W83L785R Datasheet, PDF (5/38 Pages) Winbond – WINBOND H/W MONITORING IC FOR NOTEBOOK

W83L785R/W83L785G
1. GENERAL DESCRIPTION
W83L785R/G is a condensed product of W83L784R/G --- Winbond's most popular hardware
monitoring IC for notebook. Specifically designed for the graphic cards and notebook systems,
W83L785R 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.
An 8-bit analog-to-digital converter (ADC) was built inside W83L785R/G. The W83L785R/G can
monitor 4 analog voltage inputs, 2 fan tachometer inputs, 2 remote temperature sensors. The remote
temperature sensing can be performed by thermistors, or connected from Intel^TM Deschutes CPU
thermal diode output. The W83L785R/G provides 2 PWM (pulse width modulation) outputs for the fan
speed control. Also the W83L785R/G provides: SMI#, OVT#, Temp fault, GPIO signals for system
protection events; I²C^TM serial bus interface. W83L785R/G also provides 3 pure GPIO and 8
multifunctional GPIO pins, and powered by 3.3V.
Through the application software or BIOS, the users can read all the monitored parameters of system
from time to time. And a pop-up warning can be also activated when the monitored item was out of the
proper/preset range. The application software could be Winbond's Hardware Doctor^TM, or 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 to activate
one programmable and maskable interrupts. For the spacing saving consideration of the Notebook
system, W83L785R/G is in the package of 209mil 20pins-SSOP.
Publication Release Date: Apr. 2006
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Revision 1.1