ATMEGA2560-16U AND ATMEGA2560-16AU Difference

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#1
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What is the difference between ATMEGA2560-16U AND ATMEGA2560-16AU ?

Is the controller ATMEGA2560-16U had some issue so it was upgraded to ATMEGA2560-16AU?

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Tell me where you found these numbers.  (in particular, the first -- I don't think there is such a thing; what package is it in?)  Have you looked at Ordering Information in the datasheet?

 

-Ax designates the package.  The other letter is the temperature range.

 

Parthadude wrote:
had some issue so it was upgraded

Again, what does the datasheet say about Errata, and chip revision levels?

 

 

You can put lipstick on a pig, but it is still a pig.

I've never met a pig I didn't like, as long as you have some salt and pepper.

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It was from a local vendor near my locality(normally imports from Chinese vendor). It was "ATMEGA2560 16U-TW" in the IC he provided us. 

When I asked for datasheet. This was the link given by him  https://cdn.sparkfun.com/datasheets/Components/General%20IC/2549S.pdf

where I am not sure whether this is the datasheet. 

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I don't see that number there.  Perhaps it is obvious that it is TQFN?  Give a picture of the chip, so that markings can be read.  -TW is Taiwan?  The picture will give us the date code and the manufacturer logo.

 

Perhaps one of the other 'Freaks can help with the modern AVR chip-marking practices.

You can put lipstick on a pig, but it is still a pig.

I've never met a pig I didn't like, as long as you have some salt and pepper.

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This has come up before...links given to Microchip documents.

https://www.avrfreaks.net/forum/...

 

You can put lipstick on a pig, but it is still a pig.

I've never met a pig I didn't like, as long as you have some salt and pepper.

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We use TQFP. I will send you the picture tomorow.

We have used the footprint of Atmega2560-16AU(TQFP) but we soldered ATMEGA2560 16U-TW. 

Does this footprint cause problem to us?

Bootloading doesnt happen or sometimes the IC also burns.

(7/10)boards are success rates for us.

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All versions of the 2560, in a given package, use the same footprint.

So either you have faulty /fake chips or your problem lies with your PCB design.

#1 This forum helps those that help themselves

#2 All grounds are not created equal

#3 How have you proved that your chip is running at xxMHz?

#4 "If you think you need floating point to solve the problem then you don't understand the problem. If you really do need floating point then you have a problem you do not understand." - Heater's ex-boss

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So if the success rate is 7/10 then it must be due to the fake ic or faulty ic.

Let me see through it.

Thank you. 

Last Edited: Sun. Aug 4, 2019 - 10:02 AM
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Parthadude wrote:

So if the success rate is 7/10 then it must be due to the fake ic or faulty ic.

 

Or a problem with your assembly method. Or a problem with your design.

#1 This forum helps those that help themselves

#2 All grounds are not created equal

#3 How have you proved that your chip is running at xxMHz?

#4 "If you think you need floating point to solve the problem then you don't understand the problem. If you really do need floating point then you have a problem you do not understand." - Heater's ex-boss

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Assembly method in the sense your are mentioning the soldering?

I have also attached my design. Please correct me if there is any mistake.

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Parthadude wrote:

Please correct me if there is any mistake.

 

Where to start?...

 

1) Where are your decoupling capacitors on your VCC logic line?

2) Where are your decoupling capacitors on your VCC motor supply line?

3) How do you stop inductive 'kick' voltages on your motor lines feeding back through the diodes in the L393D and onto your logic VCC line?

4) You are using L393D and not L393 aren't you?

 

...let's start with those. 

#1 This forum helps those that help themselves

#2 All grounds are not created equal

#3 How have you proved that your chip is running at xxMHz?

#4 "If you think you need floating point to solve the problem then you don't understand the problem. If you really do need floating point then you have a problem you do not understand." - Heater's ex-boss

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No bypass caps
Aref is tied to vcc
Power supply is most likely suspect.

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Parthadude wrote:

Bootloading doesnt happen...

 

How are you programming the bootloader?

#1 This forum helps those that help themselves

#2 All grounds are not created equal

#3 How have you proved that your chip is running at xxMHz?

#4 "If you think you need floating point to solve the problem then you don't understand the problem. If you really do need floating point then you have a problem you do not understand." - Heater's ex-boss

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For 1 and 2 - Yes, Thats the biggest flop i have made. I did not include it in design.

For 3 - I have used capacitor in the output pin.

For 4 - I have used through hole L293D. 

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May I know why VCC should not be connected to AREF.?

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I use ArduinoUno ICSP Pin to bootload my atmega2560 IC.

I followed Nick Gammon tutorial for bootloading.

https://www.gammon.com.au/bootloader

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Read the datasheet!

220uF is no good as a bypass capacitor!

Last Edited: Sun. Aug 4, 2019 - 01:27 PM
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Yes it is suggesting 330uF or 270uF.

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Parthadude wrote:

May I know why VCC should not be connected to AREF.?

The datasheet says:

As this pin may be connected to an internal voltage source, connecting it to VCC will damage the chip, as noted in the datasheet, connect a 100nf cap to this pin to help filter noise.  If you want your ADC reference to be VCC, then set the internal ref to be AVCC or one of the other references provided as needed.

 

Jim

 

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Thank you so much!!!!

I think this is the failure to my IC.

Will Test and see the result.

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The output capacitor for your power supply is not a bypass cap!

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I have never used a 220uF other than the power supply.

May I know on which part you are referring?

Last Edited: Sun. Aug 4, 2019 - 02:17 PM
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Kartman wrote:
a bypass cap!

is typically a 100nf cap, placed as close to the VCC pin of every chip in the project with the other end connected to a good ground.

Keep leads as short as possible.

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Okay I look for bypass capacitor as suggested in the datasheet.

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Here is the image

 

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