W83L784G

Overview

The W83L784G is a hardware monitoring IC designed for notebook systems. It features an 8-bit ADC to monitor four analog voltage inputs, two fan tachometer inputs, one internal temperature sensor, and two remote thermal sensors. The device supports I2C serial bus interface for register access and provides two PWM outputs for smart fan control. Key specifications include ±1% voltage monitoring accuracy and a temperature range of -40°C to +120°C with ±3°C max accuracy. It operates on a 5V supply with typical operating current of 2 mA.

Feature Summary

• Monitors critical system parameters including power supply voltages, fan speeds, and temperatures for stable notebook operation.
• Provides two PWM outputs for Smart Fan Control to maintain specific CPU temperatures or fan speeds under hardware control.
• Generates hardware warning signals via fault pins when fan speed or battery voltage drops outside preset ranges.
• Supports Intel LDCM and Winbond Hardware Doctor software for parameter reading and alarm threshold configuration.

Applications

• High-end Notebook system hardware monitoring
• Power supply voltage and temperature surveillance
• Fan speed control and fault detection

Procurement Notes

Verify the component status as discontinued. Confirm the package type is 20-pin SSOP (209mil). Ensure compatibility with existing I2C interfaces and BIOS support for legacy management protocols. Check for lead-free packaging availability if required by environmental standards.

Selection Notes

Select this IC for applications requiring dedicated hardware-level monitoring without complex microcontroller overhead. It is suitable for systems needing direct PWM fan control and battery fault alarms. Consider the 5V supply requirement and 8-bit ADC resolution limits for voltage sensing accuracy.

Part Context

The W83L784G is part of the W83L784R/G series, evolving from the W83782D/G. Manufactured by Winbond, it targets the notebook market with a focus on space-saving and reliable hardware status monitoring. It integrates thermal cruise and speed cruise functionalities for automated thermal management.

Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation.

FAQ

What types of remote temperature sensors does the W83L784G support?

It supports remote thermistors, 2N3904 NPN-type transistors, or Pentium II (Deschutes) thermal diode outputs.

How does the W83L784G handle over-voltage inputs exceeding 4.096V?

External resistors must be used to reduce input voltages, such as battery DC, to stay within the 4.096V maximum input range of the 8-bit ADC.