What is device ID 1E9702 for Atmega128 ?

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Hello All,

I've bought 10 pcs Atmega128A AU 1902 (on label) chips. 

After soldering and starting up one of them I found this ID:

 

 

Atmega128 datasheet page 253 tells me there is only one manufacturer listed with ID 1F.

What is the matter. Do I have some problems with these chips?

 

Ellen

 

 

 

 

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Last Edited: Wed. Feb 12, 2020 - 12:45 PM
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You normally use the regular Signature bytes e.g 1E 97 02

 

Look at p289 in your datasheet.

 

The JTAG ID has a different value.   I am aware of JTAG ID but have never used it.  

If you go further in the AS7.0 Programming Screen you will see "Device information"

 

I presume that JTAG Debug software might use the JTAG ID.   From memory,  most devices have a very different JTAG ID versus Device Signature.   It is confusing to see such "similar" values.

 

David.

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in the document you linked in #1

 

(oh just realised this is the page 289 David just referred to!)

Last Edited: Wed. Feb 12, 2020 - 11:51 AM
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EllenR wrote:
Atmega128A

So why are we in the XMega forum ? * Not any more. *

 

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Last Edited: Wed. Feb 12, 2020 - 12:17 PM
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david.prentice wrote:
If you go further in the AS7.0 Programming Screen you will see "Device information"

 

Screen Device information. 

 

It's OK, the same signature ... & page 289 ! Thank You

 

 

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I was intrigued.   So I read the Device Info for my ATmega128 board.

Device signature    0x1E9702

JTAG id    0xC970203F
Revision    M

 

I suspect that your device(s) are younger than mine.

I was surprised to see Revision F for date code 1902 when mine is Revision M for 0639 (year 2006, week 39 )

 

David.

Last Edited: Wed. Feb 12, 2020 - 01:07 PM
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david.prentice wrote:

I suspect that your device(s) are younger than mine.

I was surprised to see Revision F for date code 1902 when mine is Revision M for 0639 (year 2006, week 39 )

 

My device: Date of purchase 03/2019, firmware 1.29 actually updated. 

 

Ellen