Subject:
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Re: Brainstorms
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 12 Aug 2002 06:39:23 GMT
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Original-From:
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Matt Lawrence <matt@technoroninANTISPAM.com>
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Viewed:
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775 times
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On Sun, 11 Aug 2002, Steve Baker wrote:
> Are you sure? I thought Philips had teeny-tiny microprocessors with
> I2C at least 10 years ago...before the I2C bus switched speeds from 100kbps
> to 400kbps. I2C is about 20 years old.
I did a project with the Philips chips several years ago. I2C worked very
well, the smallest chip I used was a 87C751. A little bit bigger than an
8-pin chip, but available in surface mount packages. Also, a friend of
mine used a 751 as an I2C multiplexor, 1 bus in and 8 busses out.
> > My biggest problem with I2C is addressing. Each device needs
> > needs to have its address pins properly set.
>
> Address pins? What address pins?
I think the addressing problem can be solved with random numbers and some
serious bus scanning. Failing that, burning a serial number into each
chip isn't that hard either. It would still require quite a bit of bus
scanning, but even if the startup took several seconds, I don't see it as
a problem.
-- Matt
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Message has 1 Reply:
 | | Re: Brainstorms
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| (...) [snip Philips uC] (...) The I2C bus is not really designed to support a bus scan. I'm not saying it can't be done, but I certainly haven't figured out how to do it. Until I see somebody who gives an extremely detailed description of how they (...) (22 years ago, 13-Aug-02, to lugnet.robotics)
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Message is in Reply To:
| | Re: Brainstorms
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| (...) Are you sure? I thought Philips had teeny-tiny microprocessors with I2C at least 10 years ago...before the I2C bus switched speeds from 100kbps to 400kbps. I2C is about 20 years old. (...) Address pins? What address pins? ---...--- Steve Baker (...) (22 years ago, 11-Aug-02, to lugnet.robotics)
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