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W83781D Datasheet(PDF) 5 Page - Winbond |
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W83781D Datasheet(HTML) 5 Page - Winbond |
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5 / 54 page  W83781D/W83781G Publication Release Date: April 14, 2005 - 1 - Revision 2.0 1. GENERAL DESCRIPTION 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. FEATURES 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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