W83782D Datasheet, PDF (7/73 Pages) Winbond – MONITORING IC

Priliminary W83782D
WINBOND H/W MONITORING IC
1. GENERAL DESCRIPTION
W83782D is an evolving version of W83782D --- Winbond's most popular hardware status
monitoring IC. The W83782D 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. W83782D provides both ISA and I²C^TM
serial bus interface.
An 8-bit analog-to-digital converter (ADC) was built inside W83782D. The W83782D can
simultaneously monitor 9 analog voltage inputs, 2 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
W83782D provides: 4 PWM (pulse width modulation) outputs for the fan speed control; beep tone
output for warning; SMI#, 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 W83782D 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. Also there are 3
specific pins to provide selectable address setting for application of multiple devices (up to 8 devices)
wired through I²C^TM interface.
Publication Release Date: April 1999
-1-
Revision A1