UJA1078ATW/5V0/WDJ Datasheet PDF - NXP

●Overview

●The UJA1078A core System Basis Chip (SBC) replaces the basic discrete components commonly found in Electronic Control Units (ECU) with a high-speed Controller Area Network (CAN) and two Local Interconnect Network (LIN) interfaces.

●The UJA1078A supports the networking applications used to control power and sensor peripherals by using a high-speed CAN as the main network interface and the LIN interfaces as local sub-busses.

●The core SBC contains the following integrated devices:

● High-speed CAN transceiver, inter-operable and downward compatible with CAN transceiver TJA1042, and compatible with the ISO 11898-2 and ISO 11898-5 standards

● LIN transceivers compliant with LIN 2.1, LIN 2.0 and SAE J2602, and compatible with LIN 1.3

● Advanced independent watchdog (UJA1078A/xx/WD versions)

● 250 mA voltage regulator for supplying a microcontroller; extendable with external PNP transistor for increased current capability and dissipation distribution

● Separate voltage regulator for supplying the on-board CAN transceiver

● Serial Peripheral Interface (SPI) (full duplex)

● 2 local wake-up input ports

● Limp home output port

●In addition to the advantages gained from integrating these common ECU functions in a single package, the core SBC offers an intelligent combination of system-specific functions such as:

● Advanced low-power concept

● Safe and controlled system start-up behavior

● Detailed status reporting on system and sub-system levels

●The UJA1078A is designed to be used in combination with a microcontroller that incorporates a CAN controller. The SBC ensures that the microcontroller always starts up in a controlled manner.

●MoreLess

●## Features

●2.1 General

● Contains a full set of CAN and LIN ECU functions:

● CAN transceiver and two LIN transceivers

● Scalable 3.3 V or 5 V voltage regulator delivering up to 250 mA for a microcontroller and peripheral circuitry; an external PNP transistor can be connected for better heat distribution over the PCB

● Separate voltage regulator for the CAN transceiver (5 V)

● Watchdog with Window and Timeout modes and on-chip oscillator

● Serial Peripheral Interface (SPI) for communicating with the microcontroller

● ECU power management system

● Designed for automotive applications:

● Enhanced ElectroMagnetic Compatibility (EMC) performance

● ±8 kV ElectroStatic Discharge (ESD) protection Human Body Model (HBM) on the CAN/LIN bus pins and the wake-up pins

● ±6 kV ElectroStatic Discharge protection IEC 61000-4-2 on the CAN/LIN bus pins and the wake-up pins

● ±58 V short-circuit proof CAN/LIN bus pins

● Battery and CAN/LIN bus pins are protected against transients in accordance with ISO 7637-3

● Supports remote flash programming via the CAN bus

● Small 6.1 mm × 11 mm HTSSOP32 package with low thermal resistance

● Pb-free; Restriction of Hazardous Substances Directive (RoHS) and dark green compliant

●CAN transceiver

● ISO 11898-2 and ISO 11898-5 compliant high-speed CAN transceiver

● Dedicated low dropout voltage regulator for the CAN bus:

● Independent of the microcontroller supply

● Significantly improves EMC performance

● Bus connections are truly floating when power is off

● SPLIT output pin for stabilizing the recessive bus level

●LIN transceivers

● 2 × LIN 2.1 compliant LIN transceivers

● Compliant with SAE J2602

● Downward compatible with LIN 2.0 and LIN 1.3

● Low slope mode for optimized EMC performance

● Integrated LIN termination diode at pin DLIN

●Power management

● Wake-up via CAN, LIN or local wake-up pins with wake-up source detection

● 2 wake-up pins:

● WAKE1 and WAKE2 inputs can be switched off to reduce current flow

● Output signal (WBIAS) to bias the wake-up pins, selectable sampling time of 16 ms or 64 ms

● Standby mode with very low standby current and full wake-up capability; V1 active to maintain supply to the microcontroller

● Sleep mode with very low sleep current and full wake-up capability

●Control and diagnostic features

● Safe and predictable behavior under all conditions

● Programmable watchdog with independent clock source:

● Window, Timeout (with optional cyclic wake-up) and Off modes supported (with automatic re-enable in the event of an interrupt)

● 16-bit Serial Peripheral Interface (SPI) for configuration, control and diagnosis

● Global enable output for controlling safety-critical hardware

● Limp home output (LIMP) for activating application-specific ‘limp home’ hardware in the event of a serious system malfunction

● Overtemperature shutdown

● Interrupt output pin; interrupts can be individually configured to signal V1/V2 undervoltage, CAN/LIN/local wake-up and cyclic and power-on interrupt events

● Bidirectional reset pin with variable power-on reset length to support a variety of microcontrollers

● Software-initiated system reset

●Voltage regulators

● Main voltage regulator V1:

● Scalable voltage regulator for the microcontroller, its peripherals and additional external transceivers

● ±2 % accuracy

● 3.3 V and 5 V versions available

● Delivers up to 250 mA and can be combined with an external PNP transistor for better heat distribution over the PCB

● Selectable current threshold at which the external PNP transistor starts to deliver current

● Undervoltage warning at 90 % of nominal output voltage and undervoltage reset at 90 % or 70 % of nominal output voltage

● Can operate at VBAT voltages down to 4.5 V (e.g. during cranking), in accordance with ISO 7637 pulse 4/4b and ISO16750-2

● Stable output under all conditions

● Voltage regulator V2 for CAN transceiver:

● Dedicated voltage regulator for on-chip high-speed CAN transceiver

● Undervoltage warning at 90 % of nominal output voltage

● Can be switched off; CAN transceiver can be supplied by V1 or by an external voltage regulator

● Can operate at VBAT voltages down to 5.5 V (e.g. during cranking) in accordance with ISO 7637, pulse 4

●## Features