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UJA1076ATW/5V0WD,1 SOT-549-1
  • UJA1076ATW/5V0WD,1
  • UJA1076ATW/5V0WD,1 0
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System Basis Chip, CAN Protocol, ISO 11898-2/5 Standard, 4.5V to 28V Supply, HTSSOP-32

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NXP Semiconductor
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Interface ICs
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UJA1076ATW/5V0WD,1 Product Details

The UJA1076A core System Basis Chip (SBC) replaces the basic discrete components commonly found in Electronic Control Units (ECU) with a high-speed Controller Area Network (CAN).

The UJA1076A supports the networking applications used to control power and sensor peripherals by using a high-speed CAN as the main network interface.

The core SBC contains the following integrated devices:

  • High-speed CAN transceiver, inter-operable and downward compatible with CAN transceiver TJA1042, and compatible with the ISO 11898-2 and ISO 11898-5 standards
  • Advanced independent watchdog (UJA1076A/xx/WD versions)
  • 250 mA voltage regulator for supplying a microcontroller; extendable with external PNP transistor for increased current capability and dissipation distribution
  • Separate voltage regulator for supplying the on-board CAN transceiver
  • 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 UJA1076A is designed to be used in combination with a microcontroller that incorporates a CAN controller. The SBC ensures that the microcontroller always starts up in a controlled manner.


  • Contains a full set of CAN ECU functions:
    • CAN 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
    • Separate voltage regulator for the CAN transceiver (5 V)
    • 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 CAN bus pins and the wake-up pins
    • ±6 kV ElectroStatic Discharge (ESD) protection IEC 61000-4-2 on the CAN bus pins and the wake-up pins
    • ±58 V short-circuit proof CAN bus pins
    • Battery and CAN bus pins are protected against transients in accordance with ISO 7637-3
  • Supports remote flash programming via the CAN bus
  • Small 6.1 mm × 11 mm HTSSOP32 package with low thermal resistance
  • Pb-free; Restriction of Hazardous Substances Directive (RoHS) and dark green compliant
CAN transceiver

  • ISO 11898-2 and ISO 11898-5 compliant high-speed CAN transceiver
  • Dedicated low dropout voltage regulator for the CAN bus:
    • Independent of the microcontroller supply
    • Significantly improves EMC performance
  • Bus connections are truly floating when power is off
  • SPLIT output pin for stabilizing the recessive bus level
Power management

  • Wake-up via CAN 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/V2 undervoltage, CAN/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 regulators

  • Main 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 ISO 16750-2
    • Stable output under all conditions
  • Voltage regulator V2 for CAN transceiver:
    • Dedicated voltage regulator for on-chip high-speed CAN transceiver
    • Undervoltage warning at 90 % of nominal output voltage
    • Can be switched off; CAN transceiver can be supplied by V1 or by an external voltage regulator
    • Can operate at VBAT voltages down to 5.5 V (e.g. during cranking) in accordance with ISO 7637, pulse 4
    • Stable output under all conditions

Technical Parameters

Type High Speed CAN Transceiver Packaging Reel
Operating Supply Voltage 4.5 V to 28 V Mounting Style SMD/SMT
Supply Current 97 uA Factory Pack Quantity 2000
Package / Case SOT-549-1

UJA1076ATW/5V0WD,1 Documents

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