CAN Flexible Data-rate transceiver provides universal automotive solution

March 26, 2015 // By Graham Prophet
Microchip’s MCP2561/2FD transceivers withstand harsh conditions while increasing maximum data-rate capability and meeting lower power budgets; they support existing CAN communication standards and provide an upgrade path to CAN FD, which will increase application bandwidth and reduce production costs. These controllers add flexibility with options for split-termination or internal level-shifting.

These CAN FD (Controller Area Network Flexible Data-Rate) transceivers, are an interface between a CAN protocol controller and the physical two-wire CAN bus, serving both the CAN and CAN FD protocols. This product family not only helps automotive and industrial manufacturers with today’s CAN communication needs, but also provides a path for the newer CAN FD networks.

More Electronic Control Units (ECUs) are being added to existing CAN buses, causing automotive OEMs to become bandwidth limited. In addition, the end-of-line programming time for ECUs is on the rise due to more complex application programmes and calibration, which raises production-line costs. The emerging CAN FD bus protocol solves these issues by increasing the maximum data rate while expanding the data field from 8 data Bytes up to 64 data Bytes.

With robustness and features including data rates of up to 8 Mb/sec, Microchip’s MCP2561/2FD transceivers enable customers to implement and realise the benefits of CAN FD. These transceivers have one of the industry’s lowest standby current consumption (<5 µA typical), helping to meet ECU low-power budget requirements. In addition, these devices support operation in the -40 to 150 degrees Centigrade temperature range, enabling usage in harsh environments.

MCP2561/2FD CAN FD transceivers are available in 8-pin PDIP, SOIC and 3 x 3 mm DFN (leadless) packages. The family also provides two options: The MCP2561FD comes in an 8-pin package and features a SPLIT pin that helps to stabilise the common mode in biased split-termination schemes. The MCP2562FD is available in an 8-pin package and features a Vio pin which can be tied to a secondary supply in order to internally level-shift the digital I/Os for easy microcontroller interfacing. This is beneficial when a system is using a microcontroller at a Vdd less than 5V (for example, 1.8V or 3.3V), and eliminates the need for an external level translator, decreasing system cost and complexity.

Microchip adds that the transceivers will be used to