G, TCAN332G, TCAN334G, TCAN337G
SLLSEQ7D – DECEMBER 2015 – REVISED APRIL 2016
TXD fault stuck dominant, example PCB
failure or bad software
t_{TXD_DTO}
Driver disabled freeing bus for other nodes
Fault is repaired & transmission
capability restored
t_{TXD_DTO}
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whole network but TXD DTO prevents this and frees the bus for
communication after the time t_{TXD_DTO}.
Communication from
other bus node(s)
Communication from
repaired node
FAULT is signaled to link layer / protocol.
Fault indication is removed.
RXD
(receiver)
Communication from
local node
Communication from
other bus node(s)
Communication from
repaired local node
Figure 1. Example Timing Diagram for TXD DTO and FAULT Pin
Normal CAN
communication
Bus Fault stuck dominant, example CANH
short to supply and CAN L short to GND.
Fault is repaired and normal
communication returns
CAN Bus
Signal
RXD
(reciever)
RXDDTO
FLAG
t_{RXD_DTO}
RXD output is returned recessive (high) and
FAULT is signaled to link layer / protocol.
RXD mirrors
bus
FAULT cleared
signal is given
Figure 2. Example Timing Diagram for RXD DTO and FAULT Pin
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