From mboxrd@z Thu Jan 1 00:00:00 1970 From: Guenter Roeck Date: Thu, 15 Mar 2012 03:36:55 +0000 Subject: Re: [lm-sensors] Intel DH55HC Sensors Message-Id: <20120315033655.GB9854@ericsson.com> List-Id: References: <20120314143659.0c1cf55d@ritchie.cs.ubc.ca> In-Reply-To: <20120314143659.0c1cf55d@ritchie.cs.ubc.ca> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: lm-sensors@vger.kernel.org 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 > , 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 _______________________________________________ lm-sensors mailing list lm-sensors@lm-sensors.org http://lists.lm-sensors.org/mailman/listinfo/lm-sensors