I have been looking everywhere for a method to use i2c over a 12-48V DC power bus.

Are their any current IC solutions that I could check out?

If not where would be a good place to start on such a design? I know I could put an rf choke in before I inject the comm's and after I take it out but that really only works with >1MHz.

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    \$\begingroup\$ Why do you want to communicate over a DC bus, instead of adding a separate communication bus? \$\endgroup\$ – Nick Alexeev Aug 5 '13 at 3:28
  • \$\begingroup\$ I have a specific task and I just want to know if you can do i2c over DC. If it needs >$8 in parts it would be cheaper to run more wires but things like water tight connectors and high temperature wiring is not cheap. \$\endgroup\$ – uMinded Aug 5 '13 at 3:55
  • \$\begingroup\$ You may need a signalling scheme without a dc component, or to modulate a carrier. Think of it as building a radio modem. \$\endgroup\$ – Chris Stratton Aug 5 '13 at 6:08
  • \$\begingroup\$ @uMinded Perhaps, you could look into chipsets for powerline modems. Can't think of other commodity things (around $8), which could fit your requirement. \$\endgroup\$ – Nick Alexeev Aug 5 '13 at 6:39
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    \$\begingroup\$ There's Dallas Semiconductor's 1-wire system, which is worth looking at. Or the various model train control systems ("DCC"). \$\endgroup\$ – pjc50 Aug 5 '13 at 7:01

Cypress seem to have a suitable I2C power-line modem device (CY8CPLC10) and provides reference designs for 12 to 24V DC power-lines which you may be able to modify for 48V.

  • \$\begingroup\$ I took a quick look at the datasheet for this chip and I don't think this is what the OP is looking for. This chip uses I2C for access to the chip's memory. It is NOT a transparent I2C bridge! It could be used to implement communications using I2C but would require an I2C master (processor) at each end to read/write packets from/to the chip's memory. \$\endgroup\$ – DoxyLover Aug 5 '13 at 17:29
  • \$\begingroup\$ Yea adding a proc to each end would increase the price quite a bit. Not to mention those chips are $10 a piece... \$\endgroup\$ – uMinded Aug 5 '13 at 18:18
  • \$\begingroup\$ Somebody had downvoted this. @uMinded , was it you? \$\endgroup\$ – Nick Alexeev Aug 5 '13 at 18:46
  • \$\begingroup\$ @Nick: Not me. Do you know of any discrete component powerline comms projects? \$\endgroup\$ – uMinded Aug 5 '13 at 20:03

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