LT's New CAN Transceiver with Overvoltage Protection for Line Faults

The Linear Technology LTC2875 works on both 3.3V and 5V systems, together with Overvoltage Protection up to 60V

The LTC2875 from Linear Technology (now part of Analog Devices), is an exceptionally rugged, high voltage tolerant CAN (controller area network) transceiver that greatly reduces field failures without the need of costly external protection devices.

In practical CAN systems, installation cross-wiring faults, ground voltage faults or lightning induced surge voltages can cause overvoltage conditions that exceed absolute maximum ratings of typical transceivers. The LTC2875 features ±60V overvoltage fault and ±25kV HBM ESD protection on the data transmission lines, protecting bus pins during operation and shutdown. Whether a circuit is transmitting, receiving or powered off, the LTC2875 tolerates any voltage within ±60V without damage, increasing the robustness of typical CAN networks.

CAN bus systems are becoming increasingly popular in industrial controls, instrumentation networks and automotive electronics. The CAN bus has a well defined protocol stack, with support for standalone controllers, FPGAs and ASICs, making implementation easier over alternative interfaces, such as RS485. The LTC2875 provides the flexibility to be powered from a 3.3V or 5V rail, which is very useful in industrial applications where a 5V rail may not be present. In addition to the high fault and ESD protection, the device features a low electromagnetic emission (EME) driver with a transmit data (TXD) dominant timer to prevent faulty controllers from clamping the bus, as well as a high electromagnetic immunity (EMI) receiver with an extended ±36V common mode range to enable operation in electrically noisy environments and in the presence of ground loops. The LTC2875 features a high speed data rate of 4Mbps with an adjustable slew rate for data rates as low as 1kbps. A shutdown mode brings all of the LTC2875's outputs to high impedance and reduces power consumption to 1µA.

The LTC2875 is offered in commercial, industrial, automotive and military (55°C to 125°C) temperature grades and is available in 3mm x 3mm DFN-8 and SO-8 packages, with industry-standard pinouts.

Features of the LTC2875 include:

For more information on the LTC2875 CAN Transceiver, visit the Analog Devices website at Linear Technology LTC2875 product page.

The Analog Devices website address is www.analog.com
[Reprinted with kind permission from Linear Technology - Release Date: 17th February, 2015]