W83L771G

Overview

The W83L771G is a hardware monitoring IC featuring a 2-channel temperature sensor with an SMBus serial interface. It includes one on-chip thermal sensor and one remote input for external diodes or transistors. The device utilizes a 10-bit plus sign ADC with 0.125°C resolution for remote data and 8-bit format for local data. Operating at 3.3V ±10%, it provides high accuracy of ±1°C for remote and ±3°C for local sensors within specified ranges.

Feature Summary

• Supports SMBus 2.0 protocol with ALERT output modes including comparator, interrupt, and SMBus ALERT.
• Features programmable temperature high/low limits and hysteresis for both ALERT and T_CRIT outputs.
• Includes digital filter levels to suppress erroneous readings caused by noise.
• Provides fault detection capabilities for remote diode disconnection.

Applications

• Notebook computer hardware monitoring
• System ambient temperature sensing
• CPU/GPU thermal diode monitoring

Procurement Notes

Verify the specific suffix 'G' indicates lead-free compliance as per datasheet revision history. Confirm the manufacturer origin, as documentation references Winbond while distributor listings may cite Nuvoton due to corporate acquisition. Ensure the 8-pin TSSOP package matches the target PCB footprint requirements.

Selection Notes

Select this component when a low-power, single-supply temperature monitor is required for systems utilizing SMBus communication. It is suitable for applications needing both local ambient and remote critical component temperature tracking with configurable alarm thresholds.

Part Context

The W83L771G belongs to the W83L771 series of hardware monitoring ICs originally developed by Winbond. This series is designed for compact electronic devices requiring precise thermal management. The G suffix typically denotes a lead-free compliant version of the package compared to the standard W variant.

Replacement Considerations

The W83L771W is the non-lead-free equivalent part number within the same functional family. Verify pin compatibility and register mapping before substitution.

FAQ

What types of sensors can be connected to the remote input?

The remote input (DPLUS/DMINUS) can be connected to thermal diodes, such as CPU/GPU diodes, or bipolar transistors like the 2N3904.

How does the ALERT output function in SMBus ALERT mode?

In SMBus ALERT mode, the ALERT pin pulls low when limits are exceeded. The master resolves the source via Alert Response Address (ARA), causing the device to transmit its address if it generated the alert.