Helpful ReplyHot!PIC32MZ - very hot!!

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TimH
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2017/09/11 10:28:46 (permalink)
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PIC32MZ - very hot!!

I'm evaluating a PIC32MZ on a DM320008 with MEB-II and am really surprised and alarmed at how hot the device is. The case temperature is 140F/60C with the processor not doing much.
 
Is that normal?
#1
KTrenholm
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Re: PIC32MZ - very hot!! 2017/09/11 10:54:16 (permalink)
3 (2)
Not normal.  You'll probably want to to take a closer look at your circuit and determine if anything is shorted where it shouldn't be.  Also check for possible outputs that might be fighting.  Anything that would draw current where it shouldn't be.
 
[EDIT]
Really that's normal for that part?  That's really warm.
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Larry.Standage
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Re: PIC32MZ - very hot!! 2017/09/11 10:54:20 (permalink)
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Yes. This part is a very warm one. I've put heat sinks on mine.
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NKurzman
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Re: PIC32MZ - very hot!! 2017/09/11 10:59:54 (permalink)
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PIC32MZ what?  There are dozens  My EFH is fine.  is yours a DA?
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TimH
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Re: PIC32MZ - very hot!! 2017/09/11 11:23:03 (permalink)
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Sorry for incomplete info. It's an eval board, DM32008, which has the PIC32MZ2064DAA288 on it.
 
If it's really normal for it to be that hot and to need heatsinks...eek!
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mrpackethead
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Re: PIC32MZ - very hot!! 2017/09/11 11:49:08 (permalink)
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the datasheet for that part says its range is -40 to 85C..Something is very wrong with it..  
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TimH
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Re: PIC32MZ - very hot!! 2017/09/11 11:50:42 (permalink)
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mrpackethead
the datasheet for that part says its range is -40 to 85C..Something is very wrong with it..  


And if so, I don't want to be designing it in!!
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Skaptor
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Re: PIC32MZ - very hot!! 2017/09/11 12:48:00 (permalink)
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The PIC32MZDA heating at ~60 degrees is normal, as said in the MASTERs conference GFX class

Try adding more delay, see if it fixes it
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TimH
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Re: PIC32MZ - very hot!! 2017/09/11 12:52:07 (permalink)
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Well, to be blunt - that's useless for my application. Put that in a sealed box and everything will cook - can't use fans, or heat pipes or anything like that. A heatsink would be irrelevant.
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KTrenholm
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Re: PIC32MZ - very hot!! 2017/09/11 12:54:29 (permalink)
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Skaptor
The PIC32MZDA heating at ~60 degrees is normal, as said in the MASTERs conference GFX class




That's a spicy PIC.
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TimH
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Re: PIC32MZ - very hot!! 2017/09/11 13:17:40 (permalink)
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It's spicy for sure - too spicy for me I fear. And MHGC V2.04 is quirky to say the least - sad to say I am rapidly concluding that I may not be able to use this processor.
[edit - toned down my response after some slightly better success using MHC and MGC]
 
 
post edited by TimH - 2017/09/11 14:54:12
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NKurzman
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Re: PIC32MZ - very hot!! 2017/09/11 15:07:37 (permalink)
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Depending on you r Project you have the option of LCC (software timed Graphics) or an external Graphics controller IC.  The DA chips are only one choice.
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TimH
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Re: PIC32MZ - very hot!! 2017/09/12 01:27:38 (permalink)
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NKurzman
Depending on you r Project you have the option of LCC (software timed Graphics) or an external Graphics controller IC.  The DA chips are only one choice.


Thanks for the suggestion - I'll look into these options (if you have recommendations I will take them on board).
 
I like much that Harmony has to offer, and if the addition of a chip for a few $'s solves the heat issue and still allows me to use graphics composer and the other "one click" support for TCP/IP/Wi-Fi/Bluetooth/etc. then this could be a winner.
 
I could still use the SAM9X35 as that has a controller built in, but I think this will be more work for me to upgrade from the earlier SAM9261 as I need to add so many more interfaces now.
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mrpackethead
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Re: PIC32MZ - very hot!! 2017/09/12 01:45:50 (permalink)
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@timH, have you actually finished a real project in Harmony?   Harmony is what the marketing folks call it.. The rest of us call it 
cacophony 
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TimH
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Re: PIC32MZ - very hot!! 2017/09/12 01:50:59 (permalink)
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mrpackethead
@timH, have you actually finished a real project in Harmony?   Harmony is what the marketing folks call it.. The rest of us call it 
cacophony
 


No, just playing at the moment. I have created my own trial project, and thrown together some screens which (after some pain) do work as expected.
 
I appreciate that there will undoubtedly be pain along the way - all projects have their fair share of pain of course - and I am trying to balance that with the pain I worry will be there if I use the SAM9X35. But my next step is to run up the SAM9X35 eval board and run its tools and demo code and, who knows, I may be pleasantly surprised.
 
It is fair to say that if adding in the hardware I need does not go smoothly with Harmony then there does seem little point "jumping ship" to the PIC's. 
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NKurzman
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Re: PIC32MZ - very hot!! 2017/09/12 06:15:25 (permalink)
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What size display are you looking at?
The lcc is good if you are good for 272*480 or less. That will use half the ram in the chip. It will also steal a chunk o performance updating the display. Harmony supports a few controllers, assuming you do not want to write your own driver. You would need to see if any suit you needs.
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TimH
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Re: PIC32MZ - very hot!! 2017/09/12 06:19:37 (permalink)
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5" tft, 800x480 so don't think lcc is the way to go. I will look at the supported controllers and go from there. I very much appreciate you taking the time to assist me here :)
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friesen
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Re: PIC32MZ - very hot!! 2017/09/12 09:00:00 (permalink)
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My custom MZ2064DAH176 board doesn't run that hot, usually slightly warm to the touch.
 
Aside from not having an FPU, the DA series can really burn through code. They have the 64 bit mult unit, plus ddr ram, its really nice not being so ram constrained.  
 
Maybe the external DDR interface uses too much power for some reason.

Erik Friesen
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TimH
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Re: PIC32MZ - very hot!! 2017/09/12 09:44:12 (permalink)
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friesen
My custom MZ2064DAH176 board doesn't run that hot, usually slightly warm to the touch.
 
Aside from not having an FPU, the DA series can really burn through code. They have the 64 bit mult unit, plus ddr ram, its really nice not being so ram constrained.  
 
Maybe the external DDR interface uses too much power for some reason.


Interesting. My current design with a 320x240 LCD and many many pages of RLE bitmaps has 2Mbyte external DRAM (and a 160k internal SRAM) and I've not had problems. 
 
Going to 800x480 I know I'll need much more memory so thought the 128M of the DM320008 would be a good choice. Maybe the internal 32Mbyte would be more than enough after all - I'll get the appropriate DM module and try that and see how hot it runs.
 
The more I play with the eval setup the more inclined I am to use this family as I really like a lot of what it has to offer.
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katela
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Re: PIC32MZ - very hot!! 2017/09/12 10:41:34 (permalink)
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Larry.Standage
Yes. This part is a very warm one. I've put heat sinks on mine.


a heat sink? Wow that's really interesting. grin: grin

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