Hi Siarhei, Thank you for your reply.
I attached a ds18b20 thermal sensor on top of a10 to measure the temperature. And I drew a graph using following formula (temp_data-1447)*/20. It seems that the two line correlate well on the right(minutes after attached) rather than the left(not long after attached). <https://lh3.googleusercontent.com/-VX9j3c6EWnk/U57oUI6gB-I/AAAAAAAABxM/7FfvvskqmzQ/s1600/sensor.png> On Monday, June 16, 2014 4:51:02 PM UTC+8, Siarhei Siamashka wrote: > > On Sun, 15 Jun 2014 22:26:17 -0700 (PDT) > Tong Zhang <[email protected] <javascript:>> wrote: > > > Hello, > > > > I am having trouble with a10 temperature sensor. I have read a10 user > > manual[1] throughly and noticed conflict description about TP registers. > > > > I also followed the routine[2]. The read is around 99C when cpu governor > is > > performance and room temperature is 27C. I doubt whether the temperature > > sensor is calibrated or am I interpreting the data > > correctly[(reg_read-1447)/10]. Or is it possible that the sensor is > > defective? > > > > Anyone has a10 can verify? > > The SoC (TP) temperature sensor was never properly calibrated. And yes, > it's pretty obvious in the case of the A10: > > http://irclog.whitequark.org/linux-sunxi/2014-04-04#7013946; > > We can't be sure about the temperature sensor in A20 either. It could > be also showing wrong temperature (but in a somewhat more believable > range). > > -- > Best regards, > Siarhei Siamashka > -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
