General description

The UJA1079 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 UJA1079 supports the networking applications used to control power and sensor peripherals by using the LIN interface as a local sub-bus.

Features and benefits

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:

◆ Excellent ElectroMagnetic Compatibility (EMC) performance

◆ ±8 kV ElectroStatic Discharge (ESD) protection Human Body Model (HBM) on the LIN bus pin and the wake pins

◆ ±6 kV ElectroStatic Discharge (ESD) protection IEC 61000-4-2 on the LIN bus pin and the wake 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; 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 pins with wake-up source detection

■ 2 wake pins:

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

◆ Output signal (WBIAS) to bias the wake 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

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