UJA1079ATW/5V0/1J

CAN 接口集成电路 LIN core system basis chip

Overview

The UJA1079A core System Basis Chip SBC replaces the basic discrete components commonly found in Electronic Control Units ECU with a Local Interconnect Network LIN interface.

The UJA1079A supports the networking applications used to control power and sensor peripherals by using the LIN interface as a local sub-bus.

The core SBC contains the following integrated devices:

* LIN transceiver compliant with LIN 2.1, LIN 2.0 and SAE J2602, and compatible with LIN 1.3

* Advanced independent watchdog UJA1079A/xx/WD versions

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

* 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 UJA1079A is designed to be used in combination with a microcontroller. The SBC ensures that the microcontroller always starts up in a controlled manner.

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## Features

**2.1 General**

* Contains LIN ECU functions:

* LIN transceiver

* 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

* 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 LIN bus pin and the wake-up pins

* ±6 kV ElectroStatic Discharge protection IEC 61000-4-2 on the LIN bus pin and the wake-up pins

* ±58 V short-circuit proof LIN bus pin

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

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

* Pb-free; Restriction of Hazardous Substances Directive RoHS and dark green compliant

**LIN transceiver**

* LIN 2.1 compliant LIN transceiver

* 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 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 undervoltage, 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 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

## Features