Temperature protection

T

thunderace7

New Member
Hi. Does the Picaxe 28x2 have temperature protection? I have used one to make a gaming cloud for my grandson and it has been running ok for several months. tThe other day he had it on continually all day and it shut itself off. I went down to have a look at it and it was working perfectly. I can only guess that it shut down due to overtemperature but I dont know whether it was the Picaxe or possibly the power supply. Does the Picaxe have overtemperature protection?
Thanks.
 
No, the PIC chips the PICAXE are based on have no temperature protection.

Further, providing you're giving the chip the correct amount of Voltage, and you're not drawing more current than the chip spec sheets call out, you will never feel the chip even get warm. An IR camera could probably not a slight change in temperature, but these PIC chips don't head up in any human-applicable way. I'd look at your power supply, or other components in the circuit.
 
Hi,

Agreed, there doesn't appear to be any reference to temperature protection in the Data Sheet(s). But the chips may have some inherent protection in that the Output FETs aren't vey beefy, so even short-circuit currents can be quite modest.

However, the M2 base PIC chips do have a "Temperature Indicator Module" although the design (IMHO) is not at all User Friendly, and any form of calibration is almost totally non-existent. Hence the almost hilarious comment in the Application Note (AN2092) that "Generally this equation will produce an uncalibrated temperature value that is within 100°C of the actual temperature." So there is a slight possibility that some "User" Program protection might be applied, but I'm not aware that anybody has even tried.

Cheers, Alan.
 
Thank you for your replies. I suspect the power supply was playing up but I don't know why because I oversized it quite considerably. It is a 9v 6A supply and is only running at about 2A. It has been working OK since Christmas so maybe just some kind of glitch?
 
Hard to say ... it's possible the power supply itself overheated? Perhaps it *does* have a temperature protection of some kind?

Otherwise, intermittent problems are some of the hardest to chase down ... check connections ... bang things around, see if you see any glitches, etc.
 
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