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W83781D Datasheet(PDF) 5 Page - Winbond

Part # W83781D
Description  H/W MONITORING IC
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Manufacturer  WINBOND [Winbond]
Direct Link  http://www.winbond.com
Logo WINBOND - Winbond

W83781D Datasheet(HTML) 5 Page - Winbond

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Publication Release Date: April 14, 2005
- 1 -
Revision 2.0
The W83781D/G is a hardware monitoring IC for personal computers, server computers, or
microprocessor based systems. W83781D/G 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 stablely and properly. W83781D provides both
ISA and I
2CTM serial bus interface.
A 8-bit analog-to-digital converter (ADC) was built inside W83781D/G. The W83781D/G can monitor 3
external thermistor temperature sensors, 5 positive analog voltage inputs, two inverting inputs (for
monitoring negative voltages), and also three fan tachometer outputs. There is also one input for case
open detection circuits.
With the application software, the users can read all the monitored parameters of system from time to
time. The application software could be the popular Intel
TM LDCM (LANDesk Client Management) or
Winbond   application software. Also the users can set up the upper and lower limits of these
monitored parameters and to activate two 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 (such as Pentium
TM II) if applicable.
This is to provide the Vcore correction automatically. Also W83781D uniquely provides an optional
feature: early stage (before BIOS was load) beep warning. This is to detect if the fatal elements
present --- VcoreA, +3.3V voltage fail, and the system can not be boomed up.
2.1 Monitoring Items
3 thermal inputs from remote thermistors
5 positive voltage inputs (typical for +12V, +5V, +3.3V, VcoreA, VcoreB)
2 op amps for negative voltage monitoring (typical for -12V, -5V)
3 fan speed monitoring inputs
Case open detection input
WATCHDOG comparison of all monitored values
Programmable hysteresis and setting points for all monitored items
2.2 Actions Enabling
Warning signal pop up in application software
Beep tone warning
Fan ON/OFF control
Issue SMI#, IRQ to activate system protection

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