Im using a 16F18346 20 pin in an SOIC package in a new project. everything works fine on the breadboards but now that I have the PCB and built it up for no apparent reason the chip begins to consume about 350 - 400mA and then burns up. If I didn't know better I would swear they were low power versions (16L18346) it's the only sensible conclusion I can think of.
I have disconnected all I/O ports to the device.
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Most definitely, been over the PCB like a very nasty rash.
I'm beginning to conclude that it is something to do with a 74HCT14 a hex inverter with Schmitt-trigger inputs used to interface a couple of analogue inputs. Jury is still out on this.
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Im using a 16F18346 20 pin in an SOIC package in a new project. everything works fine on the breadboards but now that I have the PCB and built it up for no apparent reason the chip begins to consume about 350 - 400mA and then burns up. If I didn't know better I would swear they were low power versions (16L18346) it's the only sensible conclusion I can think of.
I have disconnected all I/O ports to the device.
Sounds like a dead short. That current will kill a chip.
I have many of those chips working. A really dumb question- have you checked the pcb for deadshorts?
Most definitely, been over the PCB like a very nasty rash.
I'm beginning to conclude that it is something to do with a 74HCT14 a hex inverter with Schmitt-trigger inputs used to interface a couple of analogue inputs. Jury is still out on this.