MCP2551：高速CAN收发器，适用于12V和24V系统

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"MCP2551是一款由Microchip Technology Inc.生产的高速CAN（Controller Area Network）总线收发器，适用于12V和24V系统，支持高达1Mb/s的操作速率，符合ISO-11898标准的物理层要求。这款设备具有多种保护功能，包括对外部控制斜率以降低RFI（Radio Frequency Interference）辐射、检测TXD输入端的接地故障、电源复位和电压下降保护等。在电源未供电或出现电源下降事件时，它不会干扰CAN总线的正常运行。此外，MCP2551还具备低电流待机操作、防止短路损坏的保护机制，以及对正负电池电压异常的防护。该器件可以承受高电压瞬变，并具有自动热关断保护功能，最多可连接112个节点。由于其差分总线的实现，MCP2551具有很高的噪声免疫力，工作温度范围覆盖工业级(-40°C至+85°C)和扩展级(-40°C至+125°C)。MCP2551采用PDIP/SOIC封装，内部结构包括热关断、电源复位、参考电压、接收器、驱动器控制等模块。" MCP2551的主要特性包括： 1. **高速操作**：支持1Mb/s的数据传输速度，满足高速CAN通信需求。 2. **ISO-11898标准**：遵循国际标准，确保与多种CAN设备的兼容性。 3. **电压范围广泛**：适用于12V和24V系统，适应不同的应用环境。 4. **RFI抑制**：通过外部控制斜率降低电磁干扰，提高系统稳定性。 5. **接地故障检测**：能检测TXD输入端的永久主导状态，帮助识别和处理故障。 6. **电源保护**：具备电源复位和电压下降保护功能，确保在电源不稳定时仍能稳定工作。 7. **无干扰工作**：在无电源或电源下降的情况下，不会对CAN总线造成干扰。 8. **低功耗待机**：在待机模式下，电流消耗较低，节省能源。 9. **短路保护**：能够保护设备免受正负电池电压短路条件的损害。 10. **高电压瞬态防护**：设计有防护机制，能抵御高电压瞬变的影响。 11. **热关断保护**：当设备过热时，会自动关闭，防止器件损坏。 12. **高噪声免疫力**：采用差分总线设计，提高在嘈杂环境中的数据传输可靠性。 13. **节点数量**：可连接多达112个节点，满足大规模网络需求。 14. **温度范围**：提供两种工作温度范围，满足不同应用场合的需求。 MCP2551的封装形式为PDIP/SOIC，内部结构图显示了其主要组成部分，包括电源（VDD和VSS）、CANH和CANL接口、TXD和RXD数据线、参考电压（VREF）、接收器（Receiver）、驱动器控制、热关断电路以及电源复位等，这些组件协同工作，确保了MCP2551在CAN总线系统中的高效、可靠运行。

MCP2551

1.5 TXD Permanent Dominant

Detection

If the MCP2551 detects an extended Low state on the

TXD input, it will disable the CANH and CANL output

drivers in order to prevent the corruption of data on the

CAN bus. The drivers are disabled if TXD is Low for

more than 1.25 ms (minimum). This implies a

maximum bit time of 62.5 µs (16 kb/s bus rate),

allowing up to 20 consecutive transmitted Dominant

bits during a multiple bit error and error frame scenario.

The drivers remain disabled as long as TXD remains

Low. A rising edge on TXD will reset the timer logic and

enable the CANH and CANL output drivers.

1.6 Power-on Reset

When the device is powered on, CANH and CANL

remain in a high-impedance state until V

DD reaches the

voltage-level V

PORH. In addition, CANH and CANL will

remain in a high-impedance state if TXD is Low when

VDD reaches VPORH. CANH and CANL will become

active only after TXD is asserted High. Once powered

on, CANH and CANL will enter a high-impedance state

if the voltage level at V

DD falls below VPORL, providing

voltage brown-out protection during normal operation.

1.7 Pin Descriptions

The 8-pin pinout is listed in Table 1-3.

TABLE 1-3: MCP2551 PINOUT

1.7.1 TRANSMITTER DATA INPUT (TXD)

TXD is a TTL-compatible input pin. The data on this pin

is driven out on the CANH and CANL differential output

pins. It is usually connected to the transmitter data

output of the CAN controller device. When TXD is Low,

CANH and CANL are in the Dominant state. When TXD

is High, CANH and CANL are in the Recessive state,

provided that another CAN node is not driving the CAN

bus with a Dominant state. TXD has an internal pull-up

resistor (nominal 25 kΩ to V

DD).

1.7.2 GROUND SUPPLY (VSS)

Ground supply pin.

1.7.3 SUPPLY VOLTAGE (V

)

Positive supply voltage pin.

1.7.4 RECEIVER DATA OUTPUT (RXD)

RXD is a CMOS-compatible output that drives High or

Low depending on the differential signals on the CANH

and CANL pins and is usually connected to the receiver

data input of the CAN controller device. RXD is High

when the CAN bus is Recessive and Low in the

Dominant state.

1.7.5 REFERENCE VOLTAGE (VREF)

Reference Voltage Output (defined as VDD/2).

1.7.6 CAN LOW (CANL)

The CANL output drives the Low side of the CAN

differential bus. This pin is also tied internally to the

receive input comparator.

1.7.7 CAN HIGH (CANH)

The CANH output drives the high-side of the CAN

differential bus. This pin is also tied internally to the

receive input comparator.

1.7.8 SLOPE RESISTOR INPUT (RS)

The RS pin is used to select High-Speed, Slope-Control

or Standby modes via an external biasing resistor.

Number

Name

Pin Function

1 TXD Transmit Data Input

SS Ground

DD Supply Voltage

4 RXD Receive Data Output

5VREF Reference Output Voltage

6 CANL CAN Low-Level Voltage I/O

7 CANH CAN High-Level Voltage I/O

S Slope-Control Input

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