UJA1169L
Mini high-speed CAN companion system basis chip
Rev. 1 — 15 February 2016
Product data sheet
1. General description
The UJA1169L mini high-speed CAN companion System Basis Chip (SBC) belongs to the
UJA1169 product series and can be used as a companion chip in applications where a
second SBC is dedicated to the application microcontroller. It contains an ISO
11898-2:201x (upcoming merged ISO 11898-2/5/6) compliant HS-CAN transceiver and an
integrated 5 V 250 mA scalable supply (V1) for additional transceivers and/or other loads.
It also features a watchdog and a Serial Peripheral Interface (SPI). The UJA1169L
companion SBC can be operated in very low-current Standby and Sleep modes with bus
and local wake-up capability.
The UJA1169L is designed to be used in applications that require more than one
transceiver or additional power supply resources. Using a standard device as the
secondary SBC in an application can be problematic. The secondary SBC will have a
different interface supply domain to the main SBC, creating a high risk of reverse supply
currents. The UJA1169L resolves this issue by providing a dedicated VIO input pin that
allows it to adapt to any other supply domain.
Incorporating the UJA1169L companion SBC in an application allows it to be easily scaled
or extended by adding, for example, an additional 5 V power supply, CAN transceiver,
off-board 5 V sensor supply or even a secondary independent watchdog function with
independent LIMP output for special ASIL-related applications.
The UJA1169L comes in four variants. The UJA1169LTK and UJA1169LTK/F feature a
second on-board 5 V regulator (V2) that supplies the internal CAN transceiver and can
also be used to supply additional on-board hardware.
The UJA1169LTK/X and UJA1169LTK/X/F are equipped with a 5 V supply (VEXT) for
off-board components. VEXT is short-circuit proof to the battery, ground and negative
voltages. The integrated CAN transceiver is supplied internally via V1.
The UJA1169LTK/F and UJA1169LTK/X/F variants support ISO 11898-6:2013 and
ISO 11898-2:201x compliant CAN partial networking with a selective wake-up function
incorporating CAN FD-passive. CAN FD-passive is a feature that allows CAN FD bus
traffic to be ignored in Sleep/Standby mode. CAN FD-passive partial networking is the
perfect fit for networks that support both CAN FD and classic CAN communications. It
allows normal CAN controllers that do not need to communicate CAN FD messages to
remain in partial networking Sleep/Standby mode during CAN FD communication without
generating bus errors.
The UJA1169L implements the standard CAN physical layer as defined in the current
ISO11898 standard (-2:2003, -5:2007, -6:2013). Pending the release of the upcoming
version of ISO11898-2:201x including CAN FD, additional timing parameters defining loop
delay symmetry are included. This implementation enables reliable communication in the
CAN FD fast phase at data rates up to 2 Mbit/s.