Yes, the reference will fade. However, most of our analog sensors have
outputs that fade with the reference voltage. For example the temperature
sensor is a voltage divider. As Vcc fades, the output of the temperature
sensor will fade proportionately.
Jason
-----Original Message-----
From: Shreyas Sadalgi [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, February 28, 2001 8:03 AM
To: [EMAIL PROTECTED]
Subject: [tinyos-users@mm] qn
Hello,
I have a question about the power supply on the mote boards. From the
schematic it looks like the battery (2 AA cells??) powers the board
directly - no regulator... is this correct??
If this is correct, then that means the battery voltage is used to provide
the reference to the internal A/D converter in the AT90S8535. So as the
battery voltage fades over time so too will the A/D reference! This isn't
good - what am I missing? (I don't really need to know - just curious).
And another curiousity - there are two processors in this thing. What
exactly is the purpose of the second one (AT90LS2343)? Looks like it's
managing the reset signal?? Is it doing something else also?
thanks,
shreyas.
____________________________________________________________________________
Shreyas Sadalgi
Dept of Computer Science
DataMan Lab
Rutgers University
Voice : (732) 445-2706 Fax : (732) 445-6722
Web : http://www.cs.rutgers.edu/~sadalgi
____________________________________________________________________________
