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W83L786G

H/W Monitoring IC

Winbond 

W83L786R/ W83L786G

1. GENERAL DESCRIPTION

W83L786R/G is an evolving product of W83L785R -- Winbond'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 SMART FANTM control – “Thermal

CruiseTM” mode and “SMART FANTM II “mode. Under “Thermal CruiseTM “mode, temperatures of GPU

and the system can be maintained within specific programmable ranges under the hardware control.

Under “SMART FANTM 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 I2C 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 Winbond's Hardware DoctorTM, IntelTM 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.

Publication Release Date: March 06

-1-

Revision0.8

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