<snip
  Weird Yes? The straw that broke the camels back was the non linear
  nature of the MAF. I can program the chips as I already have a
  Motorola /Freescale programmer and the experience to do it. I'll
  sell them for less $5 plus shipping.

  You will need four as I would still do the 555 modular concept of
  one controller per injector.

  Or you can do it Vince if you wish at whatever you feel like charging.

  Does the TI chip have A to D and PWM out?

  Paul Lamar

Paul -

Yup, non-linear is a bitch to deal with.  Then again, all systems end
up non-linear or complex, which is why uC's are so damn popular.

And Paul, yes, the TI MSP430 has A/D and PWM out.  And D/A.  And
Timers.  And I2C.  And SPI.  And so on.  16 Registers.  16MHz 16 bit
RISC.  And remember ... such low power requirements that it runs on
fruit.  :)

I totally get you sticking with Motorola since you've already invested
in 1) the learning curve and 2) the programmer & development kit.  I'd
do the same thing if I were you.

For everyone else who's just getting started, go with the MSP430 -
it's $20 cheap to get started, great to learn on, and even better to
design with.

http://www.ti.com/corp/docs/landing/mcu/index.htm?DCMP=MSP430&HQS=Tools+OT+ez430
http://focus.ti.com/docs/toolsw/folders/print/ez430-f2013.html

Regarding me doing the MAF/uC Injection Controller - nope.  Not yet.

I will do this group the favor of NOT taking on a third project until
I complete the first - the Returnless PWM Fuel Pump Controller.  I am
still searching for mass-produced automotive fuel pressure sensors.

My second project will be a Flywheel CAS Sensor where I test the NXP
KMI15/4 rotational speed sensor.
http://www.nxp.com/acrobat_download/datasheets/KMI15_4_4.pdf

I'll stick to one project at a time.

-Vince Orton




Vince,

Where are you buying small quantity of the KMI15/4 sensor?

Neither Digikey nor Mouser sell quantity one units. Looks like a minimum quantity is around 800 pcs (T&R).

Admitted I could get samples for my Arrow FAE, but looking online at arrow's web site, they are not stocked.

I hate designing stuff around "unobtainium" parts.   Semiconductor sector is picking up, but our lead times are being pushed out from 12 weeks to 20 weeks due to demand (to save money everyone dropped inventories), so as things ramp back up you'll see allocation.

One tip for aircraft/automotive is to see if they sell a -40C to +125C (automotive) version of the part. Even it you use the -40C to +85C Industrial version, the device has been qualified for automotive. Makes life much easier even if not running at +125C.   Oh stopped in at a Houston based customer who is using one of -40C to +85C rated devices, he had the part running at 180C Ambient! I was shocked it was running.

Tom W