Overview
The UJA1078ATW/5V0/WD 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 combines the functionality of a high-speed CAN transceiver, two LIN transceivers, two voltage regulators, and an advanced watchdog in a single chip. It is designed to support networking applications in automotive systems, particularly for controlling power and sensor peripherals. The UJA1078A SBC replaces basic discrete components commonly found in Electronic Control Units (ECUs), enhancing system reliability and reducing component count.
Key Specifications
| Specification | Value |
|---|---|
| Manufacturer | NXP USA Inc. |
| Part Number | UJA1078ATW/5V0/WD |
| 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 | 250 mA, 5 V (extendable with external PNP transistor) |
| Standby Current | Very low standby current |
| Watchdog | Programmable with independent clock source |
| Operating Temperature | -40°C to 150°C |
| Compliance Standards | ISO 11898-2, ISO 11898-5, LIN 2.1, LIN 2.0, SAE J2602 |
Key Features
- High-speed CAN Transceiver: Inter-operable and downward compatible with CAN transceiver TJA1042, 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.
- Voltage Regulators: 250 mA voltage regulator for supplying a microcontroller, extendable with external PNP transistor for increased current capability.
- Advanced Watchdog: Programmable watchdog with independent clock source, supporting Window, Timeout (with optional cyclic wake-up), and Off modes.
- Low Power Modes: Standby mode with very low standby current and full wake-up capability; Sleep mode with very low sleep current and full wake-up capability.
- Control and Diagnostic Features: 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.
- Overtemperature Shutdown and Undervoltage Warning: Ensures safe and predictable behavior under all conditions.
Applications
The UJA1078ATW/5V0/WD is primarily used in automotive systems for controlling power and sensor peripherals. It is suitable for various applications within the automotive sector, including:
- Electronic Control Units (ECUs)
- Automotive networking systems using CAN and LIN protocols
- Power and sensor control systems
- Safety-critical systems requiring advanced watchdog and diagnostic features
Q & A
- What is the primary function of the UJA1078ATW/5V0/WD?
The UJA1078ATW/5V0/WD is a System Basis Chip (SBC) that combines a high-speed CAN transceiver, two LIN transceivers, two voltage regulators, and an advanced watchdog in a single chip.
- What are the compliance standards for the CAN and LIN interfaces?
The CAN interface is compliant with ISO 11898-2 and ISO 11898-5 standards, while the LIN interfaces comply with LIN 2.1, LIN 2.0, and SAE J2602 standards.
- What is the voltage range for the supply voltage?
The supply voltage range is from 4.5 V to 28 V.
- What are the key features of the watchdog in the UJA1078ATW/5V0/WD?
The watchdog is programmable with an independent clock source and supports Window, Timeout (with optional cyclic wake-up), and Off modes.
- How does the UJA1078ATW/5V0/WD manage power consumption in standby and sleep modes?
The chip features very low standby and sleep currents, with full wake-up capability in both modes.
- What diagnostic features are available on the UJA1078ATW/5V0/WD?
The chip includes a 16-bit Serial Peripheral Interface (SPI) for configuration, control, and diagnosis, as well as global enable output and limp home output.
- What is the purpose 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.
- Can the CAN transceiver be supplied by an external voltage regulator?
Yes, the CAN transceiver can be supplied by either the internal voltage regulator (V1) or an external voltage regulator.
- What are the typical applications for the UJA1078ATW/5V0/WD in the automotive sector?
It is used in Electronic Control Units (ECUs), automotive networking systems using CAN and LIN protocols, power and sensor control systems, and safety-critical systems.
- How does the UJA1078ATW/5V0/WD handle overtemperature conditions?
The chip features an overtemperature shutdown mechanism to ensure safe and predictable behavior under all conditions.
