RS485/ RS422 3.3V device that interface to 5V device

Hi,

In my costume electronic card I have a half-duplex, ~12Mbps, RS485/RS422 Transceivers, LTC2862-1 device with 3.3Vbus. Now I want to connect to another, external LTC2862-2 device with 5Vbus (with max baud rate of ~115200bps which is O.K for both devices).

My question is that: Is it possible to connect those two devices without enable any self-protection mechanism of ether devices- in order to maintain the max devices ratability? (3.3V Vbus device that interface with 5V Vbus device and high baud rate device that interface with limited baud rate device)

Thanks,

Idan

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  • Hi Idan,

    Both the LTC2862-1 and LTC2862-2 have a receiver up that receive data at up to 20Mbps. Your application should work without issue, the LTC2862-2 will be able to receive the 12Mbps data from the LTC2862-1, and transmit 115200bps data back.

    Both the transmitter and receiver have a wide common mode range of +25V to -25V, so there will be no issue connecting a 3.3V device to a 5V device, once you have terminated the bus.

    Regards,

    Neil

Reply
  • Hi Idan,

    Both the LTC2862-1 and LTC2862-2 have a receiver up that receive data at up to 20Mbps. Your application should work without issue, the LTC2862-2 will be able to receive the 12Mbps data from the LTC2862-1, and transmit 115200bps data back.

    Both the transmitter and receiver have a wide common mode range of +25V to -25V, so there will be no issue connecting a 3.3V device to a 5V device, once you have terminated the bus.

    Regards,

    Neil

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