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System Basis Chip Automotive 32-Pin HTSSOP EP Tube

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UJA1066TW/5V0/T General Description

The UJA1066 fail-safe System Basis Chip (SBC) replaces basic discrete components which are common in every Electronic Control Unit (ECU) with a Controller Area Network (CAN) interface. The fail-safe SBC supports all networking applications that control various power and sensor peripherals by using high-speed CAN as the main network interface. The fail-safe SBC contains the following integrated devices:High-speed CAN transceiver, interoperable and downward compatible with CAN transceiver TJA1041 and TJA1041A, and compatible with the ISO 11898-2 standard and the ISO 11898-5 standard (in preparation)Advanced independent watchdogDedicated voltage regulators for microcontroller and CAN transceiverSerial peripheral interface (full duplex)Local wake-up input portInhibit/limp-home output portIn 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 conceptSafe and controlled system start-up behaviorAdvanced fail-safe system behavior that prevents any conceivable deadlockDetailed status reporting on system and subsystem levelsThe UJA1066 is designed to be used in combination with a microcontroller that incorporates a CAN 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 microcontroller functionality for as long as possible to provide a full monitoring and software-driven fallback operation.The UJA1066 is designed for 14 V single power supply architectures and for 14 V and 42 V dual power supply architectures.

NXP Semiconductor Inventory

Key Features

  • 2.1 General
  • Contains a full set of CAN ECU functions:
  • CAN transceiver
  • Voltage regulator for the microcontroller (3.3 V or 5.0 V)
  • Separate voltage regulator for the CAN transceiver (5 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
  • Battery and CAN-bus pins are protected against transients in accordance with ISO 7637-3
  • Very low sleep current
  • Supports remote flash programming via the CAN-bus
  • Small 8 mm × 11 mm HTSSOP32 package with low thermal resistance
  • 2.2 CAN transceiver
  • ISO 11898-2 and ISO 11898-5 compliant high-speed CAN transceiver
  • Enhanced error signalling and reporting
  • Dedicated low dropout voltage regulator for the CAN-bus:
  • Independent of the microcontroller supply
  • Guarded by CAN-bus failure management
  • Significantly improves EMC performance
  • Partial networking option with global wake-up feature; allows selective CAN-bus communication without waking up sleeping nodes
  • Bus connections are truly floating when power is off
  • SPLIT output pin for stabilizing the recessive bus level
  • 2.3 Power management
  • Smart operating modes and power management modes
  • Cyclic wake-up capability in Standby and Sleep modes
  • Local wake-up input with cyclic supply feature
  • Remote wake-up capability via the CAN-bus
  • External voltage regulators can easily be incorporated into 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
  • 2.4 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
  • CAN-bus failures (short circuits and open-circuit bus wires)
  • TXD and RXD clamping situations and short circuits
  • Clamped or open reset line
  • SPI message errors
  • Overtemperature warning
  • ECU ground shift (two selectable thresholds)
  • Rigorous error handling based on diagnostics
  • Supply failure early warning allows critical data to be stored
  • 23 bits of access-protected RAM available (e.g. for logging 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
  • One SPI readable device type identification
  • Software-initiated system reset
NXP Semiconductor Original Stock
NXP Semiconductor Inventory


Number of pins 32 Package Style HTSSOP
Recommended Version 150mA V<sub>ESD</sub> HBM on bus pins (+/- kV) 8
T<sub>vj</sub> [max] -40~150 Over-temperature detection Yes
Security Status COMPANY PUBLIC SPLIT pin Yes
INH / Wake Pin Yes Min High Input Levels (V) 0.7 x Vv1
CAN channels 1 LIN channels 0
Description High-speed CAN fail-safe system basis chip FlexRay Channels 0
Voltage on bus pins [min] -60 countdown timer Yes
Voltage on bus pins [max] 60 TX Dominant Time out Yes
Low power modes Standby Mode; Sleep Mode V<sub>ESD</sub> IEC61000-4-2 (kV) 4
stop-watch mode Standby Mode; Sleep Mode Product category SBC; High-Speed CAN; Fail-safe SBC
Supply voltage [min] (V) 5.5 Supply voltage [max] (V) 33
Application Yes Under-voltage detection Yes
Supported standards ISO-11898-2; ISO-11898-5 Data rate (Mbps) 18
Data rate [min] (kb/s) 18 RF driver supply [max] (V) 33
Data rate [max] (kb/s) 1000 RF driver supply [min] (V) 5.5
VIO option available No


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UJA1066TW/5V0/T Datasheet PDF

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