4 Mbps CAN FD micro-module isolator with DC/DC power

September 14, 2016 // By Graham Prophet
LTM2889 is a fully ISO 11898-2 compliant CAN (controller area network) µModule (micromodule) transceiver and isolator that guards against large ground-to-ground differentials and common mode transients in 3.3V or 5V applications.

In practical CAN systems, Linear says, 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 improve system reliability, including 2,500 VRMS of galvanic isolation, ±60V bus voltage fault tolerance, greater than 30kV/µsec common mode transient immunity, and ±25 kV 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. 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 22 kbps and 4 Mbps, 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 1 µA.

 

The LTM2889 comes in commercial, industrial and automotive temperature grades and is available in a low profile 15 x 11.25 x 3.42 mm surface mount BGA package for $9.96 (1,000).

 

Linear Technology; www.linear.com/isolator