On a neat compact SMD device as 3 stage cold alarm, preset temps. I wish to lower the presets about 3 degrees, powered for 10 years of a small Li cell. Assuming no temp sensor inside the PIC chip, 3 pin SMD marked U1 on the overlay, and code marked AZP18, is probably a temp sensor. No info found with that top code, would anyone know of a similar 3 pin,device type number with a datasheet to perhaps see if possible to fudge/gludgearound this one ? Failing that , an interim measure is to keep it on the top of an otherwise irrelevant itam,a permanently on, mains powered device, that is 2 degrees C above ambient
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7 years ago