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MCP2515-I/ST

CAN controller, SPI interface, SOIC-18

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Manufacturer Part：

MCP2515-I/ST

Package：

SOIC-18 (11.53 x 7.50 x 2.65 mm)

Description

MCP2515-I/ST Overview

The MCP2515-I/ST is a stand-alone CAN 2.0B controller from Microchip communicating via SPI interface, with 3 transmit buffers and 2 receive buffers, in a TSSOP-20 package, widely used in automotive and industrial CAN bus systems.

Key Features

CAN 2.0B compliant
SPI interface (10MHz)
3 transmit buffers
2 receive buffers
6 filters + 2 masks
Supply voltage: 2.7V-5.5V
Maximum clock: 40MHz

Product Introduction:MCP2515-I/ST Product Introduction

The MCP2515-I/ST is a stand-alone CAN (Controller Area Network) controller with SPI interface from Microchip Technology in a 20-pin TSSOP package. It implements CAN specification version 2.0B, supporting standard and extended data and remote frames at data rates up to 1 Mbps. The device features three transmit buffers with prioritization and abort capability, two receive buffers with prioritized message storage, six 29-bit acceptance filters, and two 29-bit acceptance masks for flexible message filtering. The high-speed 10 MHz SPI interface connects to any microcontroller, and the device is AEC-Q100 qualified for automotive applications. Operating from 2.7 V to 5.5 V, it is pin-compatible with the earlier MCP2510 with enhanced features.

Working Principle:MCP2515-I/ST Working Principle

The MCP2515-I/ST contains three main functional blocks: the CAN protocol engine, the message filtering and buffer management logic, and the SPI interface module. The CAN protocol engine handles bit timing, bit stuffing, CRC generation/checking, error management, and frame transmission/reception according to CAN 2.0B specifications. When the host MCU wants to transmit a message, it writes the identifier, data length, and data bytes into one of the three transmit buffers via the SPI interface, then sets the corresponding transmit request bit. The CAN engine selects the highest-priority buffer and transmits the frame on the bus. For reception, incoming messages are checked against the acceptance filters and masks; matching messages are stored in one of the two receive buffers. The first two data bytes can also be filtered, enabling protocol-specific message discrimination. When a valid message is received, the interrupt pin (INT) asserts to notify the host MCU. The one-shot mode ensures a message is only transmitted once per request, useful for time-triggered CAN protocols. The CLKOUT pin provides a programmable clock output derived from the oscillator for system use.

Pin Description:MCP2515-I/ST Pin Definition and Functions

Pin	Name	Description
1	TXCAN	CAN transmit output; connects to CAN bus transceiver TXD input
2	RXCAN	CAN receive input; connects to CAN bus transceiver RXD output
3	CLKOUT/SOF	Clock output with programmable prescaler / Start-of-frame signal output
4	TX0RTS	Transmit buffer 0 request-to-send; active low, can be used as general-purpose input
5	TX1RTS	Transmit buffer 1 request-to-send; active low input
6	TX2RTS	Transmit buffer 2 request-to-send; active low input
7	OSC2	Oscillator output; connect crystal or ceramic resonator
8	OSC1	Oscillator input; connect crystal or external clock source
9	VSS	Ground
10	RX1BF	Receive buffer 1 full flag; active low, can be used as general-purpose output
11	RX0BF	Receive buffer 0 full flag; active low output
12	INT	Interrupt output; active low, alerts MCU to received messages or errors
13	SCK	SPI clock input; up to 10 MHz
14	SI	SPI data input (MOSI); data from MCU to MCP2515
15	CS	SPI chip select; active low, selects device for SPI communication
16	SO	SPI data output (MISO); data from MCP2515 to MCU
17	VDD	Power supply (2.7 V to 5.5 V)
18-20	NC	No connect

Application Scenarios:In which products and applications isMCP2515-I/ST used

Automotive CAN Networks: Adding CAN bus capability to microcontrollers without integrated CAN peripherals
Industrial Automation: CAN-based sensor and actuator networks in factory floor equipment
Electric Vehicle BMS: Battery management system communication over CAN bus between cell monitoring ICs
Agricultural Machinery: ISOBUS and proprietary CAN communication in tractors and implements
Medical Device Networking: CAN bus data acquisition in hospital and clinical environments

Alternative Models:What chips are recommended as replacements for MCP2515-I/ST

Model	Manufacturer	Interface	CAN Version	Rate	Package
MCP2515T-I/ST	Microchip	SPI	2.0B	1 Mbps	TSSOP-20
MCP2518FD	Microchip	SPI	CAN FD	8 Mbps	TSSOP-20/VQFN-24
SJA1000	NXP	Parallel	2.0B	1 Mbps	SOIC-28
TJA1050	NXP	N/A	N/A	1 Mbps	SOIC-8
TCAN4550	Texas Instruments	SPI	CAN FD	5 Mbps	WQFN-24

MCP2515-I/ST is a standalone CAN 2.0B controller with SPI interface from Microchip in TSSOP-20. The MCP2515T-I/ST is the tape-and-reel version. MCP25625 integrates the CAN transceiver for a single-chip solution. For newer designs, MCP2517FD supports CAN FD (Flexible Data-rate) up to 8Mbps in the same TSSOP-20. The SJA1000 from NXP is the classic standalone CAN controller alternative in DIP-28 for legacy designs.