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.<\/p>\n
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 […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13,20],"tags":[],"chip_brand":[134],"class_list":["post-8038","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-interface-ics","chip_brand-microchip"],"acf":{"brief_explanation":"CAN controller, SPI interface, SOIC-18","date_code":"","package_case":"SOIC-18 (11.53 x 7.50 x 2.65 mm)","in_stock":5950,"datasheet":"https:\/\/ww1.microchip.com\/downloads\/en\/DeviceDoc\/MCP2515-Stand-Alone-CAN-Controller-with-SPI-20001801J.pdf","price":"$1.45 @ 1ku","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":"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":"
| Pin<\/th> | Name<\/th> | Description<\/th><\/tr> | ||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1<\/td> | TXCAN<\/td> | CAN transmit output; connects to CAN bus transceiver TXD input<\/td><\/tr> | ||||||||||||||||||||||||||||||||||||
| 2<\/td> | RXCAN<\/td> | CAN receive input; connects to CAN bus transceiver RXD output<\/td><\/tr> | ||||||||||||||||||||||||||||||||||||
| 3<\/td> | CLKOUT\/SOF<\/td> | Clock output with programmable prescaler \/ Start-of-frame signal output<\/td><\/tr> | ||||||||||||||||||||||||||||||||||||
| 4<\/td> | TX0RTS<\/td> | Transmit buffer 0 request-to-send; active low, can be used as general-purpose input<\/td><\/tr> | ||||||||||||||||||||||||||||||||||||
| 5<\/td> | TX1RTS<\/td> | Transmit buffer 1 request-to-send; active low input<\/td><\/tr> | ||||||||||||||||||||||||||||||||||||
| 6<\/td> | TX2RTS<\/td> | Transmit buffer 2 request-to-send; active low input<\/td><\/tr> | ||||||||||||||||||||||||||||||||||||
| 7<\/td> | OSC2<\/td> | Oscillator output; connect crystal or ceramic resonator<\/td><\/tr> | ||||||||||||||||||||||||||||||||||||
| 8<\/td> | OSC1<\/td> | Oscillator input; connect crystal or external clock source<\/td><\/tr> | ||||||||||||||||||||||||||||||||||||
| 9<\/td> | VSS<\/td> | Ground<\/td><\/tr> | ||||||||||||||||||||||||||||||||||||
| 10<\/td> | RX1BF<\/td> | Receive buffer 1 full flag; active low, can be used as general-purpose output<\/td><\/tr> | ||||||||||||||||||||||||||||||||||||
| 11<\/td> | RX0BF<\/td> | Receive buffer 0 full flag; active low output<\/td><\/tr> | ||||||||||||||||||||||||||||||||||||
| 12<\/td> | INT<\/td> | Interrupt output; active low, alerts MCU to received messages or errors<\/td><\/tr> | ||||||||||||||||||||||||||||||||||||
| 13<\/td> | SCK<\/td> | SPI clock input; up to 10 MHz<\/td><\/tr> | ||||||||||||||||||||||||||||||||||||
| 14<\/td> | SI<\/td> | SPI data input (MOSI); data from MCU to MCP2515<\/td><\/tr> | ||||||||||||||||||||||||||||||||||||
| 15<\/td> | CS<\/td> | SPI chip select; active low, selects device for SPI communication<\/td><\/tr> | ||||||||||||||||||||||||||||||||||||
| 16<\/td> | SO<\/td> | SPI data output (MISO); data from MCP2515 to MCU<\/td><\/tr> | ||||||||||||||||||||||||||||||||||||
| 17<\/td> | VDD<\/td> | Power supply (2.7 V to 5.5 V)<\/td><\/tr> | ||||||||||||||||||||||||||||||||||||
| 18-20<\/td> | NC<\/td> | No connect<\/td><\/tr><\/table>","application_scenarios":"
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