W83L784R_05 Datasheet, PDF (6/52 Pages) Winbond – Monitoring IC

W83L784R/ W83L784G
1. GENERAL DESCRIPTION
W83L784R/G is an evolving product of W83782D/G --- Winbond's most popular hardware status
monitoring IC. Specifically designed for the Notebook system, W83L784R/G 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 Notebook system to work stably and properly.
An 8-bit analog-to-digital converter (ADC) is built inside W83L784R/G. The W83L784R/G can monitor
4 analog voltage inputs, 2 fan tachometer inputs, one on-chip internal temperature sensor and 2
remote temperature sensors. The remote temperature sensing can be performed by thermistors, or
2N3904 NPN-type transistors, or directly from Intel^TM Deschutes CPU thermal diode output. The
W83L784R/G provides 2 PWM (pulse width modulation) outputs for the fan speed control to support
the S Thermal Cruise^TM T system, which can maintain the CPU or system in the specific programmable
temperature under the hardware control. Another Fan speed control mode is SSpeed CruiseS to keep
the fan operating in the specific RPM. On the other hand, the W83L784R/G provides low active
outputs such as fan fault and Battery low which could issue the hardware warning signals when the
fan speed or battery voltage drop out of the preset range. Also the W83L784R/G provides power good
reset for 3V and 5V; power down mode for power saving; fault pin for necessary H/W shutdown
control; SMI#, OVT#, GPO# signals for system protection events; I²C^TM serial bus interface.
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, W83L784R/G is in the package of 209mil 20pins-SSOP.
2. FEATURES
2.1 Monitoring Items
• 2 thermal inputs from remote thermistors or 2N3904 NPN-type transistors or Pentium^TM II
(Deschutes) thermal diode output
• One on-chip temperature detection
• 4 voltage inputs
--- typical for Vcore, +3.3V, +5V, Battery
• 2 sets of fan speed control and fan speed monitoring input
• WATCHDOG comparison of all monitored values
• Programmable hysteresis and setting points (alarm thresholds) for all monitored items
Publication Release Date: Jan. 2005
-1-
Revision 1.1