SJA1000 Stand-Alone CAN Controller

Overview

The SJA1000 is a stand-alone Controller Area Network (CAN) controller developed for automotive and general industrial applications. It is designed to handle the communication between microcontrollers and CAN networks, providing a flexible and efficient solution for CAN-based systems. The SJA1000 supports both BasicCAN and PeliCAN modes, making it suitable for a wide range of applications, from simple to complex CAN implementations.

The device interfaces seamlessly with various microcontrollers and CAN transceiver circuits, enabling robust communication in harsh environments. Its advanced features, such as automatic bit-rate detection and comprehensive error handling, make it a preferred choice for developers requiring reliable CAN communication.

Features

• Dual CAN Modes: Supports BasicCAN (legacy mode) and PeliCAN (extended mode) for backward compatibility and advanced functionality.
• Wide Voltage Range: Operates at a supply voltage of 4.5V to 5.5V, suitable for industrial and automotive environments.
• High-Speed Communication: Supports CAN 2.0A and 2.0B protocols with bit rates up to 1 Mbit/s.
• Advanced Error Handling: Includes features like error detection, error confinement, and automatic retransmission of corrupted messages.
• Flexible Interface: Compatible with most microcontrollers via parallel or serial interfaces.
• Programmable Features: Configurable acceptance filters, transmit priority settings, and wake-up functionality.
• Low Power Consumption: Features power-down and sleep modes for energy-efficient operation.
• Temperature Range: Operates reliably across an industrial temperature range of -40°C to +125°C.

Applications

The SJA1000 is widely used in applications requiring robust and reliable CAN communication. Key application areas include:

• Automotive Systems: Engine control units (ECUs), transmission systems, and body electronics.
• Industrial Automation: PLCs, sensors, and actuators in manufacturing environments.
• Medical Devices: Diagnostic equipment and patient monitoring systems.
• Embedded Systems: IoT devices, robotics, and control systems.
• Telematics: Fleet management and vehicle tracking systems.

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (V_DD): -0.5V to +7.0V
• Input Voltage (V_IN): -0.5V to V_DD +0.5V
• Operating Temperature Range: -40°C to +125°C
• Storage Temperature Range: -65°C to +150°C

Recommended Operating Conditions

• Supply Voltage (V_DD): 4.5V to 5.5V
• Input High Voltage (V_IH): 2.0V to V_DD
• Input Low Voltage (V_IL): -0.5V to 0.8V
• Output High Voltage (V_OH): 2.4V (min) at I_OH = -3.2mA
• Output Low Voltage (V_OL): 0.4V (max) at I_OL = 3.2mA

Power Consumption

• Active Mode: 50mA (typical) at 5V, 1 Mbit/s
• Standby Mode: 10µA (typical)

Package Information

The SJA1000 is available in multiple package options to suit different design requirements:

• SOIC-28: Small Outline Integrated Circuit, 28-pin, suitable for space-constrained applications.
• PLCC-28: Plastic Leaded Chip Carrier, 28-pin, offers robust mechanical stability.
• DIP-28: Dual In-line Package, 28-pin, ideal for prototyping and testing.

Pin Configuration

The SJA1000 features a 28-pin configuration with pins dedicated to power supply, ground, microcontroller interface, and CAN bus communication. Key pins include:

• V_DD (Pins 28, 14): Power supply (5V).
• V_SS (Pins 1, 15): Ground.
• AD0-AD7 (Pins 2-9): Multiplexed address/data bus for microcontroller interface.
• ALE (Pin 11): Address Latch Enable for demultiplexing the address/data bus.
• RD (Pin 10), WR (Pin 12): Read and write control signals.
• TX0, TX1 (Pins 16, 17): CAN transmit outputs.
• RX0, RX1 (Pins 18, 19): CAN receive inputs.
• CLKOUT (Pin 20): Clock output for synchronization.
• INT (Pin 13): Interrupt output to the microcontroller.

Functional Description

BasicCAN Mode

In BasicCAN mode, the SJA1000 operates as a simple CAN controller with limited functionality. It supports CAN 2.0A (11-bit identifier) and is ideal for legacy systems requiring minimal configuration.

PeliCAN Mode

PeliCAN mode extends the functionality of the SJA1000 with advanced features such as:

• Support for CAN 2.0B (29-bit identifier).
• Enhanced error detection and confinement.
• Programmable acceptance filters for message filtering.
• Automatic bit-rate detection for flexible baud rate configuration.

Programming Examples

The SJA1000 can be programmed for various operations, including initialization, message transmission, and reception. Below are brief examples:

• Initialization: Configure the baud rate, acceptance filters, and interrupt settings.
• Transmission: Load the message buffer, set the identifier, and initiate transmission.
• Reception: Poll or use interrupts to handle incoming messages and process data.

Conclusion

The SJA1000 is a versatile and reliable CAN controller suitable for a wide range of applications. Its dual-mode operation, robust electrical characteristics, and flexible package options make it an excellent choice for designers seeking a high-performance CAN solution. Whether used in automotive, industrial, or embedded systems, the SJA1000 delivers efficient and dependable communication.