W83793G Datasheet, PDF (5/131 Pages) Winbond – Winbond H/W Monitor

W83793G
1. GENERAL DESCRIPTION
W83793G is an evolving version of the W83792D. Besides the conventional functions of W83792D,
W83793G uniquely provides several innovative features such as ASF 2.0 specification compliant,
SMBus 2.0 ARP command compatible, 8 sets of Smart fan^TM. Conventionally, W83793G 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, such as server,
workstation…etc, working very stably and efficiently.
A 10-bit analog-to-digital converter (ADC) is built inside W83793G. W83793G can simultaneously
monitor 11 analog voltage inputs (including power VDD/5VSB/VBAT monitoring), 12 fan tachometer
inputs, 6 remote temperatures, 4 of which support current mode (dual current source) temperature
measurement method, and Watch Dog Timer function. The sense of remote temperature can be
performed by thermistors, or directly from Intel® / AMD^TM CPU with thermal diode output. W83793G
provides 8 PWM (pulse width modulation) / DC fan output modes for smart fan control - S Thermal
Cruise^TM T mode and S Smart Fan^TM II T mode. Under SThermal Cruise^TMT mode, temperatures of
CPU and the system can be maintained within specific programmable ranges under the hardware
control. As Smart Fan^TM II, which provides 8 sets of temperatures point each could control fan’s duty
cycle, depends on this construction, fan could be operated at the lowest possible speed so that the
acoustic noise could be avoided. As for warning mechanism, W83793G provides SMI#, OVT#, IRQ,
BEEP signals for system protection events. W83793G also has 2 specific pins to provide selectable
address setting for application of multiple devices (up to 4 devices) wired through I²C interface.
W83793G can uniquely serve as an ASF sensor to respond to ASF master’s request for the
implementation of network management in OS-absent status. Through W83793G’s compliance with
ASF2.0 sensor specification, network server is able to monitor the environmental status of each client
in OS-absent state by PET (Platform Event Trap) frame values returned from W83793G, such as
temperatures, voltages, fan speed and case open. Moreover, W83793G supports SMBus 2.0 ARP
command to solve the problem of address conflicts by dynamically assigning a new unique address
for W83793G ASF Function after W83793G’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 Doctor^TM or other
management application software. Besides, the users can set up the upper and lower limits (alarm
thresholds) of these monitored parameters and activate corresponding maskable interrupts.
Publication Release Date: Dec. 11, 2006
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Revision 1.0