The LTM2889 from Linear Technology Corporation protects against large ground-to-ground differentials and common mode transients. In practical CAN systems, ground potentials vary widely from node to node, which can result in an interruption of communications or destruction of a transceiver. The transceiver and isolator module separates grounds by isolating the CAN transceiver using internal inductive isolation. It implements multiple levels of protection to significantly improve system reliability, including 2,500V_RMS of galvanic isolation, ±60V bus voltage fault tolerance, greater than 30kV/µs common mode transient immunity, and ±25kV HBM ESD protection. There are no external components required, ensuring a robust module for isolated serial data communications.

The integrated, low EMI, DC/DC converter powers the isolated transceiver and provides up to 0.75W of isolated power for CAN node components. The device features an extended ±36V common mode range to enable operation in electrically noisy environments and in the presence of ground loops. The module operates at data rates between 22kbit/s and 4Mbit/s, with an adjustable slew rate to reduce EMI at lower data rates.  A shutdown mode brings all of the module’s outputs to high impedance and reduces power consumption to less than 1µA.

Commercial, industrial and automotive temperature grades are available in a low profile 15 x 11.25 x 3.42mm surface mount BGA package. All ICs and passive components are housed in the RoHS-compliant µModule package.