UJA11325V – Automotive SBC with Buck-Boost Converter, CAN & LIN for ECU Power and Communication
The UJA11325V is a highly integrated System Basis Chip designed specifically for automotive electronic control units requiring robust power management and reliable bus communication.
This device combines a fully integrated buck-boost switched mode power supply with a high-speed CAN transceiver and LIN transceivers in a single package.
The automatic buck-boost converter operates with a single external coil, maintaining stable output voltage during battery voltage dips to prevent microcontroller reset or data loss.
The integrated CAN transceiver supports CAN FD communication at data rates up to 5 Mbit/s, ensuring compatibility with modern in-vehicle networks.
Up to two LIN transceivers are included, compliant with LIN 2.x, ISO 17987-4, and SAE J2602 standards for body electronics applications.
A built-in watchdog timer with Window and Timeout modes provides system monitoring to ensure fail-safe operation in critical automotive applications.
The advanced limp-home functionality is configurable via non-volatile memory, allowing the ECU to maintain essential functions even during microcontroller failure.
Multiple high-voltage I/O pins can be configured as high-side drivers, low-side drivers, or wake-up inputs for flexible system design.
Two battery monitoring channels with an integrated 10-bit ADC provide continuous voltage measurement and undervoltage/overvoltage detection.
Very low quiescent current in Sleep and Standby modes minimizes battery drain when the ignition is off, preserving vehicle battery life.
The device includes robust protection features: ±6 kV ESD protection on bus pins, ±40 V short-circuit proof CAN/LIN pins, and ISO 7637-3 transient protection.
An on-chip oscillator eliminates the need for external crystal components, reducing board space and BOM cost.
SPI interface provides full configuration control and real-time diagnostic feedback for system monitoring and fault detection.
The compact HTQFP48 package with low thermal resistance is suitable for space-constrained ECU designs operating in harsh under-hood environments.
This SBC serves as a common replacement part for engine control modules, transmission control units, and body control modules.
Typical applications include engine management systems, transmission controllers, battery management systems, and advanced driver-assistance systems.
By integrating power management, bus transceivers, and safety features into a single chip, the UJA11325V simplifies PCB design and improves system reliability.