Product data

UJA1167 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet Rev. 2 — 18 April 2014 22 of 60
NXP Semiconductors
UJA1167
Mini high-speed CAN system basis chip with Standby/Sleep modes &
watchdog
6.7.2 CAN standard wake-up
If the CAN transceiver is in Offline mode and CAN wake-up is enabled (CWE = 1), the
UJA1167 will monitor the bus for a wake-up pattern.
A filter at the receiver input prevents unwanted wake-up events occurring due to
automotive transients or EMI. A dominant-recessive-dominant wake-up pattern must be
transmitted on the CAN bus within the wake-up timeout time (t
to(wake)
) to pass the wake-up
filter and trigger a wake-up event (see Figure 6
; note that additional pulses may occur
between the recessive/dominant phases). The recessive and dominant phases must last
at least t
wake(busrec)
and t
wake(busdom)
, respectively.
(1) To prevent the bus lines being driven to a permanent dominant state, the transceiver will not switch to CAN Active mode or CAN
Listen-only mode if pin TXD is held LOW (e.g. by a short-circuit to GND)
Fig 5. CAN transceiver state machine (with FNMC = 0)
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