From: Guenter Roeck <guenter.roeck@ericsson.com>
To: lm-sensors@vger.kernel.org
Subject: Re: [lm-sensors] Intel DH55HC Sensors
Date: Thu, 15 Mar 2012 03:36:55 +0000 [thread overview]
Message-ID: <20120315033655.GB9854@ericsson.com> (raw)
In-Reply-To: <20120314143659.0c1cf55d@ritchie.cs.ubc.ca>
On Wed, Mar 14, 2012 at 05:36:59PM -0400, Christopher Head wrote:
> Hi,
> I'm trying to get my DH55HC's sensors working. Detection indicates
> w83627dhg-isa-0a10 as the device. According to the wiki at
> <http://lm-sensors.org/wiki/VoltageLabelsAndScaling>, this chip is
> capable of reading 8 mV/LSb. Here's the problem: the division ratio
> doesn't make sense! In the BIOS, I observed the following values on the
> 12 V rail:
>
> 11.828
> 11.844
> 11.859
>
> The difference between these values is 15 or 16 mV. But 12 V / 0.016
> V/LSb = 750 LSb! Since these sensor chips don't read raw values above
> 255, how in the world am I getting 16 mV resolution on a 12 V input?
> I'm seeing similar results on my 5 V rail, which returns values just 2
> mV apart in the BIOS, and on my so-called "Memory V_SM" rail (2 mV) and
> "+Vccp" rail (differences as small as 1 mV being displayed).
>
> Any ideas?
>
The BIOS may get its voltages through HECI, which uses a different set of ADCs
built into the H55 PCH.
Guenter
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next prev parent reply other threads:[~2012-03-15 3:36 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-14 21:36 [lm-sensors] Intel DH55HC Sensors Christopher Head
2012-03-15 3:36 ` Guenter Roeck [this message]
2012-03-19 21:01 ` Christopher Head
2012-03-19 21:46 ` Guenter Roeck
2012-03-19 23:18 ` Christopher Head
2012-03-20 3:20 ` Guenter Roeck
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