CAN FD transceiver family offers migration path from "old" CAN

March 24, 2015 // By Christoph Hammerschmidt
Driven by data-hungry applications under the engine bonnet, the new CAN FD data bus standard makes inroads to the automotive industry. With a family of transceivers, Microchip hurries to meet the growing demand. Microchip's new CAN FD transceivers withstand the harsh conditions under the hood and meets lower power budgets.

As an interface between a CAN protocol controller and the physical two-wire CAN bus, the MCP2561&2FD transceivers can serve both the traditional CAN and the new CAN FD protocols, providing a migration path for automotive electronics designers.

In-vehicle networking growth continues to be driven by the need for electronic monitoring and control. As application features increase in power train, body and convenience, diagnostics and safety, 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 their robustness and industry-leading features, including data rates of up to 8 Mb/s, Microchip’s MCP2561/2FD transceivers enable customers to implement and realise the benefits of CAN FD. The 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 Celsius temperature range, enabling usage in harsh environments.

The MCP2561/2FD product family is available in 8-pin PDIP, SOIC and 3x3 mm DFN (leadless) packages, providing additional design flexibility for space-limited applications. The family also provides two options: The MCP2561FD comes in an 8-pin package and features a SPLIT pin. This SPLIT pin 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. This Vio pin 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 and eliminates the need for an external level translator,