CAN Normal/Sleep/Standby 9V/12V/15V/18V/24V/28V 32Pin HTSSOP EP Tube
Overview
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 watchdog
* Dedicated voltage regulators for microcontroller and CAN transceiver
* 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 subsystem levels
The 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.
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## 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
* ±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-bus pins
* 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
* Unique SPI readable device type identification
* Software-initiated system reset
## Features