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'[OT]small, low power uarts?'
1999\04\26@143809 by Dave Johnson

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I'm looking for a low power uart in a very small package for a handheld
device. Any suggestions? TI has the major contender right now (TL16C550),
who else makes uarts in teensy packages? Single async I/O channel is fine.

Thanks,

Dave Johnson

1999\04\26@151448 by Barry King

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Dave,

Why can't you use the UART in the PIC?  Or even bit bang it?
Aren't 16550s a parallel interface, like ISA bus?  Very messy to
drive from a PIC...

------------
Barry King, KA1NLH
Engineering Manager
NRG Systems "Measuring the Wind's Energy"
Hinesburg, Vermont, USA
spam_OUTbarryTakeThisOuTspamnrgsystems.com
"The witty saying has been deleted due to limited EPROM space"

1999\04\26@155222 by Dave VanHorn

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> I'm looking for a low power uart in a very small package for a handheld
> device. Any suggestions? TI has the major contender right now (TL16C550),
> who else makes uarts in teensy packages? Single async I/O channel is fine.


Yuuuk!  Max 3100!!  It's a 16 pin SO, and also available in DIP for
prototypes.
It talks SPI, but you can bit-bang that.

1999\04\26@164555 by Dave Johnson

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>Why can't you use the UART in the PIC?
Sorry, I forgot to say: I need to evaluate a PIC solution AND a PICless
one. The PICless version would need a discrete UART (that's the real
reason for the [OT] header: this design won't use a PIC). My bias, of
course, is for the PIC solution, but I'm trying to be objective for the
bosses :-)

Dave Johnson

1999\04\27@083218 by wwl

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On Mon, 26 Apr 1999 13:43:41 -0700, you wrote:

>>Why can't you use the UART in the PIC?
>Sorry, I forgot to say: I need to evaluate a PIC solution AND a PICless
>one. The PICless version would need a discrete UART (that's the real
>reason for the [OT] header: this design won't use a PIC). My bias, of
>course, is for the PIC solution, but I'm trying to be objective for the
>bosses :-)
>
>Dave Johnson
A PIC12C508 or 16C505 would porobably cheaper than any off-the-shelf
UART

1999\04\27@101557 by Dave Johnson

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>A PIC12C508 or 16C505 would porobably cheaper than any off-the-shelf
>UART
Neither has a UART, so won't help much directly (I've done the async
serial bit-bang before, and don't care to do it again :-). However, one
of these in combination with the MAX3100 might make a nice little serial
port solution, and I only have to bit-bang the SPI side of the 3100.
Hmmm...

Dave Johnson

1999\04\27@102442 by Tjaart van der Walt

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Dave Johnson wrote:
>
> >A PIC12C508 or 16C505 would porobably cheaper than any off-the-shelf
> >UART
> Neither has a UART, so won't help much directly (I've done the async
> serial bit-bang before, and don't care to do it again :-). However, one
> of these in combination with the MAX3100 might make a nice little serial
> port solution, and I only have to bit-bang the SPI side of the 3100.
> Hmmm...

...or you can use a Scenix, download the app-note and
get it to make you coffee between characters <GRIN>.
A SX28 will actually make a killer UART (or DUART).
You could even emulate a FIFO. We use a DUART on one
of our products, and it is pretty pricey. Hmmmmmm...

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