W83627F Information Storage Devices, Inc, W83627F Datasheet - Page 26

• Manufacturer Part Number: W83627F
• Description: LPC Interface I/o Plus Kbc, Game Port, Midi Port
• Manufacturer: Information Storage Devices, Inc

2. HARDWARE MONITOR
2.1 General Description
The W83627HF can be used to monitor several critical hardware parameters of the system, including
power supply voltages, fan speeds, and temperatures, which are very important for a high-end computer
system to work stable and properly. W83627HF provides both LPC and I
access hardware .
An 8-bit analog-to-digital converter (ADC) was built inside W83627HF.
simultaneously monitor 9 analog voltage inputs, 3 fan tachometer inputs, 3 remote temperature, one
case-open detection signal.
2N3904 NPN-type transistors, or directly from Intel
W83627HF provides: 2 PWM (pulse width modulation) outputs for the fan speed control; beep tone
output for warning; SMI#(through serial IRQ) , OVT#, GPO# signals for system protection events.
Through the application software or BIOS, the users can read all the monitored parameters of system
from time to time. And a pop-up warning can be also activated when the monitored item was out of the
proper/preset range. The application software could be Winbond's Hardware Doctor
(LanDesk Client Management), or other management application software. Also the users can set up
the upper and lower limits (alarm thresholds) of these monitored parameters and to activate one
programmable and maskable interrupts. An optional beep tone could be used as warning signal when
the monitored parameters is out of the preset range.
Additionally, 5 VID inputs are provided to read the VID of CPU (i.e. Pentium
provide the Vcore voltage correction automatically.
feature: early stage (before BIOS was loaded) beep warning. This is to detect if the fatal elements
present --- Vcore or +3.3V voltage fail, and the system can not be boomed up.
2.2 Access Interface
The W83627HF provides two interface for microprocessor to read/write hardware monitor internal
registers.
The first interface uses LPC Bus to access which the ports of low byte (bit2~bit0) are defined in the port
5h and 6h. The other higher bits of these ports is set by W83627HF itself. The general decoded address
is set to port 295h and port 296h. These two ports are described as following:
Port 295h: Index port.
Port 296h: Data port.
The register structure is showed as the Figure 2.1
2.2.1 LPC interface
The remote temperature sensing can be performed by thermistors, or
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Deschutes CPU thermal diode output. Also the
Also W83627HF uniquely p rovides an optional
Publication Release Date:November 2002
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2
C
W83627HF/F
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II) if applicable. This is to
serial bus interface to
The W83627HF can
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, or Intel
Revision 2.0
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LDCM