w83l784r Winbond Electronics Corp America, w83l784r Datasheet - Page 6

• Manufacturer Part Number: w83l784r
• Description: Winbond H/w Monitoring Ic
• Manufacturer: Winbond Electronics Corp America

1. GENERAL DESCRIPTION
monitoring IC. Specifically designed for the Notebook system, W83L784R 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.
monitor 4 analog voltage inputs, 2 fan tachometer inputs, one on-chip internal temperature sensor
and 2 remote temperature sensors.
thermistors, or 2N3904 NPN-type transistors, or directly from Intel
output. The W83L784R provides 2 PWM (pulse width modulation) outputs for the fan speed control
to support the
programmable temperature under the hardware control. Another Fan speed control mode is
Cruise
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 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; I
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
Intel
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 is in the package of 209mil 20pins-SSOP.
Confidential, For Beta-site Only
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LDCM (LanDesk Client Management), or other management application software. Also the
W83L784R is an evolving product of W83782D --- Winbond's most popular hardware status
An 8-bit analog-to-digital converter (ADC) was built inside W83L784R. The W83L784R can
to Keep the fan operating in the specific r.p.m.. On the other hand, the W83L784R provides
Through the application software or BIOS, the users can read all the monitored parameters of
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Thermal Cruise
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system, which can maintain the CPU or system in the specific
The remote temperature sensing can be performed by
-5 -
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Deschutes CPU thermal diode
Publication Release Date: Sep.
2
C
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W83L784R
serial bus interface.
Preliminary
Revision 0.54
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Speed
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1999
, or