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Topic: Immense heat with the new Ethernet Shield (Read 2150 times) previous topic - next topic


Sep 03, 2010, 01:52 pm Last Edit: Sep 03, 2010, 01:53 pm by pedrotome Reason: 1
Hi, today I connected my brand new Ethernet Shield to my Duemilanove and, to my surprise, the shield grew very hot very fast!
The hot part is the WIZnet million-pin IC.

I grabbed my Digital Thermometer and, to my surprise, it was 49ºC (120ºF)!!!

Is it supposed to be this hot? The only thing it's connected to is the computer - through USB!!!

I'm kinda freaking out, guys, I don't wanna blow up my shield... It was NOT cheap. :/



No, it came fully assembled. I don't even think it's sold as a kit...
Look at it: who would want to solder this themselves? link!


Sep 03, 2010, 09:42 pm Last Edit: Sep 04, 2010, 08:56 am by davekw7x Reason: 1
I have two of the original Ethernet Shields (same Wiznet chip).  They run a "little" warm.  My uncalibrated fingertip says the surface of the IC package is probably somewhere around 40-41C.  Not hot enough to make me uncomfortable.

This is with or without connection to my Ethernet LAN.




Same here, my old ethernet style shield runs 'warm' to the touch.  The wiznet is a greedy little begger and consumes about 150 mA, at 5v thats 0.75 W, about right to mildly warm the chip. Again, my fingers are uncalibrated ;)


Fingers are quite well - with a little bit of practice you can distinguish: below 10, around 20, 30, 35, 40 , around 50 centigrades.. Also 80 degrees is simple as this is where proteins co-aggulate....


Mine got around 50°C too. But still lives.


Sep 04, 2010, 02:07 pm Last Edit: Sep 04, 2010, 02:07 pm by pedrotome Reason: 1
Thanks guys.
I thought there was actually something really wrong... Oh well... ::)

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