What are the AVR28DA128 AVR32DA128 AVR48DA128 AVR64DA128 ??

Go To Last Post
218 posts / 0 new

Pages

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

"Dare to be naïve." - Buckminster Fuller

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 1

"Dare to be naïve." - Buckminster Fuller

Last Edited: Thu. Nov 5, 2020 - 04:08 AM
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

DocJC wrote:
The two level priority interrupt is a step down from the 3 Level interrupt controller in the Xmegas, but is a big step up from a single level controller in the classic AVR Mega and Tiny micros.

Interrupts | Migration from the megaAVR® to AVR® Dx Microcontroller Families

[last paragraph]

Additionally to the CVT [Compact Vector Table] feature, the AVR Dx interrupt controller offers a non-maskable interrupt for critical functions, one selectable high-priority interrupt, and an optional round robin scheduling scheme for normal priority interrupts.

in Migration from the megaAVR® to AVR® Dx Microcontroller Families

or AN3731 - Migration from the megaAVR to AVR Dx Microcontroller Families (PDF)

 

"Dare to be naïve." - Buckminster Fuller

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

The compact vector table is a nice feature for small memory AVRs.

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

The AVR DA datasheet says that VDD and AVDD are internally connected.  What's the point of L200 on AVDD on the AVR128DA48 CURIOSITY NANO if they are not going to do the same on VDD?  Is this just cargo cult PCB design?  Or does it really serve a purpose?

 

Reference: http://ww1.microchip.com/downloa... , page 29 for schematic.

 

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Although internally connected, there may be some impedance between VDD and AVDD that is not stated.

Providing external isolation between the analog and digital domains may improve the noise on those circuits when using analog signals.

   (Or the inductor could just be a cut and paste from earlier designs...)

David

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Maybe the AVDD domain is diode connected to the VDD domain. Consider the MVIO domain on the DB series; it is new to me, so I am mostly clueless, but the AVDD domain would probably need some changes to work like that. I don't even know if ADCs can be done like the MVIO stuff, but who knows? If so, I am confident Microchip will get it to us, but as someone will point out, I should not hold my breath.

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

I appreciate the guesses -- I can guess too -- but I need something a little more definitive.

 

Does anyone from Microchip ever provide definitive answers to questions like this here?  For all its flaws, I can actually count on STMicro to provide useful support on their community forum when needed.

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

I was not under the impression that this was Microchip support? It is more like a group of cranky old people that occasionally talk about AVRs.

 

https://www.microchip.com/en-us/support

 

https://microchipsupport.force.com/s/support-resources?tabName=Community

Last Edited: Sun. Nov 15, 2020 - 04:30 AM
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

If you want an answer from Microchip you need to open a support question on their website.

 

Moderator

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Mobilinkd wrote:
I can guess too

Good to know.

 

Mobilinkd wrote:

but I need something a little more definitive.

 

I measure 3.3 ohm resistance between VCC and AVCC in both directions with a multimeter on an AVR128DA28. This is the best I can do for you... this forum is made up mostly of users of AVRs, we didn't design them...

Last Edited: Sun. Nov 15, 2020 - 03:44 PM
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

ron_sutherland wrote:

I was not under the impression that this was Microchip support? It is more like a group of cranky old people that occasionally talk about AVRs.

 

https://www.microchip.com/en-us/support

 

https://microchipsupport.force.com/s/support-resources?tabName=Community

 

Atmel (now Microchip) points people here for support.  This is how I ended up here looking for infomation on AVR DA parts.

 

https://community.atmel.com/

 

There is no support forums on Microchip's site dedicated to AVR chips.  It's still very much PIC-land.

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

El Tangas wrote:

I measure 3.3 ohm resistance between VCC and AVCC in both directions with a multimeter on an AVR128DA28. This is the best I can do for you... this forum is made up mostly of users of AVRs, we didn't design them...

 

Thank you.  That's quite helpful.  And a bit disappointing for my use case.

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Also wanted to point out that someone else asked where to find the Microchip support forum for AVR chips and was directed here: https://www.microchip.com/forums...

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

DocJC wrote:
... and having 3 internal Op-amps for Analog Front End Signal Conditioning is a great feature.
Integrated OPAMP(s) on PIC® and AVR® MCUs_ - YouTube (3 videos for 15m total)

 

"Dare to be naïve." - Buckminster Fuller

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

"Dare to be naïve." - Buckminster Fuller

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

"Dare to be naïve." - Buckminster Fuller

Pages