Hi people,

Well, let me give you more details...

The product we are designing will be located in the engine area near the battery. Because of the main function of this ECU it couldn't be relocated anywhere else.
So the temperature constraint is -40°C...125°C.

I've looked at many manufacturers. I've seen that Atmel has a really interresting range of products fitting my requirement in AVR familly. However, I didn't found any chip with the extended temperature range.
Infineon's uC are interresting but they have no small products allowing to manufacture low cost ECU (some costs less than 5$).

As I've to choose a microcontroller, my feeling is to choose a familly with at least 3 differents chips and 5 will be better :
- small 8-pin, 1-4Kb flash, a few RAM and EEPROM, ADC 10 bits, PWM, about 0.5$ for 1 billion parts
- an intermediate with 8-16Kb flash, 1Kb RAM, 128 EEPROM, ADC 10 bits, PWM, comm.
- a big one with 64K flash, ...

The choice is also concerning development tools I ve to evaluate.

Currently, the choice from my collegue is Motorola 68HC08 or Microchip PICs because it's hugely used in automotive application, the familly range is acceptable.
I don't like too much these products because of the accumulator used for example by Motorola and because PIC are really built-in with old technology using a really specific assembler.
But I've to agree that prices are really competitive...

Well, well, well... not so easy.
I will try to compile some code for different target to know the differences concerning code size and execution time. It's also an important criterion.


Thanks for your comment Lee. I'm trying to update my website regularly. Recently I've included a picture gallery from my area.

In the next days I will add a document I've wrote to introduce the LIN protocol.
Coming soon a page on CAN, ECU automotive power supply, ...

Best regards
Stephane