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MCP2515
1.0
DEVICE OVERVIEW
1.2
Control Logic
The MCP2515 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:
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 multi-purpose interrupt pin (as
1.
2.
3.
The CAN module, which includes the CAN
protocol engine, masks, filters, transmit and
receive buffers.
The control logic and registers that are used to
configure the device and its operation.
The SPI protocol block.
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
An example system implementation using the device is
received.
Additionally, there are three pins available to initiate
1.1
CAN Module
immediate transmission of a message that has been
loaded into one of the three transmit registers. Use of
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
these pins is optional, as initiating message
transmissions can also be accomplished by utilizing
control registers, accessed via the SPI interface.
initiated by using control register bits via the SPI
1.3
SPI Protocol Block
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 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.
FIGURE 1-1:
CAN Module
RXCAN
BLOCK DIAGRAM
CAN
Protocol
Engine
TX and RX Buffers
Masks and Filters
SPI
Interface
Logic
CS
SCK
SI
SPI
Bus
TXCAN
Control Logic
SO
OSC1
OSC2
CLKOUT
Timing
Generation
INT
RX0BF
RX1BF
TX0RTS
? 2003-2012 Microchip Technology Inc.
Control
and
Interrupt
Registers
TX1RTS
TX2RTS
RESET
DS21801G-page 3
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相关代理商/技术参数
MCP2515-E
制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Stand-Alone CAN Controller with SPI Interface
MCP2515-E/ML
制造商:Microchip Technology Inc 功能描述:
MCP2515-E/P
功能描述:网络控制器与处理器 IC W/ SPI Inter 125dC RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray
MCP2515-E/SO
功能描述:网络控制器与处理器 IC W/ SPI Inter 125dC RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray
MCP2515-E/SORB4
制造商:Microchip Technology Inc 功能描述:
MCP2515-E/ST
功能描述:网络控制器与处理器 IC W/ SPI Inter 125dC RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray
MCP2515-I
制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Stand-Alone CAN Controller with SPI Interface
MCP2515-I/ML
制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Stand-Alone CAN Controller with SPI Interface