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W83781D pdf datasheet (Winbond

消耗积分:3 | 格式:rar | 大小:333 | 2008-12-14

张静

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The W83781D is a hardware status monitoring IC for personal computers, server computers, or microprocessor based systems. W83781D 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. W83781D provides both ISA and I2CTM serial bus interface.A 8-bit analog-to-digital converter (ADC) was built inside W83781D. The W83781D 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 IntelTM LDCM (LANDesk Client Management) or Winbond s 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 PentiumTM 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.
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