[SOLVED] Difference between Atmega32 and Atmega32A

I was using Atmega32 and had to replace it. When I replaced it with a new one but Atmega32A
Now it does not work properly as expected at all. I am using port C and D as output port. It seems there is big difference between the two but Atmel says there are minor differences!

Any one having a tip regarding the issue or others are also facing similar problem.

These days only Atmega32A is in market and not Atmega32.

AVR521: Migrating from ATmega32 to ATmega32A
http://www.atmel.com/Images/doc8162.pdf

In order to optimize the manufacturing process and to further reduce current consumption, an optimized version of ATmega32 has been introduced.

The ATmega32A is a functionally identical, drop-in replacement for the ATmega32. All devices are subject to the same qualification process and same set of production tests, but as the manufacturing process is not the same some electrical characteristics differ.

ATmega32 and ATmega32A have separate datasheets. This application note outlines the differences between the two devices and the datasheets. There is also a detailed change log to assist the user at the end of the ATmega32A datasheet. Remember to always use the latest revision of the device datasheet.

Minor differences in typical characteristics are not discussed in this document as long as the low and high limits remain the same. For detailed information about the typical characteristics, see sections “Electrical Characteristics” and “Typical Characteristics” of the device datasheets.

There is no need for any software changes.

Software changes is needed if replacing DIP with TQFP or vice versa.

Check fuse bits. Maybe you just buy some defective uC or bad chinese replica.

:wink:

Most probably it is chinese replica, I tried two Atmega32A and one Atmega16A with same code but it did not work

My friend see this:

ATmega Slugs
https://www.sparkfun.com/news/350

It is strange
Ordinary user like me will never be able to ascertain the reliability of such component.
Thanks!!

No prob I'm glad to help You.

ark5230 said:

I was using Atmega32 and had to replace it. When I replaced it with a new one but Atmega32A
Now it does not work properly as expected at all. I am using port C and D as output port. It seems there is big difference between the two but Atmel says there are minor differences!

Any one having a tip regarding the issue or others are also facing similar problem.

These days only Atmega32A is in market and not Atmega32.

Click to expand...

Try using a lower rated power supply. If the rating of Atmega32A is lower than that of the latter, there's indeed a possibility that higher current supply to the controller could cease the functioning and the micro-controller itself could turn-off to protect the circuit.

For example: Our regular controllers function at 5-9V, whereas the ARM processors require lesser.
Unaware of the fact, initially i attached the same supply and the ARM didn't work.
It has an in-built protection. It worked when I supplied the proper ratings.
Is your circuit even ON-ing and by the way, what are you working on?
I hope I could be of some help to you.
Cheers,
Jai Bathija.

Jai Bathija said:

Try using a lower rated power supply. If the rating of Atmega32A is lower than that of the latter, there's indeed a possibility that higher current supply to the controller could cease the functioning and the micro-controller itself could turn-off to protect the circuit.

Click to expand...

Huh?

The voltage applied and the circuit characteristics determine the amount of current which flows from the power supply, NOT its ratings.

A power supplies ratings specify only the maximum amount of current which CAN be supplied at the specified voltage, NOT how much current will be supplied.

The rating certainly becomes an issue, if the circuit's current requirements exceed that of the power supplies ability to supply.

Or the discussion is in reference to a constant current power supply, which in this case it is NOT.


I believe you must be referring to the power supplies voltage rating, not its current rating.


BigDog

Yes I meant the voltage rating, but does it automatically not mean the current as higher voltage supply would lead to higher current intake?

bigdogguru said:

Huh?

The voltage applied and the circuit characteristics determine the amount of current which flows from the power supply, NOT its ratings.

A power supplies ratings specify only the maximum amount of current which CAN be supplied at the specified voltage, NOT how much current will be supplied.

The rating certainly becomes an issue, if the circuit's current requirements exceed that of the power supplies ability to supply.

Or the discussion is in reference to a constant current power supply, which in this case it is NOT.


I believe you must be referring to the power supplies voltage rating, not its current rating.


BigDog

Click to expand...