Interfacing a Picmicro with a TC620 temp sensor

[Pj]

I'm trying to run some tests with the TC620. I want to pole the high
out, low out and control using porta pins 0,1 and 2 of a pic 16f84f.
All I get is garbage. Mircrochip says connect to the interups. My
question is can the 620 interface directly with the pic, or do I need
other components between the two chips? If so, why? I have the notes
on the TC4469 quad CMOS driver, but I want to do some simple testing
before complicating things. Any help will be appreciated.

 

[Fred Bloggs]

I'm trying to run some tests with the TC620. I want to pole the high
out, low out and control using porta pins 0,1 and 2 of a pic 16f84f.
All I get is garbage. Mircrochip says connect to the interups. My
question is can the 620 interface directly with the pic, or do I need
other components between the two chips? If so, why? I have the notes
on the TC4469 quad CMOS driver, but I want to do some simple testing
before complicating things. Any help will be appreciated.

Looks like it has tons of drive. Maybe it's something else:
"Care must be taken to ensure the LOW SET programming
resistor is a smaller value than the HIGH SET programming
resistor. Failure to do this will result in erroneous
operation of the CONTROL output.
Care must also be taken to ensure the LOW SET
temperature setting is at least 5°C lower than the HIGH SET
temperature setting. That is:
LOW SET £ HIGH SET – 5°C"
Looks like about the only way to screw things up , assuming you know how
to identify pin numbers correctly...