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Topic: SPI -> RS485 -> SPI with MAX3140 (Read 280 times) previous topic - next topic

Ziplock9000

I've just found this wonderful chip that converts SPI to RS485/422 and back again for longer and more EMI tolerant bus runs.
After Googling and looking at specific websites I was surprised that there are no modules on that market that have the chip and support circuitry already set up ready to be used with a microcontroller.

So my question is multi-part:

1) Does anyone know where these modules exist and can be bought?
2) If they don't exist, does anyone know a good working circuit that would work? (Data sheet examples are not always the best).
3) Same as above for I2C


On a side note, I know there are MAX490 modules, but they only process one TTL wire at a time.

pylon

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1) Does anyone know where these modules exist and can be bought?
Not seen one yet.

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2) If they don't exist, does anyone know a good working circuit that would work? (Data sheet examples are not always the best).
The datasheet example is quite straight forward, I would try that one (full- as well as half-duplex).

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3) Same as above for I2C
The chip doesn't support I2C.

Ziplock9000

The datasheet example is quite straight forward, I would try that one (full- as well as half-duplex).
Have you tried this circuit? I'm looking for *working* confirmation of it's reliability not hypothetical.


The chip doesn't support I2C.
That's not what I asked and you know it.

ron_sutherland

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I'm looking for *working* confirmation of it's reliability not hypothetical.
I can confirm that this is a forum on the internet and everything on it is hypothetical.
I use an R-Pi Zero on an RPUpi shield to have a tool-chain at the network edge.

pylon

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Have you tried this circuit? I'm looking for *working* confirmation of it's reliability not hypothetical.
No, I haven't used the MAX3140 yet. But don't you think that the manufacturer did try it before putting the circuit into the datasheet? If you distrust the datasheets you will have a hard life in the electronics world. I would say it's on you to try that circuit. If it doesn't work you can post your problems here.

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That's not what I asked and you know it.
No, I don't know. If I misunderstood your question you probably should ask in a bit more detail, don't you think too?

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