Robust new 4Mbps CAN FD micro module isolator improves reliability

Designed to guard against large ground-to-ground differentials and common-mode transients in 3.3V or 5V applications, Linear Technology has introduced the LTM2889, a new fully ISO 11898-2 compliant CAN (controller area network) µModule (micro module) transceiver and isolator. In practical CAN systems, ground potentials vary widely from node to node, often exceeding the tolerable range, which can result in an interruption of communications or destruction of a transceiver. The LTM2889 separates grounds by isolating the CAN transceiver using internal inductive isolation. It implements multiple levels of protection to significantly improve system reliability, including 2,500VRMS of galvanic isolation, ±60V bus voltage fault tolerance, greater than 30kV/µs common mode transient immunity, and ±25kV HBM ESD protection. The LTM2889 requires no external components, ensuring a complete and robust µModule solution for isolated serial data communications. The LTM2889 features an integrated, low EMI, DC-DC converter that powers the isolated transceiver and provides up to 0.75W of isolated power for CAN node components. In addition to the many built-in protection mechanisms, the device features an extended ±36V common mode range to enable operation in electrically noisy environments and in the presence of ground loops. The LTM2889 operates at data rates between 22kbps and 4Mbps, with an adjustable slew rate to reduce EMI at lower data rates. A shutdown mode brings all of the LTM2889’s outputs to high impedance and reduces power consumption to less than 1µA. The LTM2889 is offered in commercial, industrial and automotive temperature grades and is available in a low profile 15mm x 11.25mm x 3.42mm surface mount BGA package. All integrated circuits and passive components are housed in the RoHS-compliant µModule package, says the company.