W83791G

Series: -
Accuracy: ±3°C(Max)
Output Alarm: Yes
Mounting Type: Surface Mount
Output Fan: Yes
Output Type: I²C?
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
Topology: ADC
Manufacturer: Nuvoton Technology Corporation of America
Package / Case: 48-LQFP
Supplier Device Package: 48-LQFP (7x7)


Features:

2.1 Monitoring Items
• 10 voltage inputs
--- Typical for VCORE, +3.3V, +12V, -12V, +5V, -5V, +5VSB, VBAT, and two reserved
• 5 fan speed monitoring inputs
• 3 temperature inputs from remote thermistors, 2N3904 NPN-type transistors or PentiumTM II (Deschutes) thermal diode output
• Case open detection input
• WATCHDOG comparison of all monitored values
• Programmable hysteresis and setting points (alarm thresholds) for all monitored items 2.2 Address Resolution Protocol (ARP) and Alert-Standard Forum (ASF)
• Support System Management Bus (SMBus) version 2.0 specification
• Comply with hardware sensor slave ARP (Address Resolution Protocol)
• Response sensor type ARP command
• Response ASF command --- Get Event Data , Get Event Status
• Comply with ASF sensors (Monitoring fan speed, voltage, temperature, and case open) 2.3 Speech Items
• Programmable speech synthesizer with new high fidelity synthesis algorithm
• Build in 8-bit current D/A converter
• 1 CPU present or absent trigger input
• 5 External trigger inputs
• 128 Internal programmable trigger inputs
• 17 H/W Monitor event trigger inputs
• Programmable 0-255 seconds timeout trigger inputs for firmware or software
• Instruction cycle is <= 400 uS typically
• Section control provided in each voice section
• External resistor for ring oscillator 2.4 Actions Enabling
• Beep tone warning separated speech output
• 5 PWM (pulse width modulation) outputs for fan speed control (1~3 support Smart Fan control) and 5 Fan speed inputs for monitoring --- Total up to 5 sets of fan speed monitoring and controlling
• Issue SMI#, OVT#, IRQ signals to activate system protection
• Warning signal pop-up in application software 2.5 Enhance Monitoring VID function
• CPU Voltage ID reading
• VID output control
• Enhance beep warning by detecting Intel VRM 9.0 VID 2.6 General
• I2CTM serial bus interface
• 5 VID input pins for CPU VCORE identification (for PentiumTM II/III)
• Initial power fault beep (for +3.3V, VCORE)
• 2 pins (A0, A1) to provide selectable address setting for application of multiple devices (up to 4 devices) wired through I2CTM interface Winbond hardware monitoring application software (Hardware DoctorTM ) upport, for both Windows
95/98/2000 and Windows NT 4.0/5.0
• Internal clock Oscillator with 3M Hz
• 5V VSB operation
2.7 Package
• 48-pin LQFP

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 reliability of the device.

Description

W83791D/G is an evolving version of the W83782D/G --- Winbond's most popular hardware status monitoring IC. Besides the conventional functions of W83782D/G, W83791D/G uniquely provides several innovative features such as speech function, ASF sensor compliant, SMBus 2.0 ARP command compatible, VID table selection trapping, and 5VID output control. Conventionally, W83791D/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 stably and efficiently. As for data access, W83791D/G provides slave SMBus 2.0 interface which can reply PEC (Packet Error Code) when as ASF sensor.

An 8-bit analog-to-digital converter (ADC) was built inside W83791D/G. W83791D/G can simultaneously monitor 10 analog voltage inputs (including power VDD/5VSB monitoring), 5 fan tachometer inputs, 3 remote temperatures, and one case open detection signal. The sense of remote temperature can be performed by thermistors, 2N3904 NPN-type transistors, or directly from IntelTM CPU with thermal diode output. W83791D/G provides 3 PWM (pulse width modulation) outputs for two modes of smart fan control-􀁓 Thermal CruiseTM 􀁔 mode and 􀁓Speed Cruise􀁓 mode. Under 􀁓 Thermal CruiseTM 􀁔 mode, temperatures of CPU and the system can be maintained within specific programmable ranges under the hardware control. 􀁓Speed Cruise􀁓, namely, is to keep the fan operate in the specific programmable r.p.m. As for warning mechanism, W83791D/G provides speech voice warning, beep tone warning, and SMI#, OVT#, IRQ signals for system protection events.

Additionally, 5 VID inputs are provided to read the VID of CPU (i.e. PentiumTM II/III) if applicable.

These VID inputs provide the information of Vcore voltage that CPU expects. Furthermore, W83791D/G provides programmable VID output control to alter the voltage CPU consumes.

W83791D/G also uniquely provides an optional feature: early stage (before BIOS was loaded) beep / speech warning to detect if the fatal elements present --- Vcore or +3.3V voltage fail and thus the system can not be boomed up. If the VSB power on setting refers to Intel VRM 9.x, the VID table within W83791D/G will be according to the new one. W83791D/G also has 2 specific pins to provide
selectable address setting for application of multiple devices (up to 4 devices) wired through I²CTM interface.

W83791D/G speech function is enabled by building in a programmable speech synthesizer with a 9-bit current DAC output as well as a connectable external flash memory for storing voice data.

W83791D/G supports 1 CPU present or absent event trap, 5 external event traps, 17 hardware monitor event traps (10 analog voltage, 3 fan tachometer, 3 remote temperature, 1 case open) and 128 internal programmable event traps, amounting to 151 different speech outputs. If more than two events happen simultaneously, the priority set is: SLOTOCC# > EVNTRP1 > EVNTRP2 > EVNTRP3 > EVNTRP4 > EVNTRP5 > 128 Programmable events (Bank0 index 09h) > 17 Hardware status events. Voice data stored in the external flash memory interface with Winbond W55FXX is flexible to change by Winbond application software and on-line programming flash data is provided also. Besides, an external resistor is added to provide ring oscillator.

When you do not use the speech function, W83791D/G provides a set of flexible I/O control functions to the system designer through a set of General Purpose I/O ports. These GPIO ports may serve as simple I/O or may be individually configured to provide a pre-defined alternate function. If pin 9 (SPEECH_SEL) is trapped to high at VSB power on, this function will be active.

W83791D/G can uniquely serve as an ASF sensor to respond to ASF master's request for the implementation of network management in OS-absent state. Through W83791D/G compliance with ASF sensor spec, network server is able to monitor the environmental status of the client in OS-absent state by PET frame values returned from W83791D/G, such as temperatures, voltages, fan speed, and case open. Moreover, W83791D/G supports SMBus 2.0 ARP command to solve the problem of address conflicts by dynamically assigning a new unique address to W83791D/G after W83791D/G's UDID is sent.

Through the application software or BIOS, the users can read all the monitored parameters of the system from time to time. A pop-up warning can also be activated when the monitored item is out of the proper/preset range. The application software could be Winbond's Hardware DoctorTM, IntelTM LDCM (LanDesk Client Management), or other management application software. Besides, the users can set up the upper and lower limits (alarm thresholds) of these monitored parameters and activate one programmable and maskable interrupts. An optional beep tone could be used as a warning signal when the monitored parameters are out of the preset range.

Parameters:

Technical/Catalog Information	W83791G
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	W83791G W83791G