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參數資料
型號: W83781D
廠商: WINBOND ELECTRONICS CORP
元件分類: 模擬信號調理
英文描述: MONITORING IC
中文描述: SPECIALTY ANALOG CIRCUIT, PQFP48
封裝: LQFP-48
文件頁數: 6/53頁
文件大?。?/td> 725K
代理商: W83781D
-1-
Publication Release Date : Nov. 1997
Revision 0.60
W83781D
PRELIMINARY
1. 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 I
2
C
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 Intel
TM
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 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
相關PDF資料
PDF描述
W83781 MONITORING IC
W83783 CABLE ASSEMBLY; BNC MALE TO BNC FEMALE BULKHEAD; 50 OHM, RG188-DS COAX, DOUBLE SHIELDED; 48" CABLE LENGTH; ; *USES STANDARD 50 OHM INTERFACE CONNECTORS*
W83783S MONITORING IC
W83787IF WINBOND I/O WITH SERIAL-INFRARED SUPPORT
W83787F WINBOND I/O WITH SERIAL-INFRARED SUPPORT
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