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UJA1065TW: High-speed CAN/LIN fail-safe system basis chip

The UJA1065 fail-safe System Basis Chip (SBC) replaces basic discrete components that are common in every Electronic Control Unit (ECU) with a Controller Area Network (CAN) and a Local Interconnect Network (LIN) 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 and LIN as a local sub-bus. The fail-safe SBC contains the following integrated devices:

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:

The UJA1065 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 full monitoring and a software-driven fall-back operation.

The UJA1065 is designed for 14 V single power supply architectures and for 14 V and 42 V dual power supply architectures.

UJA1065TW: Product Block Diagram

sot549-1_3d

2.1 General

• Contains a full set of CAN and LIN ECU functions: CAN transceiver and LIN 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 ±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 CAN/LIN-bus pins Battery and CAN/LIN-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 6.1 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 from 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 LIN transceiver

• LIN 2.0 compliant LIN transceiver
• Enhanced error signalling and reporting
• Downward compatible with LIN 1.3 and the TJA1020

2.4 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 CAN-bus and 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

2.5 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 and LIN-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 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

Data Sheets (1)

Package Information (1)

Ordering Information

Package Information

Product ID	Package Description	Outline Version	Reflow/Wave Soldering	Packing	Product Status	Part NumberOrdering code(12NC)	Marking	Chemical Content	RoHS / Pb Free / RHF	LeadFree Conversion Date	MSL	MSL LF
UJA1065TW/3V3/C/T		SOT549-1		Reel 13" Q1/T1 in Drypack	Active	UJA1065TW/3V3/C/T, (9352 888 67518)	Standard Marking	UJA1065TW/3V3/C/T		Always Pb-free	3	3
				Tube in Drypack	Active	UJA1065TW/3V3:512 (9352 888 67512)	Standard Marking	UJA1065TW/3V3/C/T		Always Pb-free	3	3
UJA1065TW/5V0/C/T		SOT549-1		Reel 13" Q1/T1 in Drypack	Active	UJA1065TW/5V0/C/T, (9352 888 68518)	Standard Marking	UJA1065TW/5V0/C/T		Always Pb-free	3	3
				Tube in Drypack	Active	UJA1065TW/5V0/512 (9352 888 68512)	Standard Marking	UJA1065TW/5V0/C/T		Always Pb-free	3	3