MCP2551-I/SN

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1. Describe

MCP2551-I/SN is a high-speed CAN, fault-tolerant Device as an interface between CAN Protocol controller and physical bus. MCP2551 The device provides differential transmission and reception The ability of CAN protocol controller, and completely Compatible with ISO-11898 standard, including 24V Require. It will run at speeds up to 1 Mb/s. Generally, each node in the CAN system must have one Device for converting generated digital signal CAN controller to a signal suitable for transmission Bus wiring (differential output). It also provides a Buffer between CAN controller and high voltage Spikes that can be generated on the CAN bus External sources (EMI, ESD, electrical transients, etc.).

2. Feature

    1. Support 1 Mb/s operation

    2. Implement ISO-11898 standard physical layer requirements

    3. Suitable for 12V and 24V systems

    4. External control slope to reduce RFI radiation

    5. Detect a ground fault on the TXD input (permanent dominant)

    6. Power-on reset and voltage power-down protection

    7. Unpowered nodes or power-down events will not Interference CAN bus

    8. Low current standby operation

    9. Prevent short circuit damage Condition (positive or negative battery voltage)

  10. Prevent high voltage transients

  11. Automatic thermal shutdown protection

  12. Up to 112 nodes can be connected

  13. High noise immunity brought by differential bus implement

  14. Temperature range:-Industrial (I): -40°C to +85°C-Extended (E): -40°C to +125°C

3. Internal protection

CANH and CANL prevent battery short circuit Circuit and electrical transients may occur in CAN bus. This feature prevents damage Transmitter output stage under this fault condition. The device is further protected from excessive current Load via thermal shutdown circuit, disable Output driver when junction temperature exceeds The nominal limit is 165°C. All other parts of the chip Keep running, and due to reduced power consumption, the chip temperature is reduced Transmitter output. This protection is for Prevent damage caused by bus short circuit.

4. Launch function

The CAN bus has two states: Dominant and Recessive. When dominance occurs The differential voltage between CANH and CANL is Greater than the defined voltage (for example, 1.2V). Recessive When the differential voltage is less than one The defined voltage (usually 0V). Dominate and Recessive state corresponds to Low and High state TXD input pins, respectively. However, a The dominance state initiated by another CAN node will Override the recessive state on the CAN bus.

5. Product configuration