Re: Simple multi-channel serial ADC (8-ch)?

On Feb 17, 8:03 pm, "bungalow_st...@xxxxxxxxx"
<bungalow_st...@xxxxxxxxx> wrote:
On Feb 17, 9:24 pm, Joerg <notthisjoerg...@xxxxxxxxxxxxxxxxxxxxx>
wrote:



bungalow_st...@xxxxxxxxx wrote:
On Feb 16, 8:01 pm, Joerg <notthisjoerg...@xxxxxxxxxxxxxxxxxxxxx>
wrote:

Marte Schwarz wrote:

Hi Jörg,

May be you want to use a very cheap ATtiny with a 4067 as Mux? I'm sure
this isn't to beat. for low data rate you can create your own quad slope
AD using the cheapest controller to be found.

Or use a cheap 1-channel ADC and a HC4051. That's really hard to beat.

I would prefer a µC so you can implement the control of the 4051 with the
same timen than the ADC and the SPI/I2C or whatever else. Have a buffer,
possibility of averaging... and the noise is almost from peripheral clocks,
you don't need this with several µC. They can be very quiet, I guess more
quiet than a discrete ADC with external oscillator pin.

Yes, probably a uC could work here if clocked slowly. It doesn't have to
do much. But there is one more pain left (don't I always find a hair in
the soup?): Programming it. Beats me why companies like TI keep their
SBW details a secret. They also do not provide a simple download tool.
By simple I mean something that can be clicked from a PC and then
automatically download into the uC. The user interface should consist of
an *.exe file that gets double-clicked from Windows Explorer, no more.
Currently you have to use one of the programming suites for that. I use
IAR and I am comfortable with it but a biomedical engineer who does
mostly mechanical and chemistry stuff won't be. I can't expect my
clients to learn a design suite to program my boards. At least not the
smaller companies among them.

The analog/mixed solution I am designing now will not have that
programming hassle. Somebody stuffs it, somebody tests it (probably me),
then build a few dozen more, a tech tests those and then plops them all
into the system rack.

--
Regards, Joerg

http://www.analogconsultants.com-Hidequoted text -

- Show quoted text -

why would your clients be programming your boards?

Because they are contractually their boards :-)))

But seriously, suppose they'd want a minor mod. With a proper downloader
I'd do it, send it to them and tell them to connect the board, then
double-click modgizmo.exe or something like that.

Without, it goes something like this: Do the mod, go to the SWA or
Jetblue web site, book flight, book hotel, book rental car, fly x hours,
rent car, crash in hotel bed, drive to client, program boards, drive
back to airport, get in traffic jam because some knucklehead speeded and
spun out, miss last flight...

--
Regards, Joerg

http://www.analogconsultants.com-Hide quoted text -

- Show quoted text -

Yes but compare that to the mess that would occur if your customer
wanted a mod to your serial based stand alone A/D board (it would be a
HW mod)

There is no reason why you can't consider a CPU based A/D a piece of
unprogrammable hardware. Once you program it, put it on the board and
make no accommodations what-so- ever to reprogram it.

Tell that to the Honeywell Engineers who are recalling their products
built with flash based uC. Show me how to convince my customer who
would never consider "flash" permanent.



.

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