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From: Dmitry Osipenko <digetx@gmail.com>
To: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Linus Walleij <linus.walleij@linaro.org>,
	Jonathan Cameron <jic23@kernel.org>,
	Lars-Peter Clausen <lars@metafoo.de>,
	Maxim Schwalm <maxim.schwalm@gmail.com>,
	Svyatoslav Ryhel <clamor95@gmail.com>,
	"linux-iio@vger.kernel.org" <linux-iio@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v1] iio: gyro: mpu3050: Fix reported temperature value
Date: Thu, 22 Apr 2021 20:42:48 +0300	[thread overview]
Message-ID: <18507b2d-0133-190d-724a-4cf038016c17@gmail.com> (raw)
In-Reply-To: <CAHp75VdkpTqGyHSdYYwYQ-PY2c=pDWeB_-gYKsrA2iX7POPWmQ@mail.gmail.com>

22.04.2021 09:46, Andy Shevchenko пишет:
>                     case IIO_TEMP:
>     -                       /* The temperature scaling is (x+23000)/280
>     Celsius */
>     +                       /*
>     +                        * The temperature scaling is (x+23000)/280
>     Celsius,
>     +                        * where 23000 includes room temperature
>     offset of
>     +                        * +35C, 280 is the precision scale and x is
>     the 16-bit
>     +                        * signed integer which corresponds to the
>     temperature
>     +                        * range of -40C..85C.
> 
> 
> 
> Datasheet says typical -30°... also think about the other comment you
> gave, I.e. about temperature of the die itself. Are you suggesting that
> at -40° the die T is also -40°?  Does it have perpetuum mobile ? ;) it
> might dissipate not to much energy, but we don’t know the linearity of
> the curve there.

My understanding that -40C is the minimum temperature which sensor may
report.

Alright, I think the comment could be improved a tad anyways. I'll
prepare v3, thanks.

  parent reply	other threads:[~2021-04-22 17:43 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-22  3:38 [PATCH v2] iio: gyro: mpu3050: Fix reported temperature value Dmitry Osipenko
     [not found] ` <CAHp75VdkpTqGyHSdYYwYQ-PY2c=pDWeB_-gYKsrA2iX7POPWmQ@mail.gmail.com>
2021-04-22 17:42   ` Dmitry Osipenko [this message]
  -- strict thread matches above, loose matches on Subject: below --
2021-04-21 23:48 [PATCH v1] " Dmitry Osipenko
2021-04-22  0:38 ` Linus Walleij
2021-04-22  1:10   ` Dmitry Osipenko
     [not found] ` <CAHp75VcuU_=OxdFo=9cxDtguCTjQ4jQytFzHUb3WoxJgcwDFxA@mail.gmail.com>
2021-04-22  1:20   ` Dmitry Osipenko

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