Overview
The UJA1078ATW/5V0/1J is a high-speed CAN (Controller Area Network) and dual LIN (Local Interconnect Network) core System Basis Chip (SBC) produced by NXP USA Inc. This integrated circuit is designed to replace basic discrete components commonly found in Electronic Control Units (ECUs) within automotive systems. It integrates a high-speed CAN transceiver and two LIN transceivers, along with other essential functions such as voltage regulators and a watchdog (in certain versions). This chip is optimized for networking applications, controlling power and sensor peripherals, and ensures safe and predictable behavior under all operating conditions.
Key Specifications
| Parameter | Description |
|---|---|
| Manufacturer | NXP USA Inc. |
| Package | 32-HTSSOP (0.240", 6.10mm Width) Exposed Pad |
| Mounting Type | Surface Mount |
| Interface | CAN, LIN |
| Voltage - Supply | 4.5 V ~ 28 V |
| Voltage Regulator | 5 V (extendable with external PNP transistor) |
| Watchdog | Programmable watchdog with independent clock source (in WD versions) |
| Standby and Sleep Modes | Very low standby and sleep current with full wake-up capability |
| Operating Temperature | Compliant with ISO 7637, pulse 4; operates at VBAT voltages down to 5.5 V during cranking |
Key Features
- High-speed CAN transceiver compliant with ISO 11898-2 and ISO 11898-5 standards
- Dual LIN transceivers compliant with LIN 2.1, LIN 2.0, and SAE J2602 standards
- Integrated 250 mA voltage regulator (5 V or 3.3 V versions available)
- Programmable watchdog with window, timeout, and off modes
- 16-bit Serial Peripheral Interface (SPI) for configuration, control, and diagnosis
- Global enable output for controlling safety-critical hardware
- Limp home output for activating application-specific ‘limp home’ hardware in case of system malfunction
- Overtemperature shutdown and undervoltage warning
- Wake-up inputs with selectable sampling time (16 ms or 64 ms)
Applications
The UJA1078ATW/5V0/1J is primarily used in automotive applications, particularly in Electronic Control Units (ECUs) that require high-speed CAN and LIN networking. It is suitable for controlling power and sensor peripherals in various automotive systems.
Q & A
- What is the primary function of the UJA1078ATW/5V0/1J?
The primary function of the UJA1078ATW/5V0/1J is to integrate high-speed CAN and dual LIN transceivers along with other essential functions like voltage regulators and a watchdog, replacing basic discrete components in Electronic Control Units (ECUs).
- What are the supported network standards for the CAN and LIN interfaces?
The CAN transceiver is compliant with ISO 11898-2 and ISO 11898-5 standards, while the LIN transceivers are compliant with LIN 2.1, LIN 2.0, and SAE J2602 standards.
- What is the voltage range for the supply voltage of the UJA1078ATW/5V0/1J?
The supply voltage range is from 4.5 V to 28 V.
- Does the UJA1078ATW/5V0/1J have a built-in voltage regulator?
- What is the purpose of the watchdog in the UJA1078ATW/5V0/1J?
The watchdog is programmable and has an independent clock source, supporting window, timeout, and off modes to ensure safe and predictable system behavior.
- How does the UJA1078ATW/5V0/1J handle power-up and power-down functionality?
The chip handles power-up and power-down functionality of the ECU, including standby and sleep modes with very low current consumption and full wake-up capability.
- What is the significance of the exposed die pad in the package?
The exposed die pad at the bottom of the package allows for better heat dissipation from the SBC via the printed-circuit board.
- What are the key diagnostic features of the UJA1078ATW/5V0/1J?
The chip includes features such as overtemperature shutdown, undervoltage warning, and an interrupt output pin for diagnostic purposes.
- How does the UJA1078ATW/5V0/1J support wake-up functionality?
The chip has wake-up inputs with selectable sampling time (16 ms or 64 ms) and an output signal (WBIAS) to bias the wake-up pins.
- In what type of applications is the UJA1078ATW/5V0/1J typically used?
The UJA1078ATW/5V0/1J is typically used in automotive applications, particularly in Electronic Control Units (ECUs) that require high-speed CAN and LIN networking.
- What is the mounting type of the UJA1078ATW/5V0/1J?
The mounting type is surface mount, and the package is 32-HTSSOP with an exposed pad.
