ADT7468ARQ-REEL

Thermal Management Overview

The ADT7468ARQ-REEL is a remote thermal controller and voltage monitor manufactured by onsemi. It features an internal temperature sensor and two remote diode sensors with series resistance cancellation. The device monitors up to five voltages, including VCC, +12V, +5V, +2.5V, and VCCP. It controls up to four fans via PWM outputs and measures fan speed using tachometer inputs. The component operates within a supply voltage range of 3.0 V to 5.5 V and supports SMBus communication at frequencies up to 400 kHz.

Thermal Management Feature Summary

• Integrates automatic fan speed control with dynamic TMIN mode for acoustic optimization
• Supports high and low frequency PWM drive signals for flexible fan management
• Provides bidirectional THERM pin functionality for thermal protection and performance monitoring
• Includes series resistance cancellation on remote channels to improve measurement accuracy

Thermal Management Applications

• Noise-sensitive system cooling applications
• Power-sensitive active system cooling designs
• Intel Pentium 4 processor thermal monitoring
• Server and PC chassis thermal management

Thermal Management Procurement Notes

Verify the specific ordering suffix REEL against the manufacturer's current datasheet to confirm packaging type and availability status. Confirm that the fixed SMBus address 0x2E aligns with system design requirements. Ensure compatibility with existing SMBus controllers regarding electrical specifications and timeout settings before integration.

Thermal Management Selection Notes

Select this component for systems requiring integrated thermal monitoring and multi-fan control without external microcontrollers. Consider the extended temperature measurement range up to 191°C if high-temperature operation is expected. Evaluate the need for series resistance cancellation if long traces connect remote sensors. Verify that the fixed SMBus address does not conflict with other devices on the bus.

Thermal Management Part Context

The ADT7468 is part of the dBCool family from onsemi, designed as an upgrade to the ADT7463. It offers enhanced features such as programmable maximum fan speed, extended temperature range, and series resistance cancellation. The device maintains pin and register map compatibility with previous generations while adding GPIO capabilities and configurable PWM frequencies.

Thermal Management Replacement Considerations

The ADT7463 is a compatible predecessor with similar functionality but lacks series resistance cancellation and extended temperature range. Verify that the ADT7463's default full-speed fan startup meets safety requirements if used as a substitute. Note that the ADT7468 has a fixed SMBus address, whereas the ADT7463 allows address selection.