UJA1069

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. The fail-safe SBC contains the following integrated devices:

• LIN transceiver compliant with LIN 2.0 and SAE J2602, and compatible with LIN 1.3
• Advanced independant watchdog
• Dedicated voltage regulator for microcontroller
• Serial peripheral interface (full duplex)
• Local wake-up input port
• Inhibit/limp-home output port

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

• Advanced low-power concept
• Safe and controlled system start-up behavior
• Advanced fail-safe system behavior that prevents any conceivable deadlock
• Detailed status reporting on system and sub-system levels

The UJA1069 is designed to be used in combination with a microcontroller and a LIN controller. The fail-safe SBC ensures that the microcontroller is always started up in a defined manner. In failure situations the fail-safe SBC will maintain the microcontroller function for as long as possible, to provide full monitoring and software driven fall-back operation.

The UJA1069 is designed for 14 V single power supply architectures and for 14 V and 42 V dual power supply architectures.

Features

General

• Contains a full set of LIN ECU functions:
  • LIN transceiver
  • Voltage regulator for the microcontroller (3.0 V, 3.3 V or 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 x 7.8 mm HTSSOP24 package with low thermal resistance
  • Small 8 mm x 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)
  • TXD and RXD 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

Products/packages

Pricing/ordering/availability

Applications

Related applications
Body controller module

Design support

Support Documents

75015751; Fail-Safe System Basis Chips UJA106x (2006-09-01)

75016161; NXP Automotive networking solutions (2007-09-01)

75015312; Philips Fail-Safe System Basis Chips (2005-09-01)

75015741; The vital link in the interconnected car (2006-09-01)

75014894; UJA106x Fail-Safe System Basis Chips (2005-04-01)

Parametrics/similar products

Similar products
UJA1069 links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category.

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