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W83L786R/ W83L786G
Publication Release Date: March 06
  - 1 -
Revision0.8
1.   GENERAL DESCRIPTION
W83L786R/G is an evolving product of W83L785R -- Nuvoton's most popular hardware monitoring IC,
and intelligent fan controlling IC. Specifically designed for the graphic cards and barebone / mini
systems, W83L786R/G can be used to monitor several critical hardware parameters of the system,
including voltages, fan speeds, and temperatures, which are very important for the system to work
stably and properly.
 
W83L786R/G provides one set of 5-bit, VRM 9.0 compatible VID that could be used for GPU/CPU
overclocking. By hardware trapping could set up the starting VID value. The W83L786R/G can monitor
up to 5 analog voltage inputs, 2 fan tachometer inputs, and 3 remote temperature sensors. Two of the
temperature inputs could be connected to CPU/GPU thermal diode sensors, and the other remote
temperature sensor could be performed by thermistors. Power-on fan_set configuration offers the
function to choose one of the four duty cycles, 100%, 81%, 62%, 43%, as initial fan speed. 2 sets of
PWM (Pulse Width Modulation) / DC (Direct Current) fan output for S
MART FAN
TM
 control  Thermal
Cruise
TM
 mode and SMART FAN
TM
 II mode. Under Thermal Cruise
TM
 mode, temperatures of GPU
and the system can be maintained within specific programmable ranges under the hardware control.
Under SMART FAN
TM
 II mode, the fan could be operated at the lowest possible speed for minimum
acoustic noise, and the dynamic intelligent fan management could create the most quiet system
environment and stable working performance. An 8-bit analog-to-digital converter (ADC) is built inside
W83L786R/G. As for warning mechanism, W83L786R/G provides four pure hardware event pins for
independent warning signals: VOLTAGE_FAULT#, FAN_FAULT#, TEMP_FAULT#, and INT#. All
threshold values could be set for system protection without any timing delay. One bit power-on
address selection is used to decide the address of the W83L786R/G over I
2
C serial bus interface.
W83L786R/G also provides up to 14 optional multifunctional GPIO. Also, Watch Dog Timer
TM
 could
set up reset time flexibly; facilitate hardware management and monitoring. W83L786R/G is powered
by 3.3V.
 
Through the application software or BIOS, the users can read all the monitored parameters of 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 Nuvoton's Hardware Doctor
TM
, Intel
TM
 LDCM
(LanDesk Client Management), or other management application software. Also the users can set up
the upper and lower limits (alarm thresholds) of these monitored parameters and activate one
programmable interrupts. For the spacing saving consideration of the Graphic cards and Notebook
system, W83L786R/G is 28-pin SSOP package.
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