Product data

Product data sheet Rev. 2 — 18 April 2014 21 of 60

NXP Semiconductors

UJA1167

Mini high-speed CAN system basis chip with Standby/Sleep modes &

watchdog

• the SBC switches to Reset or Standby or Sleep mode OR

• the SBC is in Normal mode and CMC = 00

provided the CAN-bus has been inactive for at least t

to(silence)

. If the CAN-bus has been

inactive for less than t

to(silence)

, the CAN transceiver switches first to CAN Offline Bias

mode and then to CAN Offline mode once the bus has been silent for t

to(silence)

The CAN transceiver switches to CAN Offline/Offline Bias mode from CAN Active mode if

CMC = 01 and the voltage on V1 drops below the 90 % undervoltage threshold or

CMC = 10 and the voltage on V1 drops below the V1 reset threshold.

The CAN transceiver switches to CAN Offline mode:

• from CAN Offline Bias mode if no activity is detected on the bus (no CAN edges) for

t> t

to(silence)

• when the SBC switches from Off or Overtemp mode to Reset mode

The CAN transceiver switches from CAN Offline mode to CAN Offline Bias mode if:

• a standard wake-up pattern (according to ISO11898-5) is detected on the CAN bus

• the SBC is in Normal mode, CMC = 01 and V

<90 %

6.7.1.4 CAN Off mode

The CAN transceiver is switched off completely with the bus lines floating when:

• the SBC switches to Off or Overtemp mode OR

• V

BAT

falls below the CAN receiver undervoltage detection threshold, V

uvd(CAN)

It will be switched on again on entering CAN Offline mode when V

BAT

rises above the

undervoltage recovery threshold (V

uvr(CAN)

) and the SBC is no longer in Off/Overtemp

mode. CAN Off mode prevents reverse currents flowing from the bus when the battery

supply to the SBC is lost.