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  • Dual HS CAN transceiver in 3V Microcontroller with Standby mode

  • Created: Sep 08, 2014

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The controller area network (CAN) is a standard for dispersed interchanges with built-in fault handling, indicated for the physical and data link layers of the open systems interconnection (OSI) model in ISO-11898. CAN have been widely adopted in industrial instrumentation applications and the automotive industry due to the inherent strengths of the communication mechanisms used by CAN. Features of CAN include: allowance for multiple masters on a bus, inherent priority levels for messages, bus arbitration by message priority, error detection and recovery at multiple levels, and synchronization of data timing across nodes with separate clock sources. At the physical layer, differential data transmission is supported by the CAN protocol, providing advantages such as bidirectional communications across a single pair of twisted cables, increased immunity to noise, wide common-mode range allowing differences in ground potential between nodes.

A transceiver is a device comprising both a transmitter and a receiver, which are combined and share common circuitry or a single housing. When no circuitry is common between transmit and receive functions, the device is a transmitter-receiver. The circuit uses a TJA1059 dual high-speed CAN transceiver that provides an interface between a Controller Area Network (CAN) protocol controller and the physical two-wire CAN-bus. The transceiver is designed for high-speed (up to 1 Mbit/s) CAN applications in the automotive and truck industries. It provides differential transmit and receive capabilities to a CAN protocol controller.

The TJA1059 belongs to the third generation of high-speed CAN transceivers from NXP Semiconductors, offering significant improvements over first- and second-generation devices such as the TJA1040. It offers improved Electromagnetic Compatibility (EMC) and Electrostatic Discharge (ESD) performance, and also features: Ideal passive behavior to the CAN-bus when the supply voltage is OFF, a very low-current standby mode with bus wake-up capability on both channels, can be interfaced directly to microcontrollers with supply voltages from 3V to 5V and complies with global OEM requirements, allowing a one-fits-all approach. These features make the TJA1059 an excellent choice for all types of HS-CAN networks containing more than one HS-CAN interface requiring a low-power mode with wake-up capability via the CAN-bus, especially for body control and gateway units.



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