W83627HF Datasheet, PDF (105/185 Pages) Winbond – WINBOND I/O

W83627HF/F
PRELIMINARY
11. HARDWARE MONITOR
11.1 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 I²C^TM serial bus
interface to access hardware .
An 8-bit analog-to-digital converter (ADC) was built inside W83627HF. The W83627HF can
simultaneously monitor 9 analog voltage inputs, 3 fan tachometer inputs, 3 remote temperature, one
case-open detection signal. The remote temperature sensing can be performed by thermistors, or
2N3904 NPN-type transistors, or directly from Intel^TM Deschutes CPU thermal diode output. Also the
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^TM, or Intel^TM
LDCM (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^TM II) if applicable. This is
to provide the Vcore voltage correction automatically. Also W83627HF uniquely provides an optional
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.
11.2 Access Interface
The W83627HF provides two interface for microprocessor to read/write hardware monitor internal
registers.
11.2.1 LPC interface
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 11.1
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Publication Release Date: Jul 1999
Revision 0.53