TCAN330 Datasheet, PDF (24/39 Pages) Texas Instruments – CAN Transceivers

TCAN330, TCAN332, TCAN334, TCAN337
TCAN330G, TCAN332G, TCAN334G, TCAN337G
SLLSEQ7A – DECEMBER 2015 – REVISED JANUARY 2016
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For a dominant or recessive to be considered filtered, the bus must be in that state for more than t_{WK_FILTER} time.
Due to variability in the t_{WK_FILTER} the following scenarios are applicable. Bus state times less than t_{WK_FILTER(MIN)}
are never detected as part of a WUP and thus no BWRR is generated. Bus state times between t_{WK_FILTER(MIN)}
and t_{WK_FILTER(MAX)} may be detected as part of a WUP and a BWRR may be generated. Bus state times more
than t_{WK_FILTER(MAX)} are always detected as part of a WUP and thus a BWRR is always generated.
See Figure 33 for the timing diagram of the WUP. The pattern, t_{WK_FILTER} time used for the WUP and BWRR
prevent noise and bus stuck dominant faults from causing false wake requests. If the device is switched to
normal mode, or an under voltage event occurs on V_CC the BWRR will be lost.
Filtered
Dominant
Waiting for
Filtered
Recessive
Wake Up Pattern (WUP)
Filtered
Recessive
Waiting for
Filtered
Dominant
Filtered
Dominant
Wake Request via RXD
Bus
Bus VDiff
• tWK_FILTER
• tWK_FILTER
• tWK_FILTER
• tWK_FILTER
RXD
Figure 33. Wake Up Pattern (WUP) and Bus Wake via RXD Request (BWRR)
10.4.6 Shutdown Mode
This is the lowest power mode of all of the devices. The CAN driver and receiver are turned off and bi-directional
CAN communication is not possible. It is not possible to receive a remote wake request via the CAN bus in this
mode. The CAN bus pins are pulled to GND during this mode as shown in Figure 31.
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