General description
The UJA1069 fail-safe System Basis Chip (SBC) replaces basic discrete components which are common in every Electronic Control Unit (ECU) with a Local Interconnect Network (LIN) interface. The fail-safe SBC supports all networking applications which control various power and sensor peripherals by using LIN as a local sub-bus.

Features
General
■ Contains a full set of LIN ECU functions:
    ◆ LIN transceiver
    ◆ Voltage regulator for the microcontroller (5.0 V)
    ◆ Enhanced window watchdog with on-chip oscillator
    ◆ Serial Peripheral Interface (SPI) for the microcontroller
    ◆ ECU power management system
    ◆ Fully integrated autonomous fail-safe system
■ Designed for automotive applications:
    ◆ Supports 14 V and 42 V architectures
    ◆ Excellent ElectroMagnetic Compatibility (EMC) performance
    ◆ ±8 kV ElectroStatic Discharge (ESD) protection Human Body Model (HBM) for off-board pins
    ◆ ±4 kV ElectroStatic Discharge (ESD) protection IEC 61000-4-2 for off-board pins
    ◆ ±60 V short-circuit proof LIN-bus pin
    ◆ Battery and LIN-bus pins are protected against transients in accordance with ISO 7637-3
    ◆ Very low sleep current
■ Supports remote flash programming via the LIN-bus
■ Available in:
    ◆ Small 6.4 mm × 7.8 mm HTSSOP24 package with low thermal resistance
    ◆ Small 8 mm × 11 mm HTSSOP32 package with low thermal resistance

LIN transceiver
■ LIN 2.0 and SAE J2602 compliant LIN transceiver
■ Enhanced error signalling and reporting
■ Downward compatible with LIN 1.3 and the TJA1020

Power management
■ Smart operating modes and power management modes
■ Cyclic wake-up capability in Standby and Sleep mode
■ Local wake-up input with cyclic supply feature
■ Remote wake-up capability via the LIN-bus
■ External voltage regulators can easily be incorporated in the power supply system (flexible and fail-safe)
■ 42 V battery related high-side switch for driving external loads such as relays and wake-up switches
■ Intelligent maskable interrupt output

Fail-safe features
■ Safe and predictable behavior under all conditions
■ Programmable fail-safe coded window and time-out watchdog with on-chip oscillator, guaranteeing autonomous fail-safe system supervision
■ Fail-safe coded 16-bit SPI interface for the microcontroller
■ Global enable pin for the control of safety-critical hardware
■ Detection and detailed reporting of failures:
    ◆ On-chip oscillator failure and watchdog alerts
    ◆ Battery and voltage regulator undervoltages
    ◆ LIN-bus failures (short-circuits)
    ◆ TXDL and RXDL clamping situations and short-circuits
    ◆ Clamped or open reset line
    ◆ SPI message errors
    ◆ Overtemperature warning
■ Rigorous error handling based on diagnostics
■ Supply failure early warning allows critical data to be stored
■ 23 bits of access-protected RAM is available e.g. for logging of cyclic problems
■ Reporting in a single SPI message; no assembly of multiple SPI frames needed
■ Limp-home output signal for activating application hardware in case system enters Fail-safe mode (e.g. for switching on warning lights)
■ Fail-safe coded activation of Software development mode and Flash mode
■ Unique SPI readable device type identification
■ Software-initiated system reset