MCP2515-I/ST

Product Overview

• Category: Integrated Circuit (IC)
• Use: Controller Area Network (CAN) Bus Controller
• Characteristics: High-speed SPI Interface, Supports CAN V2.0B Protocol, 8MHz Clock Speed, 3.3V Operation
• Package: SOIC-20
• Essence: MCP2515-I/ST is a highly integrated and cost-effective CAN controller that allows microcontrollers to communicate with CAN bus networks.
• Packaging/Quantity: The MCP2515-I/ST is available in a tape and reel packaging, with 2500 units per reel.

Specifications

• Operating Voltage: 2.7V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Clock Speed: Up to 8MHz
• Interface: Serial Peripheral Interface (SPI)
• CAN Protocol Support: CAN V2.0B (29-bit identifier support)
• Transmit/Receive Buffers: 3 Transmit and 2 Receive Buffers
• Filtering/Masking Options: Programmable Mask and Filter
• Interrupt Output Pin: INT
• Standby Current: 5µA (typical)

Pin Configuration

The MCP2515-I/ST has a total of 20 pins arranged as follows:

1. VDD - Power Supply
2. VSS - Ground
3. OSC1 - Crystal Oscillator Input
4. OSC2 - Crystal Oscillator Output
5. CS - Chip Select
6. SI - Serial Data Input
7. SO - Serial Data Output
8. SCK - Serial Clock Input
9. INT - Interrupt Output
10. RX0BF - Receive Buffer 0 Full
11. RX1BF - Receive Buffer 1 Full
12. TX0RTS - Transmit Buffer 0 Request-to-Send
13. TX1RTS - Transmit Buffer 1 Request-to-Send
14. TX2RTS - Transmit Buffer 2 Request-to-Send
15. RX0BF - Receive Buffer 0 Full
16. RX1BF - Receive Buffer 1 Full
17. TX0RTS - Transmit Buffer 0 Request-to-Send
18. TX1RTS - Transmit Buffer 1 Request-to-Send
19. TX2RTS - Transmit Buffer 2 Request-to-Send
20. VREF - Voltage Reference

Functional Features

• Supports both Standard (11-bit identifier) and Extended (29-bit identifier) CAN frames.
• Three transmit buffers and two receive buffers for efficient message handling.
• Programmable mask and filter settings to selectively accept or reject incoming messages.
• Interrupt output pin for efficient event-driven processing.
• Low standby current consumption for power-sensitive applications.

Advantages and Disadvantages

Advantages

• Highly integrated and cost-effective solution for CAN bus communication.
• Supports both Standard and Extended CAN frames, providing flexibility in application design.
• Efficient message handling with multiple transmit and receive buffers.
• Programmable mask and filter options allow selective message acceptance.
• Interrupt output pin enables event-driven processing.

Disadvantages

• Limited number of transmit and receive buffers may not be sufficient for complex applications with high message traffic.
• Requires an external crystal oscillator for clock generation.

Working Principles

The MCP2515-I/ST acts as a bridge between a microcontroller and a Controller Area Network (CAN) bus network. It communicates with the microcontroller through a Serial Peripheral Interface (SPI) and handles the transmission and reception of CAN frames.

When a microcontroller wants to send a message, it writes the message data into one of the transmit buffers and requests transmission. The MCP2515-I/ST then takes care of the CAN frame formatting and transmission on the CAN bus.

On the receiving side, the MCP2515-I/ST monitors the CAN bus for incoming messages. When a message is received, it stores the data in one of the receive buffers and generates an interrupt to notify the microcontroller.

The programmable mask and filter settings allow the MCP2515-I/ST to selectively accept or reject incoming messages based on their identifiers. This enables efficient filtering of relevant messages and reduces the processing load on the microcontroller.

Detailed Application Field Plans

The MCP2515-I/ST is widely used in various applications that require communication over a Controller Area Network (CAN) bus. Some common application fields include:

1. Automotive: Used in automotive electronics for communication between different vehicle systems, such as engine control units, body control modules, and instrument clusters.
2. Industrial Automation: Enables communication between industrial devices and controllers in automation systems, facilitating real-time control and monitoring.
3. Home Automation: Allows integration and communication between different smart home devices, enabling centralized control and automation.
4. Medical Devices: Used in medical