Microchip ATA663254-GAQW-VAO: A CAN System Basis Chip for Automotive Networking Applications

The evolution of modern vehicles into complex, software-defined systems has placed unprecedented demands on in-vehicle networking. At the heart of this communication infrastructure lies the Controller Area Network (CAN), a robust and widely adopted protocol. To effectively interface a microcontroller with the physical CAN layer, a specialized component is required: the System Basis Chip (SBC). The Microchip ATA663254-GAQW-VAO represents a highly integrated solution designed to meet the stringent requirements of automotive networking applications, combining a CAN transceiver, voltage regulators, and supervision functions into a single, compact package.

This SBC is engineered to serve as the central power and communication hub for electronic control units (ECUs) in automotive environments. Its core is a fully compliant CAN FD (Flexible Data-Rate) transceiver, supporting data rates up to 5 Mbps. This capability is crucial for supporting next-generation automotive networks that require higher bandwidth for advanced driver-assistance systems (ADAS), infotainment, and body control modules. The transceiver features excellent electromagnetic compatibility (EMC) and electrostatic discharge (ESD) protection, exceeding the requirements of ISO 11898-2, which ensures reliable data transmission in the electrically noisy environment of a vehicle.

Beyond communication, the ATA663254 integrates multiple linear voltage regulators. It includes one 150 mA low-dropout (LDO) regulator for powering the microcontroller and a second 80 mA LDO for powering external sensors or other peripherals. This integration significantly reduces the component count on the PCB, saving valuable space and lowering the overall system cost and complexity. Furthermore, the device incorporates a watchdog with a window mode and a fail-safe output for monitoring the microcontroller's activity, enhancing the system's functional safety—a critical aspect for automotive designs aiming to comply with standards like ISO 26262.

The device is designed for robust operation in harsh automotive conditions, supporting a wide supply voltage range from 5.5 V to 28 V and tolerating transient voltages up to 40 V. It also features comprehensive protection mechanisms, including over-temperature and short-circuit protection on all outputs, ensuring long-term reliability. Packaged in a VQFN-32, the ATA663254-GAQW-VAO is optimized for space-constrained applications and is qualified for AEC-Q100 Grade 1 (-40°C to +125°C), making it suitable for use throughout the vehicle cabin and powertrain.

ICGOO In summary, the Microchip ATA663254-GAQW-VAO is a highly integrated and robust System Basis Chip that provides a complete local power supply and CAN FD communication interface for automotive ECUs. Its combination of communication capabilities, power management, and safety features makes it an ideal foundational component for developing reliable and efficient automotive networking systems, from body control and lighting to more advanced ADAS domains.

Keywords: CAN FD Transceiver, System Basis Chip (SBC), Automotive Networking, Voltage Regulators, AEC-Q100.