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'[EE] What chip am I looking for?'
2007\06\21@161639 by William Couture

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Hi all!

I know this chip exists, but I'm not an EE and I'm not having much luck
with google.

I want an SPI chip that gives me an output port, at least 5 bits.

Send 0x06 to chip --> chip clear output bits 0, 3, 4, etc. and sets
output bits 1, 2.

Thanks,
  Bill

--
Psst...  Hey, you... Buddy...  Want a kitten?  straycatblues.petfinder.org

2007\06\21@162826 by Kevin Timmerman

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An ordinary shift register can be driven by an SPI port. 74HC595 for
example. Just toggle the output latch input after sending a byte via SPI.


At 04:16 PM 6/21/2007, you wrote:
{Quote hidden}

2007\06\21@163002 by Marcel Birthelmer

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Like a Serial-to-Parallel shift register? It's effectively
SPI-compatible, since it has a clock line and a signal line. I think
they're commonly available in 8-bit.

http://www.play-hookey.com/digital/shift-in_register.html

- Marcel

On 6/21/07, William Couture <spam_OUTbcoutureTakeThisOuTspamgmail.com> wrote:
{Quote hidden}

> -

2007\06\21@163742 by William Couture

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On 6/21/07, William Couture <.....bcoutureKILLspamspam@spam@gmail.com> wrote:
> Hi all!
>
> I know this chip exists, but I'm not an EE and I'm not having much luck
> with google.
>
> I want an SPI chip that gives me an output port, at least 5 bits.
>
> Send 0x06 to chip --> chip clear output bits 0, 3, 4, etc. and sets
> output bits 1, 2.

Actually, I've found it -- MCP23S08

Thanks,
  Bill

--
Psst...  Hey, you... Buddy...  Want a kitten?  straycatblues.petfinder.org

2007\06\21@163842 by Marcel Duchamp

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William Couture wrote:
> Hi all!
>
> I know this chip exists, but I'm not an EE and I'm not having much luck
> with google.
>
> I want an SPI chip that gives me an output port, at least 5 bits.
>
> Send 0x06 to chip --> chip clear output bits 0, 3, 4, etc. and sets
> output bits 1, 2.
>
> Thanks,
>    Bill
>

Here's some that floated to the top of google:
1. MAX7317
2. PCA9502 8-bit I/O expander with I2C-bus/SPI interface
3. MCP23017 (MICROCHIP)
4. roll your own with a PIC
5. search for more; they're out there

FYI, I searched on "spi expander"...

2007\06\21@172359 by Herbert Graf

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On Thu, 2007-06-21 at 16:16 -0400, William Couture wrote:
> Hi all!
>
> I know this chip exists, but I'm not an EE and I'm not having much luck
> with google.
>
> I want an SPI chip that gives me an output port, at least 5 bits.
>
> Send 0x06 to chip --> chip clear output bits 0, 3, 4, etc. and sets
> output bits 1, 2.

Sounds like you just need a shift register. Do a search for TTL shift
registers, or use a CPLD/PAL.

TTYL

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