pic raymarine seatalk bus interface

Posted on Feb 7, 2014

I`m working on a project with a PIC to communicate with the Raymarine SeaTalk bus. The link below is the part of the schematic diagram of a Raymarine instrument. The logic chip is connected to the TX and RX connections on the right, and the SeaTalk signals and power enter top left. I want to simplify the right half of this circuit. I know it can b

pic raymarine seatalk bus interface
Click here to download the full size of the above Circuit.

e done with fewer components, as this Simple Circuit shows: This simple circuit however was done without prior access the the official circuit above; I was hoping that having the original circuit would help in designing a better simple one. I`ve tried to follow what the original circuit does that the simple one doesn`t, but I`m struggling. Inversion doesn`t matter, as I can chose how I bit-bang the bus. Baud rate is 4800, the SeaTalk bus is a 12V bus, the logic side is 5V in the original, but 3. 3V in my device. I saw you asked for a "bus driver IC" but in the same sentence you asked about "reducing the component count". In engineering terms using two transistors and 3 resistors beats using a specialised IC and whatever support components the IC needs. Like I said, the simple circuit was created without prior knowledge of the original. If such a simple circuit was sufficient, the original manufacturers would have used it when the product was designed over 10 years ago. There are many driver ICs now available at little cost, so it seems sensible to use one, assuming a suitable one can be found.

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