W83L785R Datasheet

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W83L785R

WINBOND H/W MONITORING IC FOR NOTEBOOK

1. GENERAL DESCRIPTION

W83L785R is a condensed product of W83L785R --- 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. The W83L785R can monitor 4

analog voltage inputs, 2 fan tachometer inputs, 2 remote temperature sensors. The remote

temperature sensing can be performed by thermistors, or 2N3904 NPN-type transistors, or connected

from Intel

Deschutes CPU thermal diode output. The W83L785R provides 2 PWM (pulse width

modulation) outputs for the fan speed control. Also the W83L785R provides: SMI#, OVT#, Temp

fault, GPIO signals for system protection events; I

serial bus interface. W83L785R also provides

4 pure GPIO and 7 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

, or Intel

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 is in the package of 209mil 20pins-SSOP.

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