TI TMP101 driver

Ben Dooks ben at fluff.org.uk
Sun Feb 20 00:17:13 CET 2005


On Sat, Feb 19, 2005 at 05:46:19PM +0100, Jean Delvare wrote:
> Hi Ben, hi Mark,
> 
> > > isn't this chip compatible with the LM75 and its driver?
> > > what's different about it if anything?
> > 
> > configuration register is different, the temperature
> > comparison is also different (tmp101 has low/high range)
> 
> Configuration is extended but compatible. Your driver doesn't seem to
> make use of the extra configuration bits (only raises OS/ALERT, which is
> already set by default).

The driver also has resolution control.
 
> I also see no difference in the comparison mechanism. Tlow and Thigh are
> misnomers, if you look at the output transfer functions diagrams (page 6
> of the datasheet) you see that it really is a high limit with an
> hysteresis, just like the LM75 has.
> 
> I agree with Mark, your driver is essentially redundant with the lm75
> driver. I invite you to test the lm75 driver on your device. You might
> need to use the force parameter (the detection method is quite tricky)
> but otherwise I'd expect it to work just fine. If it does, we might
> simply need to tweak the detection function (once more) to recognize the
> TMP101.

I'll try and check it
 
> See this thread for a previous discussion on this same topic:
> http://archives.andrew.net.au/lm-sensors/msg26681.html
> 
> (Side question, where do you have such a chip? Seems to be quite rarely
> used.)

All new boards by Simtec Electronics... the EB2410ITX and at least one
custom board for a client.

-- 
Ben (ben at fluff.org, http://www.fluff.org/)

  'a smiley only costs 4 bytes'



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