linux-kernel - Re: [lm-sensors] [PATCH 0/2] hwmon: Update coretemp to current Intel processors

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Message-ID: <AANLkTimgz4OF48ryaLAeXmbes786iKBLT0F7_h6ytAeP@mail.gmail.com>
Date:	Tue, 18 May 2010 23:12:51 -0400
From:	Dmitry Gromov <gromovd@...il.com>
To:	Huaxu Wan <huaxu.wan@...ux.intel.com>
Cc:	"Wan, Huaxu" <huaxu.wan@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LM Sensors <lm-sensors@...sensors.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Carsten Emde <C.Emde@...dl.org>
Subject: Re: [lm-sensors] [PATCH 0/2] hwmon: Update coretemp to current Intel 
	processors

Hi!

On Tue, May 18, 2010 at 20:50, Huaxu Wan <huaxu.wan@...ux.intel.com> wrote:
> On 02:45 Tue 18 May, Dmitry Gromov wrote:
>> Hi!
>>
>> And 90C seems to be good for N200 series of Atom CPUs only - I could not
>> find TjMax value published for N330 Dual Core  (quite popular one). Intel
>> only published Tcase for it:
>> http://ark.intel.com/Product.aspx?id=35641
>> So, if for N270 Tcase = TjMax = 90C, then, I'd suggest to use Tcase = 85.2C
>> for N330 TjMax value.
>
> Quoted a sentence from [1], "Unless specified otherwise, all specifications for
> the processor are at TJ = 90°C", I believe the TjMax of 330 is 90C too.
>

Well, that refers for the values in that specific table and entire
document (which I went through as well) does not specify TjMax :(
Similar document for N270 series does specify TjMax explicitly in Table 14:
http://download.intel.com/design/processor/datashts/320032.pdf

Another document, "Thermal and Mechanical Design Guidelines" for Atom
300 series:
http://download.intel.com/design/processor/designex/320530.pdf
specifies Tcase-max = 85.2C
Thinking about this a bit, I think Tcase-max should be lower than
TjMax, which probably is still 90C.
The document itself is a good reading too.

Anyway, thank you very much for your help, Huaxu!

-- 
DG
NJ
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