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Author Topic: Need help finding a I2C chip  (Read 724 times)
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MAXPAYNE
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« on: November 12, 2014, 07:43:24 07:43 »

Is there any I2C chip available which will do the following functions as attached image ?

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UncleBog
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« Reply #1 on: November 12, 2014, 08:36:07 08:36 »

Hello Maxpayne,

There are many from manufacturers such as TI, NXP and Maxim in particular. Google 'I2C parallel port expander'.
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MAXPAYNE
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« Reply #2 on: November 12, 2014, 09:25:37 09:25 »

Looks like I need 2 bit expander Tongue
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CocaCola
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« Reply #3 on: November 12, 2014, 06:18:40 18:18 »

Are the IC2 lines locked into being dedicated IC2 lines, or could you simply turn them into digital I/O and skip needing another clip?
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MAXPAYNE
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« Reply #4 on: November 12, 2014, 06:39:20 18:39 »

they are dedicated I2C line
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Old_but_Alive
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« Reply #5 on: November 12, 2014, 08:02:33 20:02 »


 TI Home > Semiconductors > Interface > I2C > I2C IO Expander >
PCF8574A (ACTIVE)

Remote 8-Bit I/O Expander for I2C-Bus

that seems to be the simplist, but you only use 2 out of the 8 outputs
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Parmin
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« Reply #6 on: November 12, 2014, 10:11:04 22:11 »

I would use a PIC10 in SOT23
Add a simple logic program and it would do the required function.
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PICker
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« Reply #7 on: November 12, 2014, 10:31:16 22:31 »

Have a look to this port expander:
http://www.ti.com/lit/ds/symlink/pca9536.pdf
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CocaCola
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« Reply #8 on: November 12, 2014, 10:35:04 22:35 »

I would use a PIC10 in SOT23
Add a simple logic program and it would do the required function.

I was going to suggest the same, especially since I keep an handful of 6 and 8 pin PICs on hand just for trivial task like this, the SOT23 micros are "so cute" that I actually get a kick out of using them Smiley ...  I personally use micros as Swiss Army Knife ICs all the time, for me it's just cost effective to have one chip in the drawer that can do 1000s of things vs having 1000s of chips in the drawer that can only do one thing, but I know a lot of people frown upon that and are adamant that people use dedicated fixed solid state chips for such task...
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Old_but_Alive
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« Reply #9 on: November 13, 2014, 07:50:17 07:50 »

I considered advising an 8 pin PIC, but decided its a wole different ball game , and 100 times more complicated than a $0.50 chip where its all done for you, rather than a weeks work, debugging, programming etc etc

dont forget, maxpayne wont have any experience with rolling his own, so it would take a week !!!
« Last Edit: November 13, 2014, 07:53:10 07:53 by Old_but_Alive » Logged
CocaCola
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« Reply #10 on: November 13, 2014, 09:25:01 09:25 »

and 100 times more complicated than a $0.50 chip where its all done for you, rather than a weeks work, debugging, programming etc etc

Yeah experience and coding ability does come into play for sure, it could certainly take you from a few painless minutes of development and debugging to weeks, although I cringe at the idea that it could take weeks...
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« Reply #11 on: November 13, 2014, 10:06:40 10:06 »

I considered advising an 8 pin PIC, but decided its a wole different ball game , and 100 times more complicated than a $0.50 chip where its all done for you, rather than a weeks work, debugging, programming etc etc

dont forget, maxpayne wont have any experience with rolling his own, so it would take a week !!!
I bet its for the turn indicator, on his power skateboard. Smiley
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« Reply #12 on: November 13, 2014, 10:59:44 22:59 »

Well as they said.. there are 10 types of people in the world, those that code and those that...
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