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

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-Hide quoted 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. The serial stand
alone A/D doesn't have that feature, and it appears it's acceptable to
your customer, so why add it.

.

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