MCP2551 Overview
The MCP2551 is a high-speed and high-fault-tolerant device used as a connection interface between the CAN protocol controller and the physical bus. It provides differential transmission and reception functions to the CAN protocol controller, fully compliant with the ISO-11898 standard, including 24V requirements.
In a typical CAN system, each node must have a device to convert the digital signals generated by the CAN controller into signals transmitted on the bus cable (differential output). This device provides a buffer between the CAN controller and the CAN bus, avoiding high-voltage transients generated by external factors such as EMI, ESD, and electrical transients.
MCP2551 Pin Configuration
Pin Function
| Pin No. | Pin Name | Function |
|---|---|---|
| 1 | TXD | CAN transmit data output |
| 2 | VSS | Ground |
| 3 | VDD | Positive power supply voltage input |
| 4 | RXD | CAN receive data input |
| 5 | VREF | Reference voltage output for CAN controller |
| 6 | CANL | CAN low-side output |
| 7 | CANH | CAN high-side output |
| 8 | RS | Slope control input for CANH and CANL lines |
MCP2551 Features
- Supports operation up to 1 Mb/s
- Meets the physical layer requirements of the ISO-11898 standard
- Suitable for use with both 12V and 24V systems
- External control slope to reduce RFI emissions
- TXD input includes ground fault detection
- Power-on reset and undervoltage protection
- Disconnected or powered-off nodes will not interfere with the CAN bus
- Low-current standby mode
- Protected against damage from short circuits and high-voltage transients
- Includes automatic thermal shutdown protection
- Up to 112 nodes to reduce noise
MCP2551 Specification
| Manufacturer | Microchip |
|---|---|
| Product type | CAN Interface Integrated Circuit |
| Mounting style | SMD/SMT |
| Package/case | SOIC-8 |
| Series | MCP2551 |
| Type | CAN Controller |
| Data rate | 1 Mb/s |
| Number of drivers | 1 |
| Number of receivers | 1 |
| Maximum supply voltage | 5.5 V |
| Minimum supply voltage | 4.5 V |
| Operating supply current | 75 mA |
| Minimum operating temperature | -40°C |
| Maximum operating temperature | +125°C |
| ESD protection | 6 kV |
| Package | Tube |
| Trademark | Microchip Technology/Atmel |
| Moisture sensitivity level | Yes |
| Number of transceivers | 1 |
| Operating supply voltage | 5V |