Hi Ricardo,
Ricardo Wiggers wrote:
Hi!
Has anybody used the internal temperature sensor of the adc10 module?
I want to use it as a thermal protection for a product.
The problem I see is the following: its specification say that the
voltage at 0°C is 986mV+-5%, and that its TC is 3.55mV/°C. From that I
conclude I can have a 0° measure +-14°C. Of course it would need
calibration then, but I can´t find any specs relative to its time
stability. I mean, if I read today 980mV for 0°C, what can I expect to
be read in a couple years from now?
The same question holds for the internal reference votage...
I only tried this earlier this year, so I can't say for certain what
will happen in a couple of years. :-)
As you said, you need to calibrate this, as it varies quite a bit from
device to device (not just from the datasheets, but from my real life
experience). Once you do, it seems to behave well. I didn't have any
problems like drift with supply voltage (unless the voltage falls too
low for the reference to be stable). It is supposed to be stable over
time. So far, I have no reason to doubt this.
Regards,
Steve
