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W83778S, W83778S980, W83781D

Table of contents:
Info of W83778S
Info of W83778S980
Info of W83781D

W83778S, W83778S980, W83781D Selling Leads, Datasheet

MFG:WINBOND Package Cooled:SOP24 D/C:2007+

W83778S, W83778S980, W83781D Datasheet download

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Part Number: W83778S

MFG: WINBOND

Package Cooled: SOP24

D/C: 2007+

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W83781D General Description

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 I2C^TM 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 Winbonds 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.

W83781D Maximum Ratings

PARAMETER	RATING	UNIT
Power Supply Voltage	-0.5 to 7.0	V
Input Voltage	-0.5 to VDD+0.5	V
Operating Temperature	0 to + 70	°C
Storage Temperature	-55 to + 150	°C

Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely affect the life and reliability of the device.

W83781D 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
2.3 General
· ISA and I2CTM serial bus interface
· 5 VID input pins for CPU Vcore identification
· Initial power fault beep (for +3.3V, VcoreA)
· Master reset input to W83781D
· Independent power plane of digital Vcc and analog Vcc (input to IC)
· Intel LDCMTM compatible
· Winbond monitoring application software support
· Input clock rate optional for 24, 48, 14.318 MHz
2.4 Package
· 48-pin LQFP

W83781D Connection Diagram

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