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Author Topic: Arduino ethernet sheild wiznet chip become too hot!  (Read 1017 times)
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Sulaymaniyah-Kurdistan-Iraq
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I bought a ethernet sheild and when I connected it to my arduino uno and plug it to my computer i notice the wiznet chip on the ethernet sheild became too hot , what is the problem? is it normal?
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Yes, they get quite hot and draw about 200 ma to get there. You're not the first to be concerned.
I quickly disconnected my WIZ810Mj module the first time I fired it up.
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I have four Ethernet shields (with POE) that are used outdoors but not in direct sunlight. I would guess the temperature at noon is roughly 35C (95F) or more. The plastic enclosure gets warm to the touch but they seem to be running fine so far.  smiley-roll-sweat
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Three months later... and two of the four Ethernet shields (with POE) have died. I don't know if it's due to the high temperature and humidity, or if it's because ants got into the POE switch.  smiley-cry
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  I have found information that indicates that POE voltage has a broad range. I think the voltage can be anywhere from 24 to 56 volts. You can by POE power supplies at many different voltage specifications.

 On a side note, Cisco switches with POE put out more voltage than Linksys switches that I have seen.

More voltage = more heat.
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