W83627EHF Datasheet, PDF (29/141 Pages) Winbond – evolving product from Winbonds most popular I/O family

W83627EHF/EF, W83627EHG/EG
6. HARDWARE MONITOR
6.1 General Description
The W83627EHF/EHG 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. W83627EHF/EHG provides LPC interface to
access hardware.
An 8-bit analog-to-digital converter (ADC) was built inside W83627EHF/EHG. The W83627EHF/EHG
can simultaneously monitor 6 analog voltage inputs (intrinsic monitor VBAT,3VSB, 3VCC,& AVCC
power), 5 fan tachometer inputs, 3 remote temperature, one case-open detection signal. The remote
temperature sensing can be performed by thermistors or directly from Intel^TM Deschutes CPU thermal
diode output. Also the W83627EHF/EHG provides: 4 PWM (pulse width modulation) outputs for the
fan speed control or 4 DCFAN outputs for the fan speed control; beep tone output for warning;
HM_SMI#(through SERIRQ or OVT# pin) , OVT# 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 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 masked interrupts.
An optional beep tone could be used as warning signals when the monitored parameters are out of the
preset range.
6.2 Access Interface
W83627EHF/EHG provides two interface for microprocessor to read/write hardware monitor internal
registers.
6.2.1 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 W83627EHF/EHG 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 6.1
Publication Release Date: January 18, 2006
-23-
Revision 1.0