unless you are just out to experiment, I would just use a national LM34 or
an analog devices tmp04F79





-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of ashly Dearden
Sent: Thursday, December 27, 2001 4:29 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: [PIC]: current generator with a PIC


I'm thinking of doing some temperature sensing using the approach that
Dallas and Maxim has with the current source and measuring the voltage
across a diode-connected transistor.  They don't go into alot of detail on
what they are doing...other than around 100uA of current. I assume this must
be a stable current source and just measure the voltage that is generated?
I'd like to do this in just a PIC, since its there doing some other stuff as
well.  The alternate is to use the MAX1805 and interface the I2C to the PIC.
But one chip is better than two...

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