Controller increases its temperature

stoyanoff · Joined: 20 Jul 2011 Posts: 375

Greetings! I have one dsPIC30F5015 soldered to a board. It works fine, but for few minutes the corpus temperature reaches 40 degree C. I'm stopping it every time when it becomes so hot. This is happening even when the controller does nothing...
Where could be the problem?!
Thanks!

dyeatman · Joined: 06 Sep 2003 Posts: 1934 Location: Norman, OK

Have you tied any I/O lines to Vcc or Vss? Without more info it's a wild guess.
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temtronic · Posted: Sat Apr 19, 2014 8:41 am

bad trace underneath the PIC acting as a heater ?

bad PIC ?

shorted pins ?

hth
jay

stoyanoff · Joined: 20 Jul 2011 Posts: 375

What info do you need?!
I can't find any shorted traces. Vcc and GRD are connected correctly.

I've noticed something - when I stop the PPL there is no heat! My standard program is using HS2_PLL16 and 10MHz quartz = 80MHz oscillator. When I change this to HS - everything is OK.
Any suggestions?!

temtronic · Posted: Sat Apr 19, 2014 10:04 am

bad power supply ? IE: large AC ripple on Vdd ??

'scope will see this....

drawing at straws though....

This PCB..is it a new design, if so, wire up another see what happens ??

hth
jay

stoyanoff · Joined: 20 Jul 2011 Posts: 375

It`s new design, but I ordered only 1. My power supply is done by book. I`m using lm2575 with the appropriate peripheral..

gpsmikey · Joined: 16 Nov 2010 Posts: 588 Location: Kirkland, WA

Floating digital inputs? (like in the linear range??)

mikey
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stoyanoff · Joined: 20 Jul 2011 Posts: 375

It's not from the power supply. I powered the pcb through PicKit 3 - it's the same.
What is the connection between the oscillator setting and the inputs (floating digital inputs)?! I don't have floating inputs. Every input in usage is connected to 4.7k pull-up resistor or to optocoupler`s LED ...

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

This is really a question for the Microchip forum. In fact they have already
discussed it in these threads:

Regarding dsPIC30F6015 IC Heating Problem -
https://www.microchip.com/forums/tm.aspx?m=530353

Overheating while running in XT w/PLL 16,XT w/PLL 8 mode -
http://www.microchip.com/forums/m196508.aspx

dsPIC30F1010 overheating issues -
http://www.microchip.com/forums/m380158.aspx

Question about 30F5015 -
http://www.microchip.com.edgekey.net/forums/m711847.aspx