ADT7466ARQZ

Overview

The ADT7466ARQZ is a dBCool remote thermal controller and voltage monitor by onsemi, housed in a 16-lead QSOP package. It features an SMBus 1.1 interface for system communication. The device monitors two analog voltages or thermistor temperatures, plus its own supply voltage. It supports one on-chip and up to two remote temperature sensors with series resistance cancellation. It controls and monitors up to two fans via tachometer inputs and 8-bit DAC outputs. Local sensor accuracy is ±1°C at 20°C–60°C and ±3°C across the full -40°C to +125°C range.

Feature Summary

• Monitors multiple inputs including analog voltages, thermistors, and remote diode temperatures with series resistance cancellation.
• Controls up to two fans using automatic speed control loops optimized for minimum acoustic noise.
• Features enhanced acoustic mode to reduce user perception of fan speed changes.
• Includes thermal protection via PROCHOT input monitoring for Intel Pentium 4 processor performance impact.

Applications

• Low acoustic noise notebook PCs

Procurement Notes

Verify component authenticity through authorized onsemi distributors or certified suppliers. Confirm the specific ordering suffix matches the required package and tape/reel specifications. Check for RoHS compliance documentation relevant to the manufacturing date code. Ensure ESD precautions are observed during handling due to the sensitivity of the CMOS circuitry.

Selection Notes

Select this component for systems requiring active cooling with strict acoustic constraints. It is suitable for applications needing simultaneous monitoring of multiple thermal and voltage points. The integrated SMBus interface simplifies integration with host controllers. Consider the operating temperature range and supply voltage requirements when designing the power delivery network.

Part Context

This part belongs to the ADT7466 family of thermal controllers. It is designed as a complete solution for noise-sensitive environments. The device integrates measurement inputs, limit comparators, and fan drive outputs into a single IC. It replaces discrete monitoring solutions by consolidating functions into a compact QSOP package.

Replacement Considerations

Check for pin-compatible alternatives within the onsemi portfolio that offer updated features or availability. Verify if newer revisions of the ADT7466 series provide improved accuracy or additional monitoring channels. Ensure any substitute maintains compatibility with the existing SMBus address and register map.

FAQ

How does the ADT7466 handle series resistance in remote temperature sensing?

The device includes a series resistance cancellation feature that can compensate for resistance in the traces connecting to remote thermal diodes, up to a maximum of 2 kΩ.

What is the function of the PROCHOT input?

The PROCHOT input allows the ADT7466 to monitor the PROCHOT output of an Intel Pentium 4 processor, enabling it to time and monitor the performance impact of thermal events.

Can the ADT7466 operate without CPU intervention?

Yes, the automatic fan speed control loop links temperature measurement with fan speed control, allowing the system to maintain operating temperatures within limits without continuous CPU involvement.