Anyone know about this PIC?

[karenhornby]

Your a star Thats almost exactly what I was after as i wont be using anything on the pic other than straight digital inputs and outputs, not using any of the "fancy function"
Its basically going to be 3 inputs that go high a number of outputs that go high or low depending on the inputs, an lcd display connected to it, and a DS18B20 temp sensor.
Oh quick question I'm pretty sure the answer is yes but can you directly substitute a DS18B20 - PAR (parasitic takes it's power from DQ pin) the with a 18B20 just by leaving the other pin unconnected?

[SteveB]

... can you directly substitute a DS18B20 - PAR (parasitic takes it's power from DQ pin) the with a 18B20 just by leaving the other pin unconnected?

Not quite clear on which one you plan to substitude for which, so here is the answer either way:

Yes, you can use a DS18B20 to replace a DS18B20-PAR without problems, just connect Pin 3 (Vdd) to your power supply.

No, you can not use a DS18B20-PAR to replace a DS18B20 unless you modify the circuit. The reason is that the PAR version requires a "strong pullup" during temp conversion. Page 3 "Parasite Power", and figure 2, of the DS18B20-PAR data sheet has the details. If the number of PAR units is small, you can (I have) eliminate the MOSFET they suggest and just hook it directly to a pin to drive it, as the total current is well below the 25ma limit of a single PIC pin.

HTH,
SteveB