µModule transceiver meets IEC 60601-1 requirements

Linear Technology has introduced the LTM2885, an isolated RS485 µModule transceiver for guarding against large ground-to-ground differentials.

The LTM2885 provides 6500V rms reinforced isolation between the logic level interface and the transceiver bus pins, which – according to the company – surpass the IEC 60747 basic and reinforced isolation standards. With creepage and clearance distances greater than 14mm and a distance through insulation greater than 0.2mm, the LTM2885 is said to exceed many overvoltage category II and material group IIIA equipment requirements, including the provision of two means of patient protection for medical equipment per IEC 60601-1.

Features include a ±15kV ESD-protected RS485 transceiver operating at 20Mbit/s or low EMI 250kbit/s, with uninterrupted communication for common mode transients up to 50kV/µs. An internal low EMI DC/DC converter powers the transceiver and provides an isolated 1W supply output for powering external support components.

The device has integrated selectable 120Ω termination and it is possible to add or remove termination anywhere on the bus via software control. Operating from a 5V supply, the LTM2885 is said to require no additional external components, providing a self-contained μModule solution for isolated RS485 serial data communications.

The LTM2885 is offered in commercial, industrial and automotive versions, in a 22 x 9 x 5.16mm surface mount BGA package and supporting temperatures ranging from 0 to 70°C, –40 to 85°C, and –40 to 105°C.

Additional features:

  • Isolated DC power: 5V at up to 200mA
  • 1.62V to 5.5V logic supply pin for flexible digital interface
  • General purpose CMOS isolated channel
  • Author
    Peggy Lee