the objective is simple need to sense two voltages level and give output( for eg if we are considering WIF sensors, i.e water is present (for some voltage) else diesel is present(for another voltage)
an comparator function.
in addition to that and low voltage detection for initial ECU check is required.
any suggestion which microcontroller IC will be suitable?
earlier used
Renesas and NXP mc series microcontroller ics.

 

PIC16F506. It has internal voltage reference.

 

i couldnt find the attachment with just those keywords.
could you attach the datasheet?
does it have low voltage detection(LVD) for initial ECU checking?

 

That is my mistake, it is PIC16F506. If this one does not suit you, try PIC16F690.

PIC16F506:
http://ww1.microchip.com/downloads/en/DeviceDoc/41268D.pdf

PIC16F690:
http://ww1.microchip.com/downloads/en/devicedoc/41262A.pdf

 

thanks for the suggestion im going through the datasheets.
could you just explain the initial LOW voltage detection(i.e) while connected with ECU how to give some output at intial irrespective of the levels of voltages which we use for comparators.
which will help in detecting if any short circuit of internal problem if that initial output is not recieved
can you understand my requirement?

 

What I understand is that you want to start the ECU, give some voltage to the MCU and if that voltage does not arrive, decide there is a fault (CAN similar method)?

 

yes ofcourse....while receiving signal from ECU, there must be an ackowledgement from MCU, that voltage is arrived, for a very small time max of 10-30ms.
after that it shall proceed for back main comparator function (for eg if u we consider WIF sensor certain voltage for water & certain voltage for diesel.)

 

That is easily done. It is a matter of programming, if you want, you can use CAN with PIC16F690, I believe the datasheet mentions about CAN.

You can do it with a simple TTL logic or CAN or RS232 or I2C, however you want. Since most ECUs now a days use CAN, I suggest checking the datasheet for the CAN options.

 

This is one of the features:
EUSART LIN 2.0 Compatible

 

Okay thanks a lot.
I'm reading the functionalities and cost and size parameters right now.
could you help me in explaining how the CAN or TTL logic or other can be performed with this MCU for this initial checking function. with an example or similar kind of functionality check performed with MCU.
I'm new to this will be helpful and better to learn.

 

What do you know about voltage level logic?

 

For simple consideration, maybe high as 5v or low as 0v something like.TTL gate circuits cannot output such perfect voltage levels, and are designed to accept “high” and “low” signals deviating substantially from these ideal values. like logic circuits to perform voltage level switching na!?

 

You have a lot of reading to do, before you make ECUs.

 

I'm not into making ECU actually....
working on WIF sensors. part module has been changed and functionality with microcontroller, so trying to fit the logic and requirement with the microcontroller...
just the project is MCU to interact with ECU and should give acknowledgement. could it be done just by giving interrupt enabling a single for that minute duration and then disabling and continuing with the logic