W83781G

Series: -
Accuracy: ±3°C(Max)
Mounting Type: Surface Mount
Output Fan: Yes
Output Alarm: No
Function: Hardware Monitor
Operating Temperature: 0°C ~ 70°C
Sensor Type: External
Sensing Temperature: External Sensor
Voltage - Supply: 4.5 V ~ 5.5 V
Packaging: Tray
Manufacturer: Nuvoton Technology Corporation of America
Topology: ADC, Fan Speed Counter, Register Bank
Output Type: I²C?, ISA
Package / Case: 48-LQFP
Supplier Device Package: 48-QFP (7x7)


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 I²C^TM serial bus interface
• 5 VID input pins for CPU Vcore identification
• Initial power fault beep (for +3.3V, VcoreA)
• Master reset input to W83781D/G
• Independent power plane of digital Vcc and analog Vcc (input to IC)
• Intel LDCM^TM compatible
• Winbond monitoring application software support
• Input clock rate optional for 24, 48, 14.318 MHz
2.4 Package
• 48-pin LQFP
3. KEY SPECIFICATIONS
• Voltage monitoring accuracy ±1% (Max)
• Monitoring Temperature Range and Accuracy
- 40 to +120 ± 3(Max)
• Supply Voltage 5V
• Supply Current Operating: 1 mA typ.
Shutdown: 10 A typ.
• ADC Resolution 8 Bits


Pinout




Specifications

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
Storage Temperature	-55 to +150

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

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 I2CTM 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 IntelTM 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.

Parameters:

Technical/Catalog Information	W83781G
Vendor	Nuvoton Technology Corporation of America
Category	Integrated Circuits (ICs)
Voltage - Supply	5V
Package / Case	48-LQFP
Packaging	Tray
Output Type	*
Sensing Temperature	*
Lead Free Status	Lead Free
RoHS Status	RoHS Compliant
Other Names	W83781G W83781G