Home-brewing an ignition advance control

[am018]

The 3 wire bus is called the SPI  bus  it is realk easy to use I use a very
simple 8 bit convertor of family the TLC548 in a couple of data loggers I
have built, the theoretical capacity of this chip is 40k conversions per
second  but driving from the printer port on a PC they still manage over 20k
conversion per second on rapidly changing signals. A lot of info on these
can be found  at these urls.

http://freeware.mcu.motsps.com/apps_help/modules/qsm/spi_adc.htm
http://www.ti.com/sc/docs/auto/mslp/rpl/dataconv.htm

Reagard Andy McF

Bill the arcstarter wrote:

> Andy Macf wrote:
> >I was looking at similar 12 channel (they give  11 data channels + self
> >test reference voltage) AD convertors recently from Texas Instruments
> >the
> >12 bit ones seem to operate at half the speed of the 8 bit ones.  The
> 10
> >bit TLC1540 looks interesting.
> >Andy Macf
>
> I'm not familiar with that part.  Do you have a url for it?  Are they a
> serial interface?
>
> The LTC1294 (there's a whole series of converters in that family)
> conversion rate is strictly controlled by the host processor.  The same
> clocked serial pulses used to configure and interrogate the chip
> actually sequence the approximation circuits inside.
>
> -Bill
>
> ______________________________________________________
> Get Your Private, Free Email at http://www.hotmail.com