NXP PCA82C250TYM CAN Bus Transceiver: Datasheet, Application Circuit, and Key Features

The NXP PCA82C250TYM is a cornerstone component in Controller Area Network (CAN) systems, serving as the critical interface between a CAN protocol controller and the physical bus. This transceiver is designed to provide differential transmit and receive capability to a microprocessor with a CAN controller, making it a fundamental building block in automotive, industrial, and automation applications where robust serial communication is essential.

Key Features

The PCA82C250TYM stands out due to its robust feature set tailored for harsh electrical environments. Its key features include:

High-Speed Capability: Supports data rates up to 1 Megabit per second (Mbps), making it suitable for real-time control networks.

Excellent EMC Performance: Features radio-frequency immunity and low electromagnetic emission, which is crucial for passing stringent automotive EMC tests.

Wide Common-Mode Range: With a ±36V bus fault tolerance and a -12V to +12V common-mode voltage range, it can handle the significant ground potential differences and noise typically encountered in vehicle electrical systems.

Thermal Protection: An integrated thermal protection mechanism shuts down the driver if the junction temperature exceeds a safe limit, preventing damage from short circuits.

Low Power Management: Includes a standby mode with a low-current supply (typ. 5 µA), which is ideal for power-sensitive applications like battery-operated nodes.

Short-Circuit Protection: The driver outputs are protected against short circuits to both battery voltage and ground.

Application Circuit

A typical application circuit for the PCA82C250TYM is straightforward. The CAN controller's transmit (TXD) and receive (RXD) pins are connected directly to the transceiver's corresponding pins. A common-mode choke and split termination resistors are often used on the CANH and CANL lines to further enhance EMC performance. A small capacitor (typically 4.7nF) is placed across the bus lines to filter high-frequency noise. The transceiver's slope control pin (Rs) allows for adjusting the slew rate of the output signals; connecting a resistor to ground enables slope control for reduced RFI, while driving this pin directly to VDD forces high-speed mode.

Datasheet Overview

The official datasheet is the ultimate source of information for design-in. It provides all necessary details for successful implementation, including:

Absolute maximum ratings and recommended operating conditions.

Detailed electrical characteristics (DC and AC parameters).

Application information and internal block diagrams.

Package outlines (SO8) for PCB layout.

Typical performance characteristics graphs.

ICGOODFIND: The NXP PCA82C250TYM remains a highly reliable and industry-standard CAN transceiver. Its proven robustness, excellent fault protection, and superior EMC performance make it a default choice for designers building reliable networks in electrically challenging environments, from vehicle powertrains to industrial machinery.

Keywords: CAN Bus Transceiver, NXP PCA82C250TYM, High-Speed Communication, EMC Performance, Fault Protection.