UJA1075ATW/5V0/WD

The UJA1075A 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) and a Local Interconnect Network (LIN) interface. The UJA1075A supports the networking applications used to control power and sensor peripherals by using a high-speed CAN as the main network interface and the LIN interface as a local sub-bus. 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 - LIN transceiver compliant with LIN 2.1, LIN 2.0 and SAE J2602, and compatible with LIN 1.3 - Advanced independent watchdog (UJA1075A/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 UJA1075A 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.

Key features

• Contains a full set of CAN and LIN ECU functions:
• CAN transceiver and 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
• 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/LIN bus pins and the wake-up pins
• ±6 kV ElectroStatic Discharge protection IEC 61000-4-2 on the CAN/LIN bus pins and the wake-up pins
• ±58 V short-circuit proof CAN/LIN bus pins
• Battery and CAN/LIN 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
• 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
• 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
• Wake-up via CAN, LIN 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
• 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/LIN/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
• 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 V_BAT 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