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Geoffg

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Joined: 06/06/2011
Location: Australia
Posts: 3282

Posted: 12:54pm 30 Oct 2014

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I have come across this new chip which could be quiet useful:
http://www.analog.com/static/imported-files/data_sheets/AD55 93R.pdf

It is an eight port I/O chip with an I2C interface. What is outstanding is that any pin can be independently configured as an:
- Analog output (ie, DAC)
- Analog input (ie, ADC)
- Digital input (with optional pulldown)
- Digital output (normal or open collector)

The DAC and ADC are 12 bit and it includes a 0.5% accurate voltage reference. It makes a great general purpose I/O chip.

I have asked for some samples - now to think up an interesting application...

Geoff

Geoff Graham - http://geoffg.net

Grogster

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Joined: 31/12/2012
Location: New Zealand
Posts: 9589

Posted: 01:46pm 30 Oct 2014

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How much?

Smoke makes things work. When the smoke gets out, it stops!

JohnL
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Joined: 10/01/2014
Location: Seychelles
Posts: 128

Posted: 01:56pm 30 Oct 2014

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More than US$7each for qty 10 from Digkey. No thanks.

If speed is not an issue, better option is to configure a ucontroller as universal I/O device. Many low end ucontrollers don't have DACs.

Edited by JohnL 2014-10-31

Grogster

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Location: New Zealand
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Posted: 02:14pm 30 Oct 2014

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I have successfully used a 2nd(or 3rd!) MicoMite IC on I2C to act as port expansion. My model elevator project uses three MM chips. One is a CPU(the master), one is an input controller(slave #1), and the third one is an output controller(slave #2).

A triple-core MicroMite.

There was also a MCP serial port-expansion chip that talked on I2C - I forget the part number.

Smoke makes things work. When the smoke gets out, it stops!

Zonker

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Joined: 18/08/2012
Location: United States
Posts: 767

Posted: 03:44pm 30 Oct 2014

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Wow..!

Great find Geoff.. In one chip, you could design several different kinds of interface boards with 12bit analog and digital control... awesome I can think of a few uses right off... Will have a read of this one...

Thanks.!

TassyJim

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Joined: 07/08/2011
Location: Australia
Posts: 6269

Posted: 04:39pm 30 Oct 2014

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12 bit DAC and ADC in one package is very useful.

Jim

VK7JH
MMedit

jman

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Joined: 12/06/2011
Location: New Zealand
Posts: 711

Posted: 07:35pm 30 Oct 2014

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Geoff

That's a great I2C device I have ordered some samples I post the results here
when they arrive

Jman

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