Hello everyone, please find enclosed my configuration file for Foxconn 2A8Ch motherboard. All Compaq 500B MT (Product No. WB741EA#ABZ) are equipped with this motherboard. I had some problems in writing it, because neither the motherboard nor the personal computer are well-documented; so it likely needs further tweaking. However, I hope that it may be useful to someone. Thanks in advance for your time, Michele
# Libsensors configuration file for:
#
# Compaq 500B MT (Product No. WB741EA#ABZ)
# Manufacturer: Hewlett-Packard
# Product Name: Compaq 500B Microtower
# SKU Number: WB741EA#ABZ
# Family: 103C_53307F
#
# Motherboard Information
# Manufacturer: FOXCONN
# Product Name: 2A8Ch
#
# CPU Information:
# Version: Pentium(R) Dual-Core CPU E5400 @ 2.70GHz
# Voltage: 1.3 V
# External Clock: 800 MHz
# Max Speed: 2700 MHz
# Socket: LGA775
#
# Chips used for system monitoring:
# - On-die Digital Thermal Sensor (DTS) in CPU Cores
# - IT8712F on the motherboard
#
chip "it87-*" "it8712-*" "it8720-*"
# Labeling CPU cores temp monitors
label temp1 "Core 0 Temp"
label temp2 "Core 1 Temp"
label temp3 " M/B Temp"
# Labeling fans
label fan1 "CPU Fan"
label fan2 "M/B Fan"
label fan3 "P/S Fan"
# Labeling voltage monitors
label in0 "VCore 1"
label in1 "VCore 2"
label in2 "+3.3V"
label in3 "+5V"
label in4 "+12V"
label in5 "-12V"
label in6 "-5V"
label in7 "Stdby"
# Setting voltage ranges
# For in0 and in1 (CPU cores), the range values are inferred by the web page
# about specs of Intel® Pentium® Processor E5400 (http://ark.intel.com/products/40478/)
set in0_min 0.85
set in0_max 1.3625
set in1_min 0.85
set in1_max 1.3625
# For all remaining values, we simply set a tolerance of 0.5%
# because we lack the specs page for the motherboard Foxconn 2A8Ch
set in2_min 3.3 * 0.95
set in2_max 3.3 * 1.05
set in3_min 5.0 * 0.95
set in3_max 5.0 * 1.05
set in4_min 12 * 0.95
set in4_max 12 * 1.05
set in5_min -12 * 1.05
set in5_max -12 * 0.95
set in6_min -5 * 1.05
set in6_max -5 * 0.95
set in7_min 5 * 0.95
set in7_max 5 * 1.05
# Setting lowest speed for motherboard fan
set fan2_min 600
# vid not monitored by IT8705F
ignore cpu0_vid
# Intel CPU Cores are better monitored by coretemp module
# so here we're going to ignore them
ignore temp1
ignore temp2
# Ignore Power Supply Fan: we haven't a PSU so smart!
# Comment the following 2 lines if you have a smart PSU
ignore fan3
ignore temp3
# For the negative voltage values, the chip uses two external resistor for scaling, but one is
# tied to a positive reference voltage. See ITE8712F datasheet (V0.81)
# downloaded at: http://pdf1.alldatasheet.com/datasheet-pdf/view/143783/ETC1/IT8712F.html
#
# Informations below are just extracted by this datasheet:
#
# **************************************************************************************************************
# The Environment Controller (EC), built in the IT8712F, includes eight voltage inputs, three temperature sensor
# inputs, three FAN Tachometer inputs, and three sets of advanced FAN Controllers. The EC monitors the
# hardware environment and implements environmental control for personal computers.
# The IT8712F contains an 8-bit ADC (Analog-to-Digital Converter) which is responsible for monitoring the
# voltages and temperatures. The ADC converts the analog inputs, ranging from 0V to 4.096V, to 8-bit digital
# bytes. Thanks to the additional external components, the analog inputs are able to monitor different voltage
# ranges, in addition to monitoring the fixed input range of 0V to 4.096V. Through the external thermistors, the
# temperature sensor inputs can be converted to 8-bit digital bytes, enabling the sensor inputs, and monitoring
# the temperature around the thermistors or thermal diode. A built-in ROM is also provided to adjust the non-
# linear characteristics of thermistors.
# FAN Tachometer inputs are digital inputs with an acceptable input range of 0V to 5V, and are responsible for
# measuring the FAN’s Tachometer pulse periods. FAN_TAC1 and FAN_TAC2 include programmable divisors,
# and can be used to measure different fan speed ranges. FAN_TAC3 also includes programmable divisors, but
# can be used to measure two fan speed ranges only.
# The EC of the IT8712F provides multiple internal registers and an interrupt generator for programmers to
# monitor the environment and control the FANs. Both the LPC Bus and Serial Bus interfaces are supported to
# accommodate the needs for various applications.
#
# The 8-bit ADC has a 16mV LSB, with a 0V to 4.096V input range. The 2.5V and 3.3V supplies of PC
# applications can be directly connected to the inputs. The 5V and 12V inputs should be divided into the
# acceptable range. When the divided circuit is used to measure the positive voltage, the recommended range
# for Ra and Rb is from 10KΩ to 100KΩ. The negative voltage can be measured by the same divider unless the
# divider is connected to VREF (constant voltage, 4.096V), not ground. The temperature measurement system
# of the EC converts the voltage of the TMPINs to 8-bit two’s-complement. The system also includes an OP
# amp providing a constant voltage. It also additionally includes an external thermistor, a constant resistance,
# the ADC and a conversion table ROM.
# **************************************************************************************************************
#
# Formulas used in computing:
# Vs = (1 + Rin/Rf) * Vin - (Rin/Rf) * Vref.
# Vref = 4.096 volts, Vin is voltage measured, Vs is actual voltage.
# 1 LSB = 16 mV
compute in0 @ * (10/16), @ / (10/16)
compute in1 @ * (10/16), @ / (10/16)
compute in2 @ * (25/16), @ / (25/16)
compute in3 ((6.8/10)+1)*@ , @/((6.8/10)+1)
compute in4 ((75/16) +1)*@ , @/((75/16) +1)
# The next two are negative voltages (-12 and -5).
# The following formulas must be used. Unfortunately the datasheet
# does not give recommendations for Rin and Rf (only Vref = 4.096V)
# so we are forced to guess them
#
# Formula:
# actual V = (Vmeasured * (1 + Rin/Rf)) - (Vref * (Rin/Rf))
# For -12V input use Rin/Rf ~= 7.4
# For -5V input use Rin/Rf ~= 3.7
# Elsewhere use Rin/Rf ~= 6.8
#
# Then you can convert the forumula to a standard form like:
compute in5 (8.4 * @) - 30.31 , (@ + 30.31) / 8.4
compute in6 (4.7 * @) - 15.16 , (@ + 15.16) / 4.7
# Stand-by voltage input computation
compute in7 ((6.8/10)+1)*@ , @/((6.8/10)+1)
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