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Description
MCP2515 Stand-Alone CAN Controllers
Title
Stand-Alone CAN Controller with SPI Interface
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Implements CAN at 1 Mb/s: to 8-byte length in the data field - Standard and extended data and remote frames
Receive Buffers, Masks and Filters: - Two receive buffers with prioritized message storage - Six 29-bit filters - Two 29-bit masks
Data Byte Filtering on the First Two Data Bytes (applies to standard data frames)Start-of-Frame (SOF) Signal is Available for Monitoring the SOF Signal: - Can be used for time slot-based protocols and/or bus diagnostics to detect early bus degradation
Interrupt Output Pin with Selectable Enables Buffer Full Output Pins Configurable as:- Interrupt output for each receive buffer - General purpose output Request-to-Send (RTS) Input Pins Individually Configurable as: - Control pins to request transmission for each
transmit buffer - General purpose inputs Low-Power CMOS Technology: - Operates from 5 mA active current (typical) 1 A standby current (typical) (Sleep mode) Temperature Ranges Supported: - Industrial (I): +85°C - Extended (E): to +125°C
DescriptionMicrochip Technology's is a stand-alone Controller Area Network (CAN) controller that implements the CAN specification, Version It is capable of transmitting and receiving both standard and extended data and remote frames. The MCP2515 has two acceptance masks and six acceptance filters that are used to filter out unwanted messages, thereby reducing the host MCU's overhead. The MCP2515 interfaces with microcontrollers (MCUs) via an industry standard Serial Peripheral Interface (SPI).
The is a stand-alone CAN controller developed to simplify applications that require interfacing with a CAN bus. A simple block diagram of the MCP2515 is shown in Figure 1-1. The device consists of three main blocks:
1. The CAN module, which includes the CAN protocol engine, masks, filters, transmit and receive buffers.
2. The control logic and registers that are used to configure the device and its operation.The CAN module handles all functions for receiving and transmitting messages on the CAN bus. Messages are transmitted by first loading the appropriate message buffer and control registers. Transmission is initiated by using control register bits via the SPI interface or by using the transmit enable pins. Status and errors can be checked by reading the appropriate registers. Any message detected on the CAN bus is checked for errors and then matched against the user-defined filters to see if it should be moved into one of the two receive buffers.
The control logic block controls the setup and operation of the MCP2515 by interfacing to the other blocks in order to pass information and control.
Interrupt pins are provided to allow greater system flexibility. There is one multipurpose interrupt pin (as well as specific interrupt pins) for each of the receive registers that can be used to indicate a valid message has been received and loaded into one of the receive buffers. Use of the specific interrupt pins is optional. The general purpose interrupt pin, as well as status registers (accessed via the SPI interface), can also be used to determine when a valid message has been received.
Additionally, there are three pins available to initiate immediate transmission of a message that has been loaded into one of the three transmit registers. Use of these pins is optional, as initiating message transmissions can also be accomplished by utilizing control registers accessed via the SPI interface.
The MCU interfaces to the device via the SPI interface. Writing to, and reading from, all registers is accomplished using standard SPI read and write commands, in addition to specialized SPI commands.
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